BHT 206A/B-SERIES-MM-11

CHAPTER 97 - AVIONICS
CONTENTS - MAINTENANCE PROCEDURES

Paragraph Chapter/Section Page

Number Title Number Number

AVIONICS

97-1
97-1 Avionics systems .......................................... 97-00-00 3
97-2 Configurations ......................................... 97-00-00 3

INTERCOMMUNICATIONS (ICS) SYSTEM

ICS system ...............................................

-4-4

0090
97-3 97-00-00 11
97-4 Operational checks and troubleshooting - ICS ............ 97-00-00
(1)

97-4 11

COMMUNICATION SYSTEM

VHF communication system ................................ 97-00-00

L!)

97-5 13
97-6
97-6 Operational checks and troubleshooting - VHF COMM .... 97-00-00 13

VHF NAVIGATION SYSTEM

97-7 VHF navigation system .................................... 97-00-00

00
0000
15
97-8
97-8 Operational check and troubleshooting - VHR NAV ........ 97-00-00 15

AUTOMATIC DIRECTION FINDER (ADF) NAVIGATION SYSTEM

ADF navigation ...........................................

(JV
corn
(fl

0)0))
97-9 97-00-00 17
97-10 Operational check and troubleshooting - ADF NAV ........ 97-00-00 17

IDENTIFICATION SYSTEM

97-11
97-11 Identification system ....................................... 97-00-00
0000
0000

19
97-12
97-12 Operational check and troubleshooting - ID system ....... 97-00-00 19

0 0 WIRING DIAGRAMS

97-13 Avionics systems wiring diagrams (helicopters SIN 4 through 2211) 97-00-00
(J,
0

35

WIRING DIAGRAMS

97-14 Avionics systems wiring diagrams

(helicopters S/N 3217 and subsequent) ...................... 97-00-00 47

97-00-00
Page 1
BHT-206A/B-SERIES-M M-11

CONTENTS - MAINTENANCE PROCEDURES (Cont)

z
FIGURES

Figure Page
Number Title Number

Avionics configurations .......................................................

OVA
97-1
97-1 4
Avionics equipment locations ................................................. 7

11cn
97-2
VHF COMM/NAV/ICS (KX-170/KX-170B) - troubleshooting charts ................

33X
97-3 20
97-4
97-4 VHF COMM/NAV/ICS (KX-155 with KMA-24H or
KMA-241-1-71) - troubleshooting charts ........................................ 23
97-5 OMNI (KI-201 C) - troubleshooting charts ...................................... 26
97-6 OMNI (KI-208) - troubleshooting charts ....................................... 27
97-7 ADF (KR-85 and KI-225) - troubleshooting charts .............................. 28
(ca

ADF (KR-87 with KI-227 and KA-4413) - troubleshooting charts ...................

ITV

97-8 29
97-9 Transponder (KT-75R with KFS-575) - troubleshooting charts .................... 31
97-10 Transponder (KT-76/KT-76A) - troubleshooting chart ........................... 32
Transponder (KT-79) - troubleshooting chart ...................................
=CL

97-11
97-11 33
(La

KX-170 VHF COMM/NAV/ICS transceiver with KI-201 C

V-V

97-12
((f

OMNI indicator - wiring diagram .............................................. 36

>-0

97-13 KX-170B VHF COMM/NAV/ICS transceiver with KI-201 C

OMNI indicator - wiring diagram .............................................. 38
97-14 Auxiliary speaker - wiring diagram ........................................... 41
6l>)0

97-15 Auxiliary speaker - wiring diagram ............................................ 42

97-16
97-16 KR-85 ADF with KI-225 indicator- wiring diagram .............................. 43
97-17 KR-85 ADF with KI-225 indicator - wiring diagram .............................. 44
97-18
97-18 KT-75R transponder -wiring diagram ......................................... 45
97-19
97-19 KT-76/KT-76A transponder - wiring diagram ................................... 46
:-c
ANA

97-20
97-20 KX-170B VHF COMM/NAV/ICS transceiver with KI-201 C OMNI
indicator - wiring diagram ................................................... 48
::C

97-21
97-21 KX-155 VHF COMM/NAV/ICS transceiver with KI-208 OMNI
(La
`oX
U'-

°)0

(a>

indicator - wiring diagram ................................................... 51

cn:

97-22
97-22 KX-155 VHF COMM/NAV/ICS transceiver with KI-208 VOR/LOC indicator
(La

- wiring diagram ........................................................... 55

CNN

97-23 KMA-24H ICS audio control panel - wiring diagram .......................... 56

97-24 KMA-24H-71 ICS audio control panel - wiring diagram .......................... 57
97-25
97-25 Auxiliary speaker - wiring diagram ............................................ 58
97-26 KR-85 ADF with separate loop and sense antennas and with KA-42B
loop - wiring diagram ....................................................... 59
KR-87ADF and KI-227 indicator - wiring diagram ...............................
0F-.

97-27
97-27 61
5:3

97-28 KT-76/KT-76A transponder - wiring diagram ................................... 62

97-29 KT-76A transponder - wiring diagram ......................................... 63
97-30
97-30 KT-79 transponder - wiring diagram .......................................... 64

97-00-00
Page 2
 BHT 206A/B-SERIES-MM-11

AVIONICS

97-1. AVIONICS SYSTEMS. omnidirectional range (VOR) and localizer (LOC)

0-0
indications, and provides automatic direction finder
Customer requirements vary so extensively that a basic(ADF) navigation indications. Communication system

3A)
avionics system is not provided. Various systems are equipment provides two-way, VHF voice

Q-0
available in Bell installed kits. These kits are installed communications between helicopter and ground or
when ordered by the customer. Intercommunications, other aircraft. Identification system equipment provides
,-.

navigation, communication, and identification functions identification signals for air traffic control purposes.
(--

are performed by the avionics equipment. Operational

.-«

and maintenance procedures are available from the

various equipment manufacturers. 97-2. CONFIGURATIONS.

Helicopter equipment configurations are dependent on

.-.
Four basic systems exist: intercommunications,

XQ3
(CD
3_.3
E

navigation, communication, and identification. the Bell systems kits installed or customized systems
=_'
Intercommunications system (ICS) equipment provides installed by other equipment manufacturers. Specific kit
communication capability among helicopter configurations and locations are provided in figures
figures97-1
97-1
crewmembers, and between crew and passengers. and 97-2.
97-2 Only available Bell kit configurations are
Navigation system equipment provides VHF covered within each system section.

97-00-00
Page 3
 BHT 206A/B-SERIES-MM-11

1 I 11
r

I 11
i

O 0 0 0 0
0 0 0 0 0 rk

J
m0 K1-201C OMNI INDICATOR
206-706-326-3
206-706-070-17
KT-75 TRANSPONDER
207-706-326-37 -

KI-225 INDICATOR
o° o KX-170/KX-170/B VHF RADIO
206-706-326-29
206-706-070-1/-3

O KR-85 ADF
206-706-326-23
206-706-070-5/-t1

KT-76/KT-76A TRANSPONDER
206-706-326-49/-51
206-706-070-25/-27
D

206A/BS-M-97-1-1

Figure 97-1. Avionics configurations (Sheet 1 of 3)

0)a

00)

97-00-00
Page 4
 BHT 206A/B-SERIES-MM-11

KI-225 ADF INDICATOR

m0 K1-201C OMNI INDICATOR
206-706-070-17

KX-170/B VHF NAV/COMM

RADIO CALL PLATE 206-706-070-1/-3

O KR-85 ADF RECEIVER

206-706-070-5/41 OR
arn0
206-706-070-21/-23
00-

KT-76 OR KT-76A TRANSPONDER

206-706-326-49/-51 OR
206-706-070-25/-27

M S/N 2212 THRU S/N 3216

206A/BS-M-97-1-2

Figure 97-1. Avionics configurations (Sheet 2)

97-00-00
Page 5
 BHTT206A/B-SERIES-MM-11

1 1 I 1

1( 1 i

K1-208 VORIOMNII/LOC
INDICATOR
KI-227 ADF INDICATOR

0 c KMA-24H AUDIO PANEL

OR KMA-24H-71
RADIO CALL PLATE

KX-155 NAV/COMM

00000 O KT-76A TRANSPONDER

KR-87 ADF

a S/N 3217 AND SUBSEQUENT

206A/BS-M-97-1-3

Figure 97-1. Avionics configurations (Sheet 3)

97-00-00
Page 6
 BHT 206A/B-SERIES-MM-11

NOTE
For detailed part number of item on this avionics
equipment location, refer to illustrated parts
catalog.

TB30

M S/N 2212 THRU S/N 3216

206A/BS-M-97-2-1

Figure 97-2. Avionics equipment locations (Sheet 1 of 3)

97-00-00
Page 7
 B HT-206A/B-SERIES-M M-11

SEE VIEW C

2303E1 NOTE
For detailed part number of item on this avionics
equipment location, refer to illustrated parts
catalog.

a S/N 3217 AND SUBSEQUENT

206A/BS-M-97-2-2

Figure 97-2. Avionics equipment locations (Sheet 2)

97-00-00
Page 8
 BHT 206A/B-SERIES-MM-11

For detailed part number of item on

this avionics equipment location,
refer to illustrated parts catalog.

VIEW C

M S/N 3217 AND SUBSEQUENT

206A/BS-M-97-2-3

Figure 97-2. Avionics equipment locations (Sheet 3)

97-00-00
Page 9110
 BHT 206A/B-SERIES-MM-11

INTERCOMMUNICATIONS (ICS) SYSTEM

97-3. ICS SYSTEM. circuitry provisions are available in kits for installation.
ICS components include the KX-170 and KX-170B
Intercommunications system (ICS) equipment provide transceivers or the KMA-24H-52 and KMA-24H-71

ON-(
communications capability among crewmembers and audio panels. Internal relays are installed for use with
between crew and passengers. Additionally, ICS the KX-170 and KX-170B VHF transceivers to provide
equipment provides audio signal control for all avionics audio signal switching control.
systems. Audio outputs to pilot/copilot headsets and
cabin speakers are controlled by an audio panel, if
A-.>

installed, or by avionics equipment volume controls. 97-4. OPERATIONAL CHECKS AND

When not equipped with an audio panel, audio-signal TROUBLESHOOTING - ICS.
switching is provided by internal relays within helicopter
Esc
Q.-
ICS circuitry. Headset and hand-held microphones are Refer to applicable wiring diagrams and troubleshooting
keyed for ICS communication by depressing cyclic-stick charts in this chapter and to applicable equipment
grip switches to the ICS position, or by depressing the manufacturer maintenance manuals for operational
copilot ICS foot switch. ICS system components and checks and troubleshooting procedures.

97-00-00
Page 11/12
 BHT 206A/B-SERIES-MM-11

COMMUNICATION SYSTEM

97-5. VHF COMMUNICATION SYSTEM. 97-6. OPERATIONAL CHECKS AND

TROUBLESHOOTING -- VHF COMM.
Two-way voice communications are available on 720
channels at frequencies ranging from 118.000 to

.--t
Refer to applicable wiring diagrams and troubleshooting
135.975 MHz. VHF transceivers available in kits include charts in this chapter and to applicable equipment
the KX-170/KX-170B and KX-155. Both transceivers manufacturer maintenance manuals for operational
are dual function providing VHF navigation capabilities
.n-.

checks and troubleshooting prodecures.

QUO
as well as voice communications (refer to Navigation
Systems). On the KX-155 transceiver front panel, two
O'-'
.-..
)EN

communications frequencies are displayed on the far

left side: one active and one standby.

97-00-00
Page 13/14
 BHT 206A/B-SERIES-MM-11

VHF NAVIGATION SYSTEM

97-7. VHF NAVIGATION SYSTEM. information. If the KX-155 transceiver is installed, the

QA?
?5'-
KI-208 indicator is used to display course deviation

moo
information. On the KX-155 transceiver front panel, two
"T7

VHF navigation capability provides VHF omnidirectional

v<<
navigation frequencies are displayed on the far right
range (VOR) and localizer (LOC) information to the pilot
side: one active and one standby.

,00
and copilot. Two VHF transceivers are available in

cc))
=-<,=

avionics kits: the KX-170/KX-170B and the KX-155.

These transceivers are dual purpose providing two-way
(1)

97-8. OPERATIONAL CHECK AND

voice communications as well as navigation capability.
TROUBLESHOOTING - VHF NAV.
Both transceivers provide 200 navigation channels at
((D
cc/)

frequencies ranging from 108.00 to 117.95 MHz.

Refer to applicable wiring diagrams and troubleshooting

?-0

vii
charts in this chapter and to applicable equipment
If the KX-170 or KX-170B VHF transceiver is installed, manufacturer maintenance manuals for operational
V=i

the KI-201 C indicator is used to display VOR/LOC checks and troubleshooting procedures.

97-00-00
Page 15/16
 BHT 206A/B-SERIES-MM-11

AUTOMATIC DIRECTION FINDER (ADF) NAVIGATION SYSTEM

97-9. ADF NAVIGATION. bearing indications. If the KR-87 ADF receiver is

installed, the KI-227 ADF indicator is used to display
bearing indications.
ADF navigation capability provides relative bearing to
the selected transmitting station which allows
distance-to-station calculations to be made. Available 97-10. OPERATIONAL CHECK AND
kits provide two ADF receivers: the KR-85 and KR-87. TROUBLESHOOTING - ADF NAV.
These receivers operate in a frequency range from 200

>,o
to 1699 KHz in 1.0 KHz steps. ADF frequency, antenna, Refer to applicable wiring diagrams and troubleshooting
and beat frequency oscillator modes are the three ADF charts in this chapter and to applicable equipment
receiver operational modes. If the KR-85 ADF receiver manufacturer maintenance manuals for operational
is installed, the KI-225 ADF indicator is used to display checks and troubleshooting procedures.

97-00-00
Page 17/18
 BHT 206A/B-SERIES-MM-11

IDENTIFICATION SYSTEM

97-11. IDENTIFICATION SYSTEM. NOTE

FAA designated codes shall only be used for

c0-0
the specific purpose identified:

-0°

(l)
Identification system transponders are designed to fulfill

o°)
0000 and 7777 - never used;

r--
Air Traffic Control Radar Beacon System (ATCRBS)

-00
app
requirements for an airborne beacon. Three 1200 - VFR below 10,000 feet;
transponders are provided for installation in available 1400 - VFR above 10,000 feet;
avionics kits: the KT-75R and the KT-76176A and KT-79. 4000 - restricted or warning area;
A KFS-575 control unit is utilized by the KT-75R 7500 - hijacking;
transponder. These transponders receive interrogation 7600 - lost communications; and

O)0
signals from ground radar at 1030 MHz. A coded 7700 - inflight emergency (MAYDAY).
("a

response is automatically generated to the ground

receiving station at 1090 MHz. Specific pulse

((DD
97.12. OPERATIONAL CHECK AND
"CD

sequences for 4096 preselected codes are assigned to

0.0
helicopters or reserved for specific occasions. These TROUBLESHOOTING - ID SYSTEM.
codes enable the air traffic controller to accurately and
quickly identifythe helicopter. To further assist with rapid Refer to applicable wiring diagrams and troubleshooting
>,-C.-

identification, the air traffic controller may request the charts in this chapter and to applicable equipment
pilot to identify the helicopter. This is accomplished by manufacturer maintenance manuals for operational
coo

depressing the IDENT switch on the transponder panel checks and troubleshooting procedures.
which causes the ATC radar display blip to flash or
"bloom".

97-00-00
Page 19
BHT-206A/B-SERIES-M M-11

Panel lights inoperative Receiver inoperative Pilot microphone

(ICS operative). not operative
(ICS and/or transmit). YES
Replace defective
wiring

Defective
Replace defective wiring from P22.17
lamas Repair or replace
to VR3 (KA-39) Replace pilot
terminal A (input);
defective wirina
7 headset
7
®
YES
Replace defective
relay

z
N NO

Repair or replace Defective

cam
Boa

defective wirina wiring from VR3 YES Replace defective

® Repair or replace
(KA-39) terminal A
(output) to
defective wiring
relay
1
P22.18?

Receiver and pilot/

copilot ICS inoperative
z
NO

YES Replace defective

YES
® Replace KA39 switch
7
Reset or replace
/circuit breaker

NO
z

NO

NO

Defective Replace defective

wiring from ground
to VR3 (KA-39) terminal
Repair or replace
diodes
7
Defective
'wiring from C83 to ` YES
Repair or replace
G (input or
output)? ,
defective wiring
7
P100-2 (KX-170), or K2
defective wiring
,,relay (KX-1108), and,
to P22-20? NO

206A/BS-M-97-3-1

Figure 97-3. VHF COMMMAWICS (KX-170/KX-1708) -troubleshooting charts (Sheet 1 of 3)

97-00.00
Page 20
 BHT-206A/B-SERIES-MM-11

Copilot microphone not operative Speaker (when installed), Left or

(pilot operates normally) Right, inoperative (KX-170B)

YES
Replace defective capacitor

' Defective `
K5 (KX-170) YES
or K2 (KX-170B) Replace defective relay
(copilot microphone) Transmitter will not key from
relay? pilot position

NO

YES
Replace defective diode

Replace copilot headset

NO

Pilot and copilot microphone audio

low in ICS position (KX-170)
YES
Replace defective relay
YES
Replace defective relay

Incorrect R4 YES NO
(audio level control) Increase R4 setting as
potentiometer required
setting Itoo
low)?

I`\
Replace defective panel
YES
Replace defective diode NO

NO

NO Replace defective resistor

Defective
'wiring from P100-8' YES
Repair or replace defective
YES (KX-110) or TB30-4 wiring
[Replace defective switch NO (KX-170B) to -,
,- P22-407

206A/BS-M-97.3-2

Figure 97-3. VHF COMMMAVACS (KX-170/KX-170B) -troubleshooting charts (Sheet 2)

97-00-00
Page 21
 BHT-206A/B-SERIES-MM-11

Transmitter will not key from No audio in either headset from

copilot position navigation and/or communication
receiver

YES
Fm [Replace defective diode Defective
wring from P22-41
to TB30-3 or P22-35 to Repair or replace defective
TB31-1 IKX-1701; or, P22-41 wiring
to R17A or P22.35
to P22-36
NO IKX-110817
M
YES

z
NO
Replace defective relay

Defective
wiring from TB31-1 YES
Repair or replace defective
IKX-1701 or P22.34 wiring
. IKX-170B) to
J41R-27 ,

NO
Replace defective panel

Replace defective headsets

206A/BS-M-97.3-3

Figure 97-3. VHF COMM/NAV/ICS (KX-170/KX-170B) -troubleshooting charts (Sheet 3)

97-00-00
Page 22
 BHT 206A/B-SERIES-MM-11

Audio control panel YES

' Defective
2303CB1 (VHFi)
`
YES YES
or 2301CB2 (ICS PHONE) EE]N Replace circuit Repair wiring
and/or transceiver Repair wiring
panel lights inoperative
EIN circuit breakers?
breaker(s) 7

NO

YES
® Replace lamps
' Faulty wiring `
between TB-6.6 and
YES YES
0' Dirty/faulty
Repair wiring Replace relay wiring/connector(s) YES
2303AIPl-2 and/or Clean/repair wiring/
between 2301CPiP1-3 and
2301 CP1P1-F? connector(s)
,2303TB1-F2/A2 and/or,
NO 2303AiP1-32?

NO
N
YES

z
NO
® Replace dim
switch
Defective
YES connector(s) P/J37 YES Repair/replace
Replace resistor R/L, P/J41 R/L,
and/or faulty
EN connector(s) and/or
repair wiring
Dirty/faulty
wiring/connector(s)
NO
wiring? , between 2303TR1P2-9 and
YES
Clean/repair wiring/
2303TB1-E2/K2 and/or connector(s)
2301CP1P1-9?

No receiver and ICS

z
YES audio present in NO
Replace relay pilot/copilot headset
NO

z
Dirty/faulty
wiring/connector(s) YES
between 2303TR1132.9 and Clean/repair wiring/
NO 2303A1131.32, and/or connector(s)
0' Dirty/faulty
YES 2303TR1P2-K and wiring/connector(s) YES
J41 R/L-4? Clean/repair wiring/
Replace headset between J41R-2 and
2302A1P1-33
Faulty and/or -34?
wiring between YES
ground and 2303A1 Pt-3
and/or 2301
7 NO
CP1P1-E? NO

NO

206A/BS-M-97.4-1

Figure 97-4. VHF COMM/NAVACS (KX-155 with KMA-24H or

KMA-241-1-71) - troubleshooting charts (Sheet 1 of 3)

97-00-00
Page 23
 BHT 206A/B-SERIES-MM-11

Weak or no audio Weak or intermittent Pilot and/or hand

present in speaker(s) audio from COMM or microphone inoperative Defective YES
NAV receiver. in ICS and/or transmit Kt (transmit) relay ® Replace relay(s)
or K2 (pass phone(
relay?

NO
YES
Replace resistor Corroded Replace
antenna connector(s)` micrnohone(s)
0' (COMM or NAV antenna) YES
and/or corroded/defective coax Clean/repair or Defective
connector(s) between 2303E1 and replace connectorls) 2303CB1 (VHF1)
2303TR1J4 or 2303E2 circuit breaker or Replace circuit
and 2303TR1J3? 2301CB2 (ICS PHONE) breakers
NO NO circuit breaker?
W

Dirty/faulty ` NO
Defective YES NO
wiring/connector(s) YES
Clean/repair wiring/ switch (2303S1/S2) Replace switch
between 2301CPlP1-W and on pilot cyclic
connector(s)
2301111 and/or stick?
2301LS12?
YES
Faulty wiring
® Replace antenna or dirty/faulty YES LRIe air wiring or
connectorls)/connection(s) n/repair
N between 2303TR1P2, 2303TB1, ectr(s)/
NO ection(s)
2301CP1P1, and/or
2302A1P1?
z

NO
YES
Dirty/faulty
' wiring/connector(s) YES Replace diodes
Clean/repair wiring/
between 2301LS1/LS2 connector(s)
,and/or 2301R1 and,
ground? Faulty wiring
or dirty/faulty Repair wiring or
' connector(s)/connection(s) YES
clean/repair
between 2302TRiP2, 2303TB1, NO
connector(s)/
2301CP1P1, 2303A1P1, connection(s)
and/or J/P41R. ,

Figure 97-4. VHF COMMMAWICS (KX-155 with KMA-24H or

KMA-241-1-71) -troubleshooting charts (Sheet 2)

97-00-00
Page 24
 BHT-206A/B-SERIES-MM-11

Copilot microphone and/or Cannot take command

foot ICS switch inoperative Defective of COMM function by
2303CB1 (VHF?)
YES / keying pilot microphone
Replace circuit
N or 2301CB2 (ICS EN breaker(s) (transmit or ICS)
PHONE) circuit
breaker?

YES NO
Replace microphone
YES
Replace relay
Faulty wiring
or dirty/faulty YES Repair wiring or
NO
connector(s)/connection(s) ® clean/repair
between 2303TR1P2, 2303TB1, connector(s)/
2301CP1131, and/or connection(s)
2302A1P1?

z
Defective
2303S1/S2 ( cop li ot YES
cyclic stick) switch and/or Replace switch(es)
2303S3 (foot) NO
swit ch? M Dirty/faulty
YES
wiring/ connector(s) Clean or rep l ace
between 2303S1 or S2 wiring/connectors
and 2303AIPI.13
' Dirty/faulty
wiring/ connector(s)
` or -16?
YES
between 2303J/P3-S Clean/repair wiring/
and/or -Y and 2303AIPl-19 connector(s)
and/or -18?

YES
Replace diodes

Defective ` YES
K1 (transmit) relay Replace relay(s)
or K2 (pass phone)
relay?

NO

206A/BS-M-91-43

Figure 97-4. VHF COMM/NAV/ICS (KX-155 with KMA-24H or

KMA-241-1-71) - troubleshooting charts (Sheet 3)

97-00-00
Page 25
 BHT-206A/B-SERIES-MM-11

Panel lights inoperative Indicator completely inoperative Indicator flag inoperative

YES
Replace panel lamps
' Defective
wiring from VR3
` YES
FRerp
wi air or replace defective
terminal B (INPUT) to ing
Repair or replace defective
P45-A (KI-201C), or from wiring
P22-26 to P45-C
(KT-201C)? ,
0

NO
M
NO
YES
Repair or replace defective
wiring Indicator operation is dead
or erratic
YES
Repair or replace defective
wiring

YES
Repair or replace defective
wiring

206A/BS-M-91-5

Figure 97-5. OMNI (KI-201C) -troubleshooting charts

97-00-00
Page 26
 BHT 206A/B-SERIES-MM-11

Indicator flag inoperative Compass card cannot be

Indicator light inoperative
(does not retract) slowed

YES
[Replace light bulb
Defective
wiring and/or
dirty/faulty connector(s)
between 2303DSlP1-4
Repair wiring and/or clean/
repair connector(s)
___j
Replace CDI

and 2303TR1P2-81

YES
DPI

[Repair wiring/connector

[Replace CDI

CDI completely inoperative

Pointer does not move or moves
erratically

Faulty
wiring and/or
' dirty/faulty connector(s)/ ` YES Faulty
connection(s) between Repair wiring and/or clean/ wiring and/or YES
2303DS1P1.8, 2303TB1-D5/H5, repair connector(s)/ dirty/faulty connectorls) FRepair wiring and/or clean/
and/or 2303TR1P2-M1 connectionls) between 2303DSlPl-2 ir connector(s)
and 2303TR1132-H7 .

NO

[Replace CDI

206A/BS-M-91-6

Figure 97-6. OMNI (KI.208) - troubleshooting charts

97-00-00
Page 27
 BHT 206AB-SERIES-MM-11

ADF/Indicator panel ADF/indicator inoperative Indicator does not

lights inoperative with voltage indicated seek the 90 degree
on 28 Vdc bus position in ANT mode

Replace defective
lamps Reset or replace
circuit breaker Repair or replace
defective wiring

No ADF audio output

available from speaker
Repair or replace

!'3
Replace defective system (when installed)
defective wiring
resistor

Defective
wiring from
P49-5 to TB31-1 Repair or replace
Defective \ 1206-706-326-33) or TB30-8 defective wiring
wiring from (206-706-070.5/-11)7
CB3 1206-706-326.33) or Repair or replace
CB2 (206-106.070.5/-11) defective wiring
IADF) circuit breaker
to 1349-4?

Indicator inoperative
(ADF operative
NO through speaker
system in ADF mode)

'Defective'
wiring from
P49-6, -9 and/or Repair or replace
P105-P to A/C defective wiring
ground?
Defective
wiring from
P49-1, -10, -11, -12, -13, Repair or replace
and/or -14 to P105-H, defective wiring
-J, -K, -L, -M,
OR -X?

206A/BS-M-97-7

Figure 97-7. ADF (KR-85 and KI-225) - troubleshooting charts

97-00-00
Page 28
 BHT 206A/B-SERIES-MM-11

Inoperative receiver and/ Pointer does not move or

E
0
or indicator panel lights Pointer does not move to
moves erratically 90 degree position in
ANT mode

YES YES
Replace light bulb(s) Replace receiver YES
Replace receiver

NO

Faulty YES
wiring and/or Replace indicator YES
0" dirty/faulty connector(s) Repair wiring and/or
Replace antenna
connection(s) between TB6.5, clean/repair connector(s)
3406DSlPl-A and/or
3406RE1
connection(s)
7
P2-9?
NO
NO

N
Faulty
wiring and/or Faulty
dirty/faulty connectorlsl wiring and/or
YES 3406RE1P2-A and DS1131-C, Repair wiring and/or dirty/faulty
and/or RE1132.12 and E1131-1, and/or clean/repair connector(s) connector(s)/connection(s) between'
Replace resistor Repair/clean wiring/
RE1P2-F and E1131.5, and/or 3406RE1P2-12 and E1P1-1,
REiP2-9 and
connector(s)/connection(s)
and/or RE1P2-6 and E1P1-4,
ElPl-2? and/or RE1P2-B and
DS1P1-E?

Inoperative receiver
and/or indicator
NO

Open/
dirty ground Refer to troubleshooting

0o0
Faulty
connection(s) between chart for 'Pointer does not
wiring and/or 3406RE1P2-H, and RE1P2-E, and/' Repair/clean wiring/ move or moves erratically'
or WTi-I and DS1P1-H, and/or WT1 connections
dirty/faulty connector(s)
and RE1P2-R, -P, -M, -H, -S,
between 3406CB1(ADF) Clean connector(s). replace or RE1P2 shielding,
circuit breaker and 3406RE1P2-13 clean/repair connector(s) or WT1-H and ,
and/or between connection(s)
ground?
3406RE1P2-D and
3406DS1
P1-B?

206A/BS-M-91-8-1

Figure 97-8. ADF (KR-87 with KI-227 and KA-44B) - troubleshooting charts (Sheet 1 of 2)

97-00-00
Page 29
 B HT-206A/B-SERIES-M M-11

Station audio not present Inaudible or intermittent

or intermittent in headset/ lkhz tone in headset/
speakers speakers with ADF receiver
in BFO mode

YES
Replace audio panel YES
Replace receiver

NO

Excessive static/noise in
headset/speakers
YES
Replace receiver
7

z
NO

z
Defective
grounding of
' wire/connectors shields, ` Repair/replace defective
and/or defective shielding, at shields, and/or properly
YES
and between 3406EiPi,
Replace antenna 3406RE11131 and 132, and
2303CPIP17
ground shields
7

Faulty
wiring and/or
dirty/faulty/
' connector(s)/connection(s) `
between 3406RE1132-10 and Repair/clean wiring/
2303TBi-A1, and/or 2303TB1-F1 connector(s)/connection(s)
and 2303CPIP1-S and/or
3406RElP1 and
, 3406E1131.37 ,

NO

Replace/repair headset/
speakers

206A/BS-M-91-8-2

Figure 97-8. ADF (KR-87 with KI-227 and KA-44B) - troubleshooting charts (Sheet 2)

97-00-00
Page 30
 BHT-206A/B-SERIES-MM-11

Control unit Transponder LO position

lighting inoperative inoperative inoperative

®
YES
Replace defective
lights Reset or replace
circuit breaker
Repair or replace
defective wiring

NO
NO
Improper or inoperative
control unit code
selection.

Repair or replace
defective wiring
Repair or replace
defective wiring Nd

Repair or replace
defective wiring

0
__/
Repair or replace
defective wiring
IDENT light
inoperative

0
YES /
Rspear or replace
=EN detective wiring
Repair or replace
defective wiring

206A/BS-M-97-9

Figure 97.9. Transponder (KT-75R with KFS-575) - troubleshooting charts

97-00.00
Page 31
 BHT-206A/B-SERIES-MM-11

Panel light(s) Intermittent

inoperative 'wiring
Defective
between
transmission
YES
XPNDR circuit breaker
and P96.11 or P131-11 Repair/replace wiring
(KT-76/76A), or
131-11 (KT-76A)?

YES YES
Replace light bulb(s) F =2f transponder

YES
FEN Replace resistor

Defective YES
wiring and/or dirty Replace antenna
defective connector(s)/ Repair/replace wiring/
connectionls) between TB6.5 connectorls)/connectionls)
and P96.11(KT-76), or
NO
P131-3 or Pt-11
(KT-76A)?
N

YES
Transponder
inoperative
FEN Replace antenna
Defective
' duty connector(s) YES
and/or wiring between
NO P97 and P99 (KT-76/76A)
® Clean replace connectorls
or TR1P2 and EtPt
ITP-76A)?

YES
FEN Replace transponder
7 NO

Defective
wiring from YES
ground to P96-12 or
P131-1 (KT-76/76A)
or P1-1/-A
Repair/replace wiring
7
Defective
CB12 (KT-76/76A)
or CB1 (KT-76A)
=N
YES
F Replace circuit breaker (KT-76A)?

(XPNDR) circuit
breaker?

NO

206A/BS-M-91-10

Figure 97-10. Transponder (KT-76/KT-76A) -troubleshooting chart

97-00-00
Page 32
 BHT-206A/B-SERIES-MM-11

Panel light(s) Intermittent/sporadic

inoperative ' Defective transmission
wiring and/or
dirty/defective Repair/replace wiring; clean/replace
connector(s)/connection(s) connector(s)/connection(s)
from CB1
TR1PI.117

YES YES
Replace light bulb(s) Replace transponder
7
YES
NO
M Replace transponder

YES
Defective
wiring and/or dirty/"' Replace antenna
defective connector(s)/ Repair/replace wiring; clean/replace
connection(s) between connector(s)/connection(s)
TB6-5 and
TRiPl-37,

Transponder
inoperative
YES
Repair/replace wiring;
clean/replace connector(s)
N

YES
Replace transponder
7 NO

N Defective
' wiring and/or dirty/ YES
defective connector(s)/
® Repair/replace wiring; clean/replace
connector(s)/connection(s)
connection(s) between,
TR1P1.1/A and
YES ground
Replace circuit breaker

NO

NO
I' Defective `
wiring and/or YES

'L
dirty/defective Repair/replace wiring/shield
connector(s) b etween connection(s); clean/replace
TR1P2 and connector(s)
EiPI? .
==:
206A/BS-M-97-11

Figure 97-11. Transponder (KT-79) -troubleshooting chart

97-00-00
Page 33/34
 BHT-206A/B-SERIES-MM-11

v!, a0 WIRING DIAGRAMS

97-13. AVIONICS JetRanger and 206B JetRanger

--I

('f
SYSTEMS WIRING II (figures 97-12

QQa
figures 97-12
DIAGRAMS (Helicopters SIN 4 through 2211). through 97-19
97-19). Individual circuit diagrams are provided
to assist maintenance personnel in understanding the

.-«
circuits and components installed in the helicopter and

"-'
This section contains wiring diagrams for each of the
gyp) in troubleshooting and tracing of inoperative and

°-N
avionics systems that may be installed in Models 206A malfunctioning circuits and components.

97-00.00
Page 35
BHT-206A/B-SERIES-MM-11

A-25 VHF ANTENNA (REF)

P17
INSTRUMENT CONSOLE

069.101400 COMM/NAV UNIT

KX-170 (MODIFIED)
- - - - - - - - - - - -
TB30 P14 J14

RC646A
T cI COMM ANT
u
P22 J22 N
L - RN51OA22 RC644A22 - 38 LIGHT DIMMER

RC639822 72RC645616 - 20 27.5 VDC

RC640A22 .Ip-- AC643A16N 21 GROUND

RZ78A22 RC642A22 - ID MIKE AUDIO

RZ77A22 RC641A22 - 40 MIKE KEY

V
RC637A22
RC640A22 35 NAV 500 OHM OUT
RZSOA22
RC65OC22 m AUX AUDIO 1
RZ81A22
RC65OB22 37 AUX AUDIO 2
066.3008.02 RZ82A22
(KI.201C) YOR ILS UNIT RC65OD22 AUX AUDIO 3
COPILOT
HEADSET
RC65OE22 U AUX AUDIO 4

27.5 VDC LAMP DIMMER RN509A22 RC65OA22 34 HEADSET AUDIO

BLUE
J RC638A22 41 SPEAKER AUDIO FP-37R J37R

RC637A22 42 SPEAKER GND

PILOT
K RN512A22
HEADSET
ILS ENRGZ P RC634A22 RC634A22 4 ILS ENRGZ
7\2

I
VOR/LOC IN D RC633A22 RC633A22 3 VOR/LOC OUT
I
28 VDC IN A RN508A16 RC632A16 17 j 27.5 VDC SWITCHED

GND

J45
U RN507A22N
V RC631AI6 18 13.75 VDC IN
RZ75A22

VIOLET
22J14 RC655A22N 19
RC639B22
RC652A16 1

RC639C22
RC648A22N - -
I

RC649622N
+28 VDC AT 4A 14 VDC AT 4A RC631A16
P110 J1K1
RC649A22N
+28 VDC AT 1A 14 VDC AT 1A RC652A16 SPKR
RC647A NAV ANT XFMR
RN508A16

RC636AISN
GND GND
O RC635A22N
tn
(REF)

I
INPUT VR3 OUTPUT RC64IA22--C RC651A22
KA-39 VOLTAGE CONVERTER
S TO SHEET 2

L VRP-37 OMNI ANTENNA (REF)

206A/BS-M-97-12.1

Figure 97-12. KX-170 VHF COMM/NAV/ICS transceiver with KI.201 C

OMNI indicator - wiring diagram (Sheet 1 of 2)

97-00.00
Page 36
 BHT 206A/B-SERIES-MM-11

PILOT
COPILOT CYCLIC STICK
CYCLIC STICK
314

CO)
S14 S15

BAD ICS
581 FOOT SWITCH
r I Y
1

0- RZ84A22 - RZ70A22 -®- - RED/BLACK - - T-TV 11 1

0- RZ83A22N
2
RZ71A22
-BLACK ---- °J - RZ72A22 RED/BLACK - - J
RZ73A22 - - BLACK - - - - - -J
RZ84A22

FROM SHEET 1 S

N
N
C4
C-4
C4
C4
a
C4
CM
C.4
C4
C.4

a
<
C4
-C N N N a
N N N U N N
La
rl 40 C4 0 1W
40
=
W
00 00
Q C K 6 Q C C ¢ K

P1oo
10 L 8 5 7 6 d C

J100

R3

206.015.210.1 RELAY PANEL

FROM SHEET 1 S

206A/BS-M-97-12-2

Figure 97-12. KX-170 VHF COMMINAV/1CS transceiver with KI-201 C

OMNI indicator -wiring diagram (Sheet 2)

97-00-00
Page 37
 BHT 206A/B-SERIES-MM-11

RC632AIG

C RC632BIS

RN508A16
28 VDC AT 4A

28 VDC AT 1A
14 VDC AT 4A

14 VDC AT 1A
O
0
RC631A16

RC652AIS
A-25 VHF ANTENNA

r- RC636A16N GND
VR3
GND
0 RC635A16N P17B

CB3
INPUT KA-39 VOLTAGE CONVERTER OUTPUT
RC645B16 RC645A16 --(rA0-- P31A12 28 VDC

RC645C22 RC645D22

066.3008.02
KI.201C VOR ILS UNIT C8
P45
2200/1f, 7VDC
J RN51IA22

C")

)OW
RC638A22
K RN512A22
RC639A22
27 .5 VDC LAMP DIMMER RN 509A22 TB6
RZ172A22
ILS ENERGIZE RC634A22
RC647A RZ81A22 TO SHEET 2
CC))

VOR/LOC IN D RC633 A22

RZ75A22
28 VDC IN RN508A16 1II1- RC648A22N

03)
RZ76A22
GND
.J RN507A22N ---III
RZ82A22

069.1014.00 RZ171A22 J
COMM/NAV UNIT KX-170B (MODIFIED)
P14 TB30 OMNI ANTENNA
206.077-102-1
COMM ANT RC646A

NN
RZ81A22 CR1

P22 CR6 R Z18OA22

LIGHT DIMMER 38 RC644A22 - RZ73A22 RZIBO A 2 2

K1
27.5 VDC 20 RC645BI6 - CR2 RZ IA22 -

RC643A16N ---III RZ72A22 -

1:J

G R OUND 21 R C 178A22

MIKE AUDIO RE] c RC642 A22 CR3 22 -

RZ 171 A

MIK E KEY 40 RC641A22 RC641A 22 - RZ177A22

O
If)

NAV 500 0 OUT 35 RC640A22 CR4 RC654A22 - RZ70A22

AUX AUDIO 1 36 RZ177A22 -

ICS MI C IN 37 c RC 642 B22 CR5 RZ82 A2 2 -
AUX AUDIO 3 15 c RN332B22 RZ71A22 -
cA

N
HEADSET AUDIO 34 RC639A22 RZ76A22

SPEAKER AUD IO 41 RC638A22 - RZ172A22 RZ75A22 - RC6 4 2 B22

I LS ENERG IZE 4 RC634A22 RZ179A22 - RZ179A22

K2

VOR/LOC OUT 3 RC633A22 RN332 A 22 - RC642A22

27. 5 VDC SWITCHED 17 RC632A16 R1 RN332B22 - RC645D22

14 VDC AT 4A INPUT 18 RC631AI6 RN51OA22N ---III CR7

14 VDC AT 1A INPUT i RC652A16

ILS COMMO N 1 9 RC653 A 22N --oil RC654A22

KR-85 ADF P49-5 RZ7OA22 -
P110 RZ178A22 -
TO SHEET 2
RC647A RZ73A22 -
RZ72A22 - 206A/BS-M-97-13-1

Figure 97-13. KX-170B VHF COMM/NAY/ICS transceiver with KI.201C

OMNI indicator - wiring diagram (Sheet 1 of 3)

97-00-00
Page 38
 BHT 206A/B-SERIES-MM-11

n r

v
RZ168822 LS2
J42 P42
LH SPEAKER

N
RZ173A22N I I

RZ171A22 4
II

N
RZ168B22 RZ176B22 1

II HAND MN:

Hui
-1000, LSi
RZ168A22 2
I I I RH SPEAKER A,
RZ170A22N RZ172A22 3

r WIRES STOWED FOR

/ SPEAKER KIT INSTALLATION v
RUA

I 11
I i
ilk}- RZ116A22N
I I II II
u
FROM SHEET 1
RZ162A22N
RC639A22

RZ172A22 J41R P41R

P37R J37R

400
RZ81A22 RC649B22 4

RZ75A22 RC639B22 2

RZ76A22 RZ76A22 3

RZ82A22 RZ81A22 1

RZ171A22

RC649B22

RC639B22
FP-37L J37L
RZ73A22 BLK - - RC649A22N
III
III

PILOT
Ik>- - - - - - - - --- I CYCLIC STICK RC639A22
I

RZ72A22 --®- - - - - RED/BLK - - S14 RZ75A22

RAD
RZ82A22

r RZ178A22 S RZ71B22 V BLK - - S15 R17B 401OW

COPILOT
IIk>- RZ77A22N T CYCLIC STICK - RZ169A22N -^WM
I
RZ70A22 RE D/ BLK - S14 }- R C638A2 2
- RAD
DETAIL A
WIRES TERMINATED AS SHOWN WHEN

70m
SPEAKER ASSY. KIT NOT INSTALLED.
--O

RZ84A22 --0 S87

FOOT
IIk>- RZ83A22N O ICS SW
FROM SHEET 1 2

206A/BS-M-97-13-2

Figure 97.13. KX-170B VHF COMM/NAVACS transceiver with KI-201C

OMNI indicator - wiring diagram (Sheet 2)

97-00-00
Page 39
BHT-206A/B-SERIES-MM-11

COPILOT MIC

M
LO HI

PILOT MIC

LO HI
CB3

18 VDC BUS

CRB

K1

CR1
CR5 E --j
CR4 CR3 CR2

U
RADIO 0 1 0 ICS
PILOT
PRIORITY 514 S15
RELAY PILOT
CYCLIC
STICK

S87
FOOT
ICS SW HAND MIC

HI

TJ
ICS 0 1 0 RADIO

S15 S14
COPILOT
CYCLIC
STICK
KX-1708 VHF
P22

MIC KEY 40 ICS MIC AND KEY

SCHEMATIC DIAGRAM
ICS MIC IN 37

MIC AUDIO

CR7

K2

206A/BS-M-97-13-3

Figure 97-13. KX-170B VHF COMM/NAVACS transceiver with KI-201C

OMNI indicator - wiring diagram (Sheet 3)

97-00-00
Page 40
 BHT 206A/B-SERIES-MM-11

VP228-3
ICS SWITCHING PANEL
OR 206.706.328-7
SWITCH PANEL LS2 &-- RZ16BB22
J101 206-075.593 CABLE ASSY
WINDSHIELD CENTER POST LEFT
PART OF 206.706-326-VHF AND RZ173A22N
NAY AUDIO IN !B2 RC640A22 - - - - - - - - - - - - - - - - - ICS PROVISIONS KIT
F J35
SPEAKER

PHONE OUT El RZ176A22 - RC639B22 - KA-25 ISOLATION AMP

VHF PHONE IN E2 - RZ81A22 -------- - - - - - - - - P35

1
RZ165A22 A +28 VDC
D1 RZ165A22 -4 2 AVIONICS
RZ166A22N D AIRFRAME GND BUS BAR
VHF XMTR KEY D3 - - - RZ82A22 -
X AUDIO GND
J
ICS PHONE OUT C1
RZ162A22 V TRANSMITTER CONT
ICS SPEAKER OUT C3 P41R J41R

F2 RZ50OA22
N RZ161A22 MIKE KEY
G2 RZ501A22
RZ167A22 40 SPEAKER OUTPUT RZ76A22

SPEAKER OUT E3 -RZ78A22----------------- 80.SPEAKER OUTPUT - RC639B22 - - -

D2 206-075-592-1 CABLE ASSY REF
40 SPEAKER LOAD
PART OF 206-706-326-311NSTL
ICS IN C2 4R SPEAKER LOAD
P42 J42

ADF AUDIO IN H2 -RN51OA22 ------------------- L - - RZ77A22 RZ163A22 - - - C 5000INPUT

F 5000INPUT
PANEL LTS Al RZ164A22 TB31
RZ50OA22 K 5000INPUT

- RNSIOA22 - RZ50IA22 M 5000INPUT

TB6
- RC640A22 - 206-075-593-1 CABLE ASSY
N 5000 INPUT
PART OF 206-706.326-1 INSTL
- RZ77A22 - - R 5000 INPUT

KX-170 NAV/COMM - RZ76A22 - - 1 S 5000 INPUT

REF P22 REF RZ169A22N
- - - RZ80A22 - - - N
I I
N N I I

N I

N N
I
N N U 5000 INPUT Ri7

II 42 i - RC637A22 -- 3 - - RZ81A22 - - - -
N
w
(o
1
C4

m
C4

Q
C14

N O Q N
c%j
N 5000 INPUT

HEADSET AUDIO 134 I - RZ82A22 - - - - 0

¢ ¢ W ¢ W 5004 INPUT
¢ ¢ ¢
- RC641A22 - - - - - - - -
i- RC640A22 ----------------
I
MIKE KEY 40
0
1 1 1 1 1 1 1

RZ162A22 J
206-075-599-1
NAV 5000OUTi 35 CABLE ASSY

I
SPEAKER AUDIOi 41 - RC638A22 - - - - - - - - - - - - - -- PILOT CYCLIC STICK REF

TB30
C 3 B _ 5 7 8 - 6 P100
514 S15
206-075-593 CABLE ASSY REF N N z z 7 REF

OUT
AUX AUDIO OUT

m,, XMTR KEY OUT

PHONE OUT
PART OF 206-706-326-1 INSTL REF
TB30 c-A REF REF RZ170A22N J
IO 0 0} w
z 0 0
AUX AUDIO
Q

PHONE
Q
4 RAD ICS
KR-85 ADF O
a O LSt RZ168A22 -
N N Y S 0 0
LU
REF
i P49
Q
'x Q ¢ a a CL

1
L_ _ _J RZ168B22 -
f REI)
a x
- RN332A22 - - J - - RN51OA22 - - - - J
L -------
AUDIO OUT I

L-1-i L ---------
I
PRINTED WIRING BOARD
206.075-210.1 - - BLACK
- RZ72A22 -
HELICOPTERS S/N 4 THRU 913
206A/BS-M-97.14

Figure 97-14. Auxiliary speaker - wiring diagram

97-00-00
Page 41
 BHT 206A/B-SERIES-MM-11

ICS SWITCHING PANEL

206.075-287-1

- RZ176B22 I---------- WINDSHIELD CENTER POST

LS2

LEFT
I0-- RZ16BB22
- RZ176A22 RC639B22 - + RZ173A22N
PHONES SPEAKER
a 2 206-075.593 CABLE ASSY
day

J35
ADF

a OFF - - - RN51OA22 - - -, PART OF 206-706-326-27 INSTL

SPEAKER KA-25 ISOLATION AMP
- RZ78A22 - -
S101
U
II
1

RZ165A22
P35

7A +28 VDC
RZ165A22 --0 2
.11
CB11
AVIONICS
RZ166A22N D AIRFRAME GND BUS BAR
cu.

PHONES lf+
OFF - 2
NAV
AVN

- RC640A22-
=,n

X AUDIO GND
z SPEAKER
1

1 S102
RZ501A22 RZ162A22 V TRANSMITTER CONT
P41R J41R

L+-----I-------
RZ176C22 REF REF
S103
34 --L----L-J RZ161A22 H MIKE KEY
2 PHONES 2

--- --n-
o OFF -+ RZ81A22 - II RZ167A22 B 40 SPEAKER OUTPUT RZ76A22
SPEAKER I II
RZ82A22 80 SPEAKER OUTPUT - RZ6391322 - - -
1
I

RZ50OA22 206-075-592-1 CABLE ASSY REF

40 SPEAKER LOAD
PANEL PART OF 206-706-326-31 INSTL REF
LTS RZ164A22 L 40SPEAKER LOAD
11
L-------------
DS101 P42 F J42
RZ502A22 L - - RZ77A22 RZ163A22 - C 5000INPUT

F 5000INPUT
T831
RZ50OA22 K 5000 INPUT
TB6
- RN51OA22 - RZ50IA22 M 5000 INPUT
206.075-593-1 CABLE ASSY
- RC640A22 - N 5000 INPUT
PART OF 206-706-326-1 INSTL
- RZ77A22 - - R 5000 INPUT
I I

KX-170 NAY/COMM - RC78A22 - - S 500 0 INPUT

REF P22 REF RZ169A22N
1 - RZ80A22 - - - I
500 4 INPUT
L-------J

N U
N
N N

RZ77A22

RZ81A22
J a a 040 4

a
N2 1 - RC637A22 - RZ81A22 - - - - N N
a PN
1

5000INPUT
f0
- RZ82A22 - - - -
'D
U U U¢ 1

W
m

HEADSET AUDIO 134 cc 5000INPUT

- RC641A22 - - - - - - - - -® - RZ162A22
NAV
MIKE KEY 140

5000OUTi35i-RC640A22-------------------
I

IIIIII
1

1111111
1 1 1 1 1 1

J
206-075-599-1
CABLE ASSY
SPEAKER AUDIO i41F--RC638A22 --------------- I -I- 1. L -I- J PILOT CYCLIC STICK REF
T630 C 3 B 5 7 8 6 P100 -----7-1
206.075-593 CABLE ASSY REF N N z z REF sta S15
XMTR KEY OUT

PHONE OUT
I I
PART OF 206-706.326-1 INSTL REF F TB30
a a ICS
PHONE
I RAD I
LS1

PHONE
KR-85 ADF
le
Z Z
REF
arn
a a 1
P49 RED/BLK
J
I
I
AUDIO OUT I - RN332A22 - - -1
L-,J
- RN51OA22- - - I
L - 206.075-210-1
PRINTED WIRING BOARD J
BLACK J
- RZ72A22 -
HELICOPTERS S/N 914 THRU 2211
L ------- 206A/BS-M-91-15

Figure 97-15. Auxiliary speaker - wiring diagram

97-00-00
Page 42
 BHT 206A/B-SERIES-MM-11

SENSE ANTENNA (REF)

J50

P56 C83
i
RN 344 A 22 1,5 2 8 VDC 1

ADF
a
a
1

N OVERHEAD CONSOLE
M
Z

KR-85 AUTOMATIC
K1.225 INDICATOR DIRECTION FINDER
P105 P49
J105 J49
RN346A RN346A
FTB30 2

F R40

z
RN332A22
I

RN344A22 RN331A22 4 14 VDC IN

TB31

z
RN332A22 5
AUDIO OUT
r- RN333A22

z
F TB6

z
PANEL LIGHTS RN342A22 RN334A22 PANEL LIGHTS
I

90° SWITCH RN335A22 RN335A22 8 14 VDC TO 90`SWITCH

GND P RN343A22N 1IPZ RN336A22N 9 GND HELICOPTERS S/N 4 THRU 1563

9 VDC IN RN337A22 RN337A22 10 9 VDC OUT (IF INSTALLED)
t10

z
14 VDC IN RN338A22 RN338A22 11 14 VDC OUT

SERVO OSC M RN339A22

.N-
RN339A22 12 SERVO OSC

SERVO OSC

z
K RN340A22 RN340A22- 13 SERVO OSC

SERVO AMP RN341A22 RN341A22 14 SERVO AMP OUTPUT P52 FPJ5271 J52

P51 P102 15
J48 P48
L RN324A JB1 RN345A SENSE ANT
BLUE -

GREEN
LOOP
ANTENNA
3 RED -
LOOP ANTENNA (REF)
4 WHITE

INSTRUMENT CONSOLE

206A/BS-M-91.16

Figure 97-16. KR-85 ADF with KI-225 indicator - wiring diagram

97-00.00
Page 43
 BHT 206A/B-SERIES-MM-11

F-
F7TB30

RN332A22 J RN344A22 --cl,5b- P31B12

ADF
28 VDC I
I

RN51OA22N KR-85 AUTOMATIC OVERHEAD CONSOLE

K1-225 INDICATOR DIRECTION FINDER
P105 P49
J105
RN346A RN346A

R40

RN344A22 -N1ti RN331A22 - 4 14 VDC IN

TB6

111
RN332A22-
AUDIO OUT
I
PANEL LIGHTS RN342A22 RN333A22N
I

PANEL LIGHTS

z
RN334A22-

90° SWITCH RN335A22 RN335A22- 14 VDC TO 90 SWITCH

1

zz
GND RN343A22N ---III I RN336A22N GND

9 VDC IN RN337A22 RN337A22 10 9 VDC OUT

14 VDC IN RN338A22 RN338A22- 11 14 VDC OUT

SERVO OSC M RN339A22 RN339A22 12 SERVO OSC

SERVO OSC K RN340A22 RN340A22- 13 SERVO OSC

SERVO AMP
U RN341A22

F P51 J51
RN341A22 14

15
SERVO AMP OUTPUT
HELICOPTERS S/N 1564 THRU 2211
J48 F P48
li

(IF INSTALLED)
RN324A RN345A 16 SENSE ANT
7) BLUE -

LOOP GREEN

ANTENNA RED -
WHITE

111
P52 FPJ52 J52
INSTRUMENT CONSOLE

RN324A
P50 J50

- WHITE

BLUE
6

111
5 LOOP ANTENNA

GREEN

KA-17 SENSE ANTENNA 2

RED
206A/BS-M-97-17

Figure 97-17. KR-85 ADF with KI-225 indicator - wiring diagram

97.00-00
Page 44
 BHT 206A/B-SERIES-MM-11

Duo
(KT-75RI
066-1020-03 TRANSPONDER
P96
J96 INSTRUMENT CONSOLE
28 VDC I11 SX56A22-'
WINDSHIELD CENTER POST SX57C22N - (KFS-515) I
GROUND 2 SX55A22N

°W°
071-1038-03 CONTROL UNIT I
TB6
SX57D22N
I
F P95 J95

SX57B22N 1 SX53A22 --Z 24 LIGHTING

I

r
I

OVERHEAD CONSOLE - 16 SX52A22 2 Al

17 SX51A22 3 A2
CB12 I

18
I
SX50A22 4 A4

O))
19 SX49A22 5 B1
I
I
20 SX48A22 6 B2
1

21 SX47A22 7 B4
I
22 SX46A22 8 Cl
I

23 SX45A22 x 9 C2
I

14 SX44A22 10 C4 i
25 I
SX43A22 11 DI
I

26 SX42A22 12 D2

27 SX41A22 13 D4
i
I

P97 J97 28 SX40A22

I
14 CONTROL HEAD COMMON

C ANTENNA 29

30
SX39A22 15 ON/OFF i
1
SX38A22 16 ON/OFF 1

SX37A22

z
31 17 A INHIBIT

32 SX36A22 18 C INHIBIT I

33 0 1

O))
SX35A22 19 LO SENSE

34 SX34A22 20 IDENT
1
C.)

35 SX33A22 21 L1
I

36 SX32A22 22 L2

SX31A22 23 L3 I

I
SX57B22N - [ - SX58A22N SX58D22N

SX58B22N I
SX57A22N - 1

[ - SX58C22N
HELICOPTERS S/N 4 THRU 1563
(IF INSTALLED) 206A/BS-M-91-18

Figure 97-18. KT-75R transponder - wiring diagram

97.00-00
Page 45
BHT 206A/B-SERIES-MM-11

FCB12

<<_
AVIONICS
KT76.4A22 --d 5"t>-- P31C12 28 VDC BUS

WINDSHIELD CENTERPOST

KT-76 TRANSPONDER
P96
TB6
r- KT76-IA22 12 GROUND
R41
PANEL LIGHTS
Ud
120 KT76.2A22 11

01-
50W
KT76.3A22 13.75 VDC

P97

z
ANTENNA P97

KT-76 TRANSPONDER KIT 206-706-326-049 AND -051

CBi2
AVIONICS
XPNDR-2A22 --.5--- P31C12 28 VDC BUS

WINDSHIELD CENTERPOST

KT-76A TRANSPONDER
LP131

R58
TB6
r- XPNDR-5A22N --n GROUND

120 XPNDR-4A22 -1 3 PANEL LIGHTS

50W
XPNDR-3A22 11 13.75 VDC

P97

C ANTENNA P97

KT-76A TRANSPONDER KIT 206.706-070-025 AND -027

206A/BS-M-97-19

Figure 97-19. KT-76/KT-76A transponder - wiring diagram

97-00-00
Page 46
 BHT 206AIB-SERIES-MM-11

WIRING DIAGRAMS

97-14.AVIONICS SYSTEMS WIRING are installed in the Model 206B JetRanger III,
helicopters SIN 3217 and subsequent. Circuit diagrams

a_,
and
ICI

DIAGRAMS (Helicopters SIN 3217

subsequent). are provided to assist maintenance personnel in
understanding operation of circuits and components,
and in troubleshooting malfunctions. These diagrams

(3n
This section contains wiring diagrams (figures
figures 97-20
97-20 are indexed to coincide as nearly as possible with text
through 97-30
97-30) for each of the avionics systems which and troubleshooting charts.
'-F

97-00-00
Page 47
 BHT-206A/B-SERIES-MM-11

C RC632AIG
A25 VHF ANTENNA
28 VDC AT 4A 14 VDC AT 4A
a RC631A16 -

O 28 VDC AT 1A 14 VDC AT 1A
0 RC652A16 -

: a
GND GND RC635A16N

YA3 P17B
INPUT KA-39 VOLTAGE CONVERTER OUTPUT
F CB3 -1 VHF 1

066.3008.02
KI.201C VOR ILS UNIT
P45
Y CB
RC646A
RC645B16 RC645A16 --e5A'O- P31A12 28 VDC

2200/a 7 VDC RC645C22 RC645D22

J RN51IA22

RN512A22
F
RC638A22
27 . 5 VDC LAMP D I MMER RN509A22
TB6 RC639A22 (BLU) -
ILS ENERGIZE P RC634A22
RC639A22 (WHT) -
/
t+)

VO R LOC IN RC633A22
RZ172A22

N
14 VDC IN C RC655A22
TO SHEET 2

NN
RC647A RZ81A22
GND RN507A22 N --III
rti RZ75A22
11ID - RC648A22N
069.1014.00 RZ76A22
COMM/NAY UNIT KX-1708 IMODIFIEDI
P14 RZ82A22

COMM ANT RC646A RZ171A22

TB30
P22 206.077.102.1
OMNI ANTENNA
LIG HT DIMME R 38 RC644A22 - RZ81A22 CR1

27.5 VDC 20 RC645B16 - RZ180A22

NN
GROUND 21 RC643A 1 6N --- <111 AZ73A22 RZIBOA22 K1

MIKE AUDIO m c RC642A22 - RZ71A22-

ICS CONT
22 - O
RELAY
m

MIKE KEY 40 RC641 A AZ72A22 RC178A22

NAV 5000 OUT RC640A22 RZ171A22

A UX AUDI O 1 BE RC6 41A 22 RZ177A22

C S MIC IN
I 37 c RC642B22 RC654A22 RZ70A22
t')

AUX AUDIO 3 15 RN 332 B22 RZ 17 7A2 2

RC639 A 22 ( BLU) RZ82 A 22

HEADSET AUDIO 34 RC639A22 (WHTI R Z 71A 2 2

S P E AKER AUDIO 41 RC638A22 RZ76A22 -

14 VDC OUT FE RC6 4 2B22

full
R C65 5A22 RZ75A22
K2
ILS ENERGIZE RC634A22 RZ 1 7 9A22 RZ179A22
ICS CONT
VOR/LOC OUT 3 RC633A22 RN332A22 R C6 42A22
RELAY
27.5 VDC SWITCHED
^J.

17 RC632A16 RN332B22 RC645D22

14 VDC AT 4A INPUT ID RC631A16 RN51OA22N {ip CR7

14 VDC AT 1A INPUT 1 R C652 A16

ILS COMMON 19 RC653A22N -1111 RC654A22

KR-85 ADF P49.5 f RZ70A22
RC65GA22N III
P110

RC647A
RZ178A22

RZ73A22
} TO SHEET 2

RZ72A22 206A/BS-M-97.20-1

Figure 97-20. KX-170B VHF COMMMAVACS transceiver with KI.201C OMNI

indicator - wiring diagram (Sheet 1 of 3)

97.00-00
Page 48
 BHT 206AM-SERIES-MM-11

A
RZ168B22

RZ173A22N

R718RR22
( ( I

V
LS2
LH SPEAKER
RZ171A22

RZn6B22
T
J42

I
P42

-------
HAND MAC
RZ168A22 LSi 2
T\
RZ170A22N
I ( I RH SPEAKER
RZn2A22 0 3
J
WIRES STOWED FOR
SPEAKER KIT INSTALLATION V
-n RnA
RZ169A22N I 0 II
RZ116A22N

SEE VIEW A
u
- RC638A22 -
FROM SHEET 1
- RC639A22 (BLU)
110 - RZ162A22N
- RC639A22 (WHT)
- RZ172A22 - J41R P41R
P37R J37R
P
- RZ81A22 - RCS39822 (BLU) 4

- RZ75A22 - RC639B22 (WHT) 2

- RZ76A22 - AZ76A22

- RZ82A22 -

N
RZ81A22 1

- RZ171A22 -

RC639B22 IBLUI

RC639B22 (WHTI
P37L J37L
RZ73A22 BLK - -
III RC639A22 :BLU)

Ip- - I
PILOT
CYCLIC STICK RC639A22 WHT)
I
RZ72A22 RED/BLK -- J S14 RZ75A22
_RAD RZ82A22

r RZ17BA22 g- RZ71B22 V BLK-- S15

III

FR-17B 4 010W
COPILOT
ICS
III>-- RZ77A22N T I CYCLIC STICK 1j- AZ169A22N
I
- RZ70A22 RED/BLK - s1a RC638A22
-RAD
VIEW A
WIRES TERMINATED AS SHOWN WHEN
SPEAKER KIT NOT INSTALLED.

- RZ784A22 O S87

III>- RZ83A22N - 2FOOT

ICS SW
FROM SHEET 1

206A/BS-M-91.10-2

Figure 97.20. KX-170B VHF COMM/NAVACS transceiver with KI-201 C OMNI

indicator - wiring diagram (Sheet 2)

97-00.00
Page 49
BHT-206A/B-SERIES-MM-11

COPILOT MIC

LO HI

PILOT MIC

M
LO HI

CB3

5A 28 VDC BUS

CRB

K1

CR5 CR4 EC -R3 CR2

CR1

0
RADIO ICS

map
PILOT

a-0
PRIORITY S14 S15
RELAY PILOT
CYCLIC
STICK I

0
S87
FOOT
L
ICS SW HAND MIC

TJ

ICS 0 1 0 RADIO

S15 S14
COPILOT
CYCLIC
STICK
VHF
P22

MK; KEY 40

ICS MIC IN 37

PAC AUDIO

CR7

K2

206A/BS-M-97-20-3

Figure 97-20. KX-170B VHF COMM/NAVACS transceiver with KI-201 C OMNI

indicator - wiring diagram (Sheet 3)

97-00-00
Page 50
 BHT-206A/B-SERIES-MM-11

2303Ai 2303CB1
2303A1P1 FTB67]
AUDIO ISOLATION CIRCUIT VHF 1

28 VDC POWER 1 VHF-18622 5 28 VDC BUS 2303,13 2303P3 RADV--9_I.

28 VDC DIMMER BUS 2 VHF-24A22 VHF-41622N

COPILOT RADIO PTT 19 VHF-22A22 VHF-22A22

COPILOT ICS PTT 18 VHF-23A22 VHF-23B22

COPILOT CYCLIC
STICK DISC
AFT ICS MIC HI IN 21

AFT ICS MIC HI ATTEN 20

2303S3 2303WT1
AFT ICS MIC HI OUT 22 S COPILOT FOOT
01 ICS SWITCH TO SHEET 2 2303DSlPl-1
ANNUNCIATOR LIGHT CONTROL S

2303S1 2303S2 VHF-41622N

AFT ICS PTT 36 S
PILOT RADIO PILOT ICS VHF-23822 VHF-41A22N
AFT HEADSET HI PTT SWITCH PTT SWITCH

.w.
31
VHF-23A22 TO SHEET 2

VHF-44A20N
2303A1P1
PILOT RADIO PTT 13 VHF-36A22 -®

AFT CENTER ICS MIC HI PILOT ICS PTT 16 VHF-37A22 - J41R P41R
PILOT
HEADSET
AFT CENTER ICS MIC HI PILOT MIC HI 11 VHF-30A24 WHT P37R J37R
I II

AFT LH ICS MIC HI PILOT MIC LO 14 VHF-30A24 BLU

P
9 AFT LH ICS MIC HI PILOT HEADSET HI 34 VHF-31A24 WHT
I-I
II I I

28 SPARE VHF-31A24 BLU

15 AFT CENTER ICS PTT f- VHF-35A24 BLU - VHF-38A22N

FJ41L P41L
COPILOT
37 AFT LH ICS PTT HEADSET
-, p
COPILOT MIC HI 23 VHF-34A24 WHT FP37L J37L

COPILOT MIC LO 17 VHF-34A24 BLU

I:P
COPILOT HEADSET HI 33 VHF-35A24 WHT 2
II
I I

29 AFT LH HEADSET HI VHF-35A24 BLU

30 AFT CENTER HEADSET HI VHF-40A22N

2303,12 2303P2
35 CABIN AUX AUDIO IN
HAND MIC PTT 26 VHF-33A24 BLU
ii
HAND MIC HI 24 VHF-33A24 WHT

S55
TO SHEET 2 2303TB3-D3

INSTRUMENT LIGHT POWER VHF-26A22

GROUND VHF-25A22N
f- VHF-39822N
I J 206A/BS-M-91-21.1

Figure 97-21. KX-155 VHF COMM/NAVACS transceiver with KI-208 OMNI

indicator - wiring diagram (Sheet 1 of 4)

97-00.00
Page 51
 BHT 206AB-SERIES-MM-11

2303TR1
2303T81
2303A1 65 NAV COMM
T---
i -

Lei
AUDIO ISOLATION CIRCUIT KX-155
2303A1P1 Al 0-11-0 F1 2303TR1P2
i
J2
TRANSMITTER MIC HI OUT 25 47- VHF-28A24 - - VHF-28A24 BI O--0 G1 VHF-7A22 - IJI COMM IF AGC
i i
i
TRANSMITTER PTT 27 4" VHF-42A22 - - VHF-42A22 C1 0-i H1 VHF-8A22 - 1 SQUELCH TEST/COMPRESSOR
i i

COPILOT ICS MIC HI OUT 10 N VHF-27A24 - - VHF-27A24 J1

i
VHF-161320 - C OBI DATA
i
PILOT ICS MIC HI OUT VHF-29A24 - - VHF-29A24 E10+0 Kt OBI CLOCK

1N0
12 VHF-16C20 E
i
i
VHF-32A24 BLU VHF-32A24 BLU 1 4 OBI SYNC

HEADSET HI IN 32 rill, VHF-32A24 WHT VHF-32A24 WHT A20-11-0 F2 -VHF-9A22 7 NAY IF AGC
--_j 1 i
V - VHF-15A24 1-1 B2 0+0 G2 r'-VHF-8A22 F RNAV REQUEST
FROM SHEET 1 -j i i
2303TR1 - VHF-14A24 C20--0 H2 rVHF-7A22 A RNAV MODE
i
NAV COMM KX-155

COMM MIC KEY

n2303TRlPl

VHF-15A24 J
VHF-13A24 WHT

VHF-12A24 WHT -P
D2 0-i -0 J2
i
E2 0+0 K2 VHF-9A22 3
5 DME DATA

DME CLOCK

-------------
rL
COMM MIC AUDIO HI VHF-14A24 - VHF-13A24 BLU A3 F3 D DME SELECT

NAY AUDIO OUT 10 VHF-13A24 WHT VHF-12A24 BLU

rr B3
i

i G3 14 NAY REMOTE TRANSFER

NAY AUDIO RETURN L

4
VHF-13A24 BLU - VHF-43A22 - C3
i

H3 2303C61
VHF 1
R COMM REMOTE TRANSFER

COMM AUDIO OUT VHF-12A24 WHT D3 J3 16 AUX INPUT 2 (ADF)

i
i 5
COMM AUDIO RETURN VHF-12A24 BLU VHF-6A22N E3 K3 G AUX INPUT 1 (NAV)
28 VDC
MIC INTERCOM HI VHF-16A20 - VHF-16A20 A4 E4 BUS

POWER GROUND S VHF-201316N - B4 F4 - VHF-181316 13 28 VDC POWER IN

POWER GROUND 15 VHF-20C16N - C4 G4 - VHF-18C16 P 28 VDC POWER IN

NAV COMPOSITE OUTPUT H VHF-17A24 - D4 H4

ILS VHF-1A24 - 2303WT1 A5 E5 VHF-19A16 VHF-19A16 12 SWITCHED POWER OUT

h`J
VHF-21A22N - K C-A VHF-19B16 VHF-19616 SWITCHED POWER OUT

C71
B5 F5 N

2303DS1 C5 G5 VHF-19C16 VHF-19C16 11 SWITCHED POWER IN

2303DS1P1
KI-208 INDICATOR
2303DSIPI VHF-19E20 - VHF-19D16 VHF-19D16 M SWITCHED POWER IN

11 TO 33 VDC POWER INPUT M8 VHF-19E20 VHF-20A16N A6 E6

SPARE ILS ENERGIZE VHF-1A24 VHF-20B 16N B6 F6 2303TR1P4 J4

NAY COMPOSITE INPUT VHF-17A24 YHF-20C16N C6 G6 VHF-100A COMM ANTENNA

12 SPARE SPARE 2303WT1 Q D6 H6 2303E1P1

GROUND VHF-11A20N A

11 + RIGHT DEFLECTION SPARE D TB6

2303E1
10 + LEFT DEFLECTION COMM ANTENNA ti
28 VDC LIGHTS HI VHF-IOA22
rv
ti 206ABS-M-97-21-2

Figure 97-21. KX-155 VHF COMM/NAVflCS transceiver with KI-208 OMNI

indicator - wiring diagram (Sheet 2)

97.00.00
Page 52
 BHT 206A/B-SERIES-MM-11

CR10
2303A1
PILOT OVERRIDE RELAY 2303A1P1
AUDIO ISOLATION CIRCUIT

COPILOT RADIO PTT -

COPILOT MIC LO - 17

1 CR9 PILOT RADIO PTT - 13

COPILOT ICS PTT - 18

I
I
CR8 TRANSMITTER PTT - 27

CR12 CR11 HAND MIC PTT 26

CR13

PILOT MK: LO 14

CR14 PILOT ICS PTT 16

K4
CR5 W

NOW
ANNUNCIATOR RELAY AFT CENTER ICS MIC HI 1

CR15 AFT CENTER ICS MIC HI

A 28 VDC DIMMER BUS

CR6 AFT LH ICS MAC HI - 9

AFT LH ICS MIC HI

GROUND

INSTRUMENT LIGHT POWER -

28 VDC POWER

TRANSMIT RELAY CABIN AUX AUDIO IN 35

COPILOT ICS MIC HI OUT - 10

COPILOT MIC HI 23
A TRANSMITTER PAC HI OUT - 25

PILOT ICS MIC HI OUT - 12

PILOT MIC HI 11

L HAND MIC HI 24

CR7 ANNUNCIATOR LIGHT CONTROL 4

-N+
AFT MIC ICS HI IN 21

AFT ICS PTT 36

K2
AFT ICS MIC HI ATTENUATED

(N0
PASS PHONE RELAY 20

O AFT ICS MIC HI OUT 22

AFT HEADSET HI 31

HEADSET HI IN 32

CR18 AFT LH HEADSET HI 29

AFT CENTER HEADSET HI - 30

CR19
CR11 PILOT HEADSET HI 34

AFT LH ICS PTT 37

CR16 COPILOT HEADSET HI 33

AFT CENTER ICS PTT 15

206A/BS-M-91.21-3

Figure 97-21. KX-155 VHF COMM/NAVACS transceiver with KI-208 OMNI

indicator - wiring diagram (Sheet 3)

97-00.00
Page 53
BHT-206A/B-SERIES-MM-11

2303TR1
NAV COMM
KX-155
2303TR1P1 2303TR1P1
J1 J1
IRI SPARE SWITCHED POWER 31
B SPARE SWITCHED POWER E

D SPARE PTT C

G SPARE INTERCOM MIC HI 9

NOTES
NAV AUDIO LOW
SPARE 6
A Refer to auxiliary speaker wiring diagram.

z
J SPARE NAV AUDIO H

8 SPARE COMM AUDIO LOW 5 A Refer to ADF system wiring diagram.

10
SPARE

SPARE
COMM AUDIO

AUX AUDIO
2

4
A When KMA 24H audio control kit is not installed,
these pins are used in intercomm system.

SPARE ADF AUDIO F A Connect wires to 2303TR1P2 when omni

kit is installed.
ADF AUDIO LOW
A

a>?
12 SPARE A
Refer to sheet 3 for audio isolation circuit
N SPARE AUDIO OUTPUT 14 OHM) 1 internal diagram.

13 SPARE AUDIO OUTPUT GND 11

SPARE POWER GND L

18 SPARE

15 SPARE J3 2303TR1P3

16 SPARE COMM ANTENNA VHF-101A

17 SPARE

14 SPARE

S SPARE 2303P1 2303J1

T SPARE

SPARE

2303J4 2303P4 2303E2P1

2303E2

206A/BS-M-97.21.4

Figure 97-21. KX-155 VHF COMM/NAVACS transceiver with KI-208 OMNI

indicator - wiring diagram (Sheet 4)

97-00.00
Page 54
 BHT 206AIB-SERIES-MM-11

2303DS1

KI-208 VOR/LOC INDICATOR

J1 2303DS1P1
2303TR1 2303TR1
+RIGHT DEFLECTION 11 NAY COMM KX-155 NAM COMM KX-155
2303TR1J2
- - - - - - -

9L°
+LEFT DEFLECTION 10 P401 2303TRIJ1

NAY COMPOSITE INPUT 2 VHF-5A22 - IH NAV COMPOSITE OUTPUT

P901 P901
hL Q
3 SPARE SPARE S
ILS ENERGIZE 4 VHF-6A22 - 13 ILS ENERGIZE
SPARE SPARE T
11 .33 VDC POWER INPUT B VHF-12E20 - VHF-7A22 WHT COMM MAC AUDIO
C SPARE SPARE U 2303CPiP1
GROUND 1 VHF-11A20N - VHF-7A22 BLU 0 COMM PAC KEY

SPARE 0 VHF-2A22N - 2303Wii Q

1
VHF-BA22 WHT E COMM AUDIO HI
9

0
SPARE

SPARE
SPARE

SPARE
R

B
VHF-101A

SPARE 0 VHF-8A22 BLU K COMM AUDIO LO

H SPARE SPARE D
VHF-9A22 WHT

z
SPARE 12 B G 10 NAY AUDIO HI
SPARE SPARE G
SPARE 3 C H VHF-9A22 BLU L NAY AUDIO LO
2 SPARE SPARE 7
D J J SPARE
4 SPARE SPARE J

z
VHF-13A22N SPARE
F SPARE SPARE 17
B MIC INTERCOMM HI
A SPARE SPARE K
C SPARE
TBB
SPARE SPARE 10

--------
14VDC LIGHTS HI

owe
SPARE
11 SPARE SPARE M I DM N48-1
28VDC LIGHTS HI VHF-10A22 A RNAV MODE

DATA BUS
L SPARE SPARE 12 L-------- VIEW A A2 HELICOPTERS S/N 4012 AND SUBSEQUENT
SPARE SPARE N
3 DME CLOCK
SPARE SPARE 13
D DME COMMON
SPARE SPARE
F RNAY REQUEST
SPARE

i
SPARE
2303C81 14 NAV REMOTE TRANSFER
NOTES
VHF-i
4 SPARE
2303TRiJ4
t0A P31A12 28VDC BUS P801 Refer to intercomm (king KMA-24H-711 wiring diaagram.
7 SPARE
CO MM ANTENNA VHF-DOA
2303TB1 28VDC PWR IN
Connect wires VHF-9A22 white and VHF-9A22 blue to

z
13
2303TR1J2 pins 10 and L respectively when
A4 E4 YF - 1A16 P 28VDC PWR IN 2303EIP1 206-705-008-141 omni kit is installed.
B4

C4
F4

G4 E
VHF - 1B16

H F -,C,,
VH 11 0-- V H F -3A16N
R

ID
COMM REMOTE TRANSFER

PWR GROUND
A Install contacts and stow wires adjacent to connector
(2303TR1J2).

D4 1 144 G AUX INPUT 1 INAVI A4 DM N48-1 antenna replaces C1 259 antenna.

VHF COW ANTENNA
A5 E5 VHF -12D16 dp- VHF -4A16N S PWR GROUND
2303E1
B5 F5 VHF- 12A16 12 SWITCHED PWR OUT

C5 G5 VHF -12B16 N SWITCHED PWR OUT I----------------------- -----,

05 H5 VHF- 12C16 11 SWITCHED PWR IN

t.t SWITCHED PWR IN

P301 2303TRIJ3 2303J1 2303P1 2303J4 2303P4 2303E2P1

NAV ANTENNA VHF-101A VHF-101B - I F--$- VHF-101C

''-. L..LLJJ 2303E2
NAY ANTENNA
II

L------------- SEE NEW A-------------- CI 259

206A/BS-M-91.22

Figure 97-22. KX-155 VHF COMMINAVACS transceiver with KI-208 VORILOC indicator -wiring diagram

97.00-00
Page 55
 BHT 206A/B-SERIES-MM-11

2301CPi
KMA-24H AUDIO CONTROL
2301CB2
2301CP J1 J1 2301CP1P1
ICS PHONE
11 SPARE 14/28 VDC PHONE/ICS 7 AUD-2A18

D 13.75 VDC LIGHTING ICS MIC 3 C AUD-5A22

2301CB1 I0 P31C12 28 VDC ESSENTIAL BUS
18 PA MUTE ICS MIC 4 8 AUD-6A22
ICS SPEAKER
A

It)
A MIC 2 KEY ICS MIC 5 Y 3
2301LS1
T ALTIMETER WRN INSTRUMENT LT RETURN E AUD-11A22N- j1,

16

M
} COMM 2 SPEAKER LOAD
14/28 VDC SPEAKER 20 AUD-1A18
SHAFT END (REF)

2301R1
AUD-21A22N -

r AUD-20622 -C
19

L
} COMM 1 SPEAKER LOAD
GROUND

SPEAKER GROUND
Z

22
AUD-9A18N --- 11,

AUD-3A22 AUD-23A22N 2301LS2

LAUD-20822

00
EMERGENCY PHONE 14 AUD-3A22
HF SPEAKER LOAD AUD-20A22 - AUD-20A22
ICS 2/MIC 2 AUDIO N AUD-4A22
AUD-22A22N
HF 500 OHM INPUT CABIN SPEAKER W AUD-t0A22

TEL RINGER EXT SPEAKER X

BUS (REF) TB6
K HF MIC AUDIO INTERNAL SPEAKER U AUD-4A22 - 2301R2

HF MIC KEY 27.5 VDC LIGHTING F AUD-8A22

2303T61-
COMM 2 MIC AUDIO
F10--0 Al Q

000
AUD-19A22
COMM 2 KEYLINE
ICS 1/MIC 1 AUDIO AUD-12A22 AUD-12A22 G10--0 B1
COMM 2 500 OHM OUTPUT
MIC 1 KEY AUD-13A22 AUD-13A22 H10- 0 C1
NAV 2 500 OHM INPUT
AUD-6A22 J10 -0 D1
DME 500 OHM INPUT
AUD-5A22 K10- 0 E1
MARKER 500 OHM INPUT
COMM 1 MIC AUDIO AUD-14A22 F2 0-0 A2
COMM 1 KEYLINE AUD-15A22 AUD-15A22 - G2 0-0 B2
AUD-14A22 - H2 0-0 C2
HEADPHONE OUT 3 AUD-16A22 (WHT) AUD-18A22 - J2 0--0 D2
AUDIO GROUND 1 AUD-16A22 (BLU) AUD-17A22 - K20-0 E2
AUD-7A22 - A3
0

COMM 1 500 OHM INPUT 9 AUD-17A22 F3

AUD-16A22 (WHT) G3 B3 NOTES

AUD-16A22 (BLU) H3 C3 A Refer to auxilliary speaker system
wiring diagram.
NAV 1 500 OHM INPUT AUD-18A22 J3 D3
Refer to ADF system wiring diagram.
ADF 500 OHM INPUT AUD-19A22 K3 E3

206A/BS-M-91-23

Figure 97-23. KMA-24H ICS audio control panel - wiring diagram

97.00-00
Page 56
 B1-IT 206A16-SERIES-MM-11

2301A1
AUDIO CONTROL PANEL PILOT CYCLIC STICK
KMA24H-71
2303WT1 2303S1

e.,
2301A1J1
2301A1J1
7
ICS 5 AUDIO
+ 14 VDC INST R LIGHTI N G
n 18 0 AUD - 16A22N A
r-0 C AUD-5 A22N

B AUD-10A22N AUD-8622
K COMM 5 MIC KEY
NAY 2 AUDIO 13
14 UNSWITCHED AUDIO
MIC 1 KEY 19 AUD - 20A22 AUD-20A22
10 UNSWITCHED/UNMUTED AUDIO
MIC 2 KEY X AUD - 12A22
0 COMM 3 MIC AUDIO
AIRFRAME GND A AUD-6A18N -dU 2301LS1
22 ICS 3 AUDIO COPILOT CYCLIC STICK
GRO UN D C AUD-9A18N -dll TB6
CABIN SPEAKER, RH COPILOT CYCLIC
DME AUDIO HI STICK DISCONNECT 2303S2
LIGHTING GROUND 17 AUD-IIA22N -dll 2301R2
PA MUTE 2303J3 2303P3 ICS RAD
+28 VDC PED LIGHTING U AUD-7A22 - ilk}- AUD-21A22N
21 ISOLATE P 390 AUD-8C22 -
CO MM 1 MIKE AUDI O
II
VHF-7A22 WHT - L.f-4 AUD-15822
12 MARKER BEACON AUDIO II SHAFT END AUD-IOA22N
COMM i MIC KEY C VHF-7A22 BLU - REF AUD-23A22N --CPU v
J COMM 3 MIC KEY AUD-12A22 -
COMM 5 MIC AUDIO 6 2301R1
2301LS2
R C O MM 5 AU DI O P
COMM 1 AUDIO VHF-8A22 WHT 2303S3
CABIN SPEAKER, LH
24 ISOLATE 2 III - COPILOT ICS FOOT SW
VHF-8A22 BLU AUD-151322 -
2 VOICE RECORDER COMM 4 MIC KEY

Y PRIVATE NA V 1 A UDIO P
P
VHF-9A22 WHT
e AUD-15A22 -
AUD-5A22N
`
I

II
I

AUD-22A22N
F COMM 4 MIC AUDIO VHF-9A22 BLU

15 COMM 4 AUDIO COCKPIT SPEAK E R 4 AUD-3A20 - 2303TB1 J41L P41L

BUS REF
AUD-4A22 - COPILOT HEADSET DISCONNECT
S COMM 3 AUDIO ADF AUDI O AUD-4A22 -i;-- F10--0 Al
COPLT HEADSET
COMM 2 MIC AUDIO P AUD-18A22 4
MIC 1/ICS 1 AUDIO AUD-13A22 WHT
II 2
COMM 2 MIC KEY II AUD-191322
AUD-13A22 BLU
16 COMM 2 AUDIO P AUD-14A22 WHT 3
I
PILOT PHONES AUD-17A22 WHT I 1

ii AUD-14A22 BLU
S P KR GN D AUD-17A22 BLU

KEY ENA BL E/ DISA BL E V 0 AUD-18A22 - J41R P41R

AUD-8A22 - PILOT HEADSET DISCONNECT

ICS KEY W

CREW PHONES 8 AUD-19A22 - - AUD-17A22 WHT

MIC 2/ICS 2 AUDIO 20 AUD-14A22 WHT - AUD-17A22 BLU

I - t

II
AUD-14A22 BLU - AUD-13A22 WHT

+28 VDC PWR SPKR AMP 7 AUD-1A18 - AUD-13A22 BLU

+28 VDC HEADPHONE AMP 25 AUD-2A18 -

NOTE
2301A1MP1 GND i
STRIP
Al REFER TO VHF COMM/NAY (KING KXA55
2301CB2 AND KI-208) AUDIO WITH KING KMA-24H-71
ICS PHONE 1A AUDIO CONTROL INSTALLED-WIRING DIAGRAM
28 VDC BUS P31C12 2301CB1
(1)

ICS SPEAKER
3A 206A/BS-M-91.24

Figure 97-24. KMA-241-1-71 ICS audio control panel - wiring diagram

97-00.00

obi
Page 57
 BHT-206AIB-SERIES-MM-11

2301CB1
ICS SPEAKER
2303WT1
AUD-51A22

-cD, AUD-73A22 -

-
AUD-51822 AUD-61A22N -
AUD-50A22 2301LS3
c
11k)-- AUD-56B22N --m--
2301AR1
U AUD-68B22N

AUD-70B22N
AUD-58B22 -

AUD-72A22N -
FT-25 AMPLIFIER
AUD-72622N 2301J1 2301P1 AUD-71A22 -
J1 2301AR1P1
AUD-61B22N A AUD-61A22N 1 2 C 3 4
28 VDC INPUT A AUD-50A22
AUD-58A22N B AUD-58B22 INT
I PASS
4 OHM OUTPUT AUD-51A22
F
I'---- ----
C AUD-72A22N

GROUND - AUD -53A22N ---III D AUD-70A22N

MIC KEY H - AUD-54A22 AUD-54A22 E AUD-54B22

I n
CALL
n
ON
I

500 OHM OUTPUT AUD - 52A22 AUD- 69A22 F AUD-691322

K AUD-68A22N
4 OHM LOAD AUD-5 5A 22
AUD-67C22 H AUD-67822 AUD-73A22
500 OHM INPUT S I-- AUD-55822
rv AUD-65B22 J AUD-65A22 AUD-70A22N

A/ AUD-54B22

2301S1
2301CP1 AUD-69B22 - NC
HANDSET CRADLE
KMA-24H AUDIO CONTROL
J1 2301CP1P1 AUD-67C22
AUD-68A22N 0 ICB
2301CR1 0-J I NO
EXT SPEAKER AUD-55C22 AUD-66A22 I

ICS MIC 5 AUD-74A22 0 AUD-67822 NC

2301R4 AUD-65C22 0 AUD-65A22 C C
HEADSET MIC LEVEL
1
2301TB2 AUD-64A22N AUD-71A22 NO

2303A1 11k}-AUD-63A22N
AUD-65822
O I

1
230151
206-077.500.1 CIRCUIT ASSY 2 INTERCOM CONTROL SWITCH
ilk)--- AUD-641322N HANDSET
J1 2301AIPI
AUD-52A22
ICI

AFT ICS MIC HI ATTEN AUD-52B22 WHITE

EARPHONE
ANNUNCIATOR LT CONT WHITE
AUD-66A22 NOTE
AFT ICS MIC HI OUT

AFT HEADSET HI
AUD-69A22 BLACK -0 0-
MIC SWITCH
Al REFER TO INTERCOMM
(KING KMA-24H)
BLACK WIRING DIAGRAM
AFT ICS PTT AUD-60A22
O RED -
MIC
AFT ICS MIC HI IN AUD-59A22 RED -

206A/BS-M-97-25

Figure 97-25. Auxiliary speaker - wiring diagram

97-00-00
Page 58
 BHT 206A1B-SERIES-MM-11

I--
ALTERNATE DIAGRAM FOR
ADF SYSTEM WHEN USING

11r,

z-i
KA-42B ANTENNA IN PLACE
OF SEPARATE LOOP AND

L!)
SENSE ANTENNAS

KR-85

moo
KI.225 INDICATOR AUTOMATIC DIRECTION FINDER

P105 P49

9 VDC IN RN337A22 9 VDC OUT

RED

BLK 15 GROUND

li

F,3
MATCHING
NETWORK
1)

BLU 16 SENSE ANTENNA

KA-42B
LOOP-SENSE ANTENNA
P130

RN513A

F P128 FP129

BRN B

WHT 3

BLK

RED

RN514A20N

206A/BS-M-97-26-1

Figure 97-26. KR-85 ADF with separate loop and sense antennas and with KA-42B loop-sense
antenna - wiring diagram (Sheet 1 of 2)

00)
97-00-00

nee
Page 59
 BHT 206AIB-SERIES-MM-11

C82

TO COM-NAV SYSTEM RN344A22 1-AO- P31B12 28 VDC

RN332A22 ADF
TB30 TERMINAL 8
OVERHEAD CONSOLE

KR-85 AUTOMATIC
KI.225 INDICATOR DIRECTION FINDER

LL)
P105 P49 i

I
J105
t
RN346A RN346A

U 2
1
OR 1

R40 3
8TB1 T86
RN344A22 -JVVv RN331A22 - 14 VDC IN
I
PANEL LIGHTS

171
RN342A22 B5 RN332A22- 5 I

AUDIO OUT

z
RN333A22N
I

z
- RN334A22 - RN334A22- PANEL LIGHTS 1

90' SWITCH

z
RN335A22 14 VDC TO 90`SWITCH

z
RN335A22 B
I
zz

GND P RN343A22N RN336A22N 9 GND I

c+)

9 VDC IN H RN337A22 RN337A22 10 9 VDC OUT

14 VDC IN L RN338A22 RN338A22- 11 14 VDC OUT I

I
c09

SERVO OSC M

z
RN339A22

z
RN339A22 12 SERVO OSC

SERVO OSC RN340A22

z
K RN340A22- 13 SERVO OSC 1

I
z

SERVO AMP RN341A22 RN341A22 14 SERVO AMP OUTPUT

L.J
15 I
J48 F P48 I

z
RN324A

m
RN345A 16 SENSE ANT
711 BLUE -
1
LOOP 2 GREEN I

ANTENNA RED -

WHITE

L._ INSTRUMENT CONSOLE

J P52 F PJ52 J52

P50 50A N WHITE 6

- RN324A
N BLUE 3
P50A
5 LOOP ANTENNA
INDUCTORS

N GREEN 8

KA-17 SENSE ANTENNA

RED
206A/BS-M-91-26-2

Figure 97-26. KR-85 ADF with separate loop and sense antennas and with KA-42B loop-sense
antenna - wiring diagram (Sheet 2)

97.00-00
Page 60
 BHT-206A/B-SERIES-MM-11

3406RE1 34060S1
KING KR-87 ADF RECEIVER KING KI-227 INDICATOR
3406RE1P2 3406DS1P1 J1

DC SIN OUT IAN ADF- A22

I ADF-IA22 - C DC SIN IN

DC COS OUT B ADF - 2A22 ADF-2A22 - DC COS IN

+4.5 VDC COMMON D ADF -3A2 2 ADF-3A22 - B +4.5 VDC COMMON

SPARE 4 ADF-4H22N H GROUND

AGC OUT 14 3406CB1 D 13.75 VDC LIGHTING

32 Hz VARIABLE OUT

ET ALARM OUT
7

11
AD F-7A2 2 5
--C 5
ADF
- P31B12 28 VDC BUS
ADF-6B22 A

F
27.5 VDC LIGHTING

SPARE

FLIGHT TIMER RESET K J SPARE

FLIGHT TIMER RESET J 3406WT1 K SPARE

GROUND S DF -4A2 2N ADF-4822N L SPARE

m
GROUND R ADF-4 C22N G SPARE

GROUND P ADF -4D2 2N C ADF-4.120N -III N SPARE

GROUND M A DF-4 E22N D ADF-4H22N - SPARE

GROUND H ADF -4F22 N ADF-4G22N - LR SPARE

AUDIO HIGH 1 0 ADF-5A22

13.75 VDC LIGHTING L 2303TB1

27.5 VDC LIGHTING 0 ADF -6A22 ADF-5A22

27.5 VDC POWER 13

TOP/BOTTOM MOUNT E ADF-4G22N T86

340681
Cap

SPARE C ADF-6A22
1004
Cap

SPARE N ADF-6822
- ADF-8A24 (GRN)
POLARIZER KEY
7a0
m

SPARE 0
- ADF-8A24 (WHTI
SPARE 3
- ADF-8A24 (BLU)
m m

SPARE 2
- ADF-BA24 (RED)
SPARE
- ADF-8A24 (ORN)
GROUND 15 ADF-8A24 (GRN)
i
r- ADF-9A
32 Hz 0° F ADF-8A24 (WHT)

32 Hz±90' ADF-8A24 (BLU)

LOOP ENABLE 9 ADF-8A24 (RED)

ANTENNA POWER 12
t ADF-8A24 (ORN)
3406E1P1
ADF-4A22N - 8 9 6 1 2 4 5

ADF-4822N -
I I J1
3406E1

3406RE1P1
KING KA-44 ANTENNA
J1

ANTENNA ADF-9A

206A/BS-M-97.27

Figure 97.27. KR-87 ADF and KI-227 indicator - wiring diagram

97-00.00
Page 61
BHT 206A/B-SERIES-MM-11

C612

z
XPNDR
AVIONICS
XPNDR-2A22 ---C j 5 P31C12

z
28 VDC BUS

WINDSHIELD CENTERPOST

KT-76A TRANSPONDER
TB6
n
P131

z
XPNDR-5A22N GROUND
F R58
XPNDR-4A22 3 PANEL LIGHTS
120
50W
XPNDR-3A22 11, 13.75 VDC

P97

z
ANTENNA P97

KT-76A TRANSPONDER KIT 206-706-070-025 AND -027

C812
XPNDR

<<_
AVIONICS
KT76.4A22 --dl. 5 P31C12 28 VDC BUS

WINDSHIELD CENTERPOST

KT-76 TRANSPONDER
P96
TB6

z
KT76-1A22 12 GROUND
R41

10f) KT76-2A22 11 PANEL LIGHTS

55W
KT76-3A22 --- 5 13.75 VDC

P97

C ANTENNA

KT-76 TRANSPONDER KIT 206-706-326.049 AND -051

206A/BS-M-91.28

Figure 97-28. KT-76/KT-76A transponder - wiring diagram

97-00-00
Page 62
 BHT 206A/B-SERIES-MM-11

3410T R 1

KING KT-76A TRANSPONDER

3410TR1P1

GROUND
J1
n XPNDR-1A22N
TB6
14 VDC LIGHTING 2

28 VDC LIGHTING 3 XPNDR-2A22

SPARE 4

SPARE 5

10.
SPARE 6

SPARE 7

BUS
'T1

EXTERNAL IDENTIFICATION F

San
DME SUPPRESSION 9
3410CB1
3410R1
SPARE 10

11-33 VDC PWR IN 11 XPNDR-3A22

SPARE 12

GROUND A XPNDR-1B22N

ALT ENCODER B4 B

ALT ENCODER B2 C
POLARIZER KEY
ALT ENCODER Cl D

ALT ENCODER B1

ALT ENCODER D4 8

ALT ENCODER C4 H
o

ALT ENCODER A4 J

ALT ENCODER A2 K

ALT ENCODER C2

ALT ENCODER Al M
SPARE G

J2 3410TRM
z

ANTENNA XPNDR-5A

3410E1P1

3410E1
A
KING KA-60 ANTENNA

206A/BS-M-97-29

Figure 97-29. KT 76A transponder - wiring diagram

97-00-00
Page 63
BHT 206A/B-SERIES-MM-11

3410TR1
KING KT-79 TRANSPONDER
J1

n
GROUND 1 XPNDR-IA22N
TB6
14 VDC LIGHTING 2

28 VDC LIGHTING 3 XPNDR-2A22

SPARE 4

SPARE 5

SPARE 6

SPARE 7

EXTERNAL IDENTIFICATION F

DME SUPPRESSION 9
3410CB1
SPARE 10

11-33 VDC PWR IN 11 XPNDR-6A22 P31C12 28 VDC BUS

SPARE 12

GROUND A XPNDR-1B22N

ALT ENCODER B4
POLARIZER KEY
ALT ENCODER B2 C

ALT ENCODER Cl

ALT ENCODER B1 E

ALT ENCODER D4 8

ALT ENCODER C4 H

ALT ENCODER A4 J

ALT ENCODER A2 K

ALT ENCODER C2 L

ALT ENCODER Al M
SPARE
L)
J2 3410TR1P2

ANTENNA XPNDR-5A

3410E I
KING KA-60 ANTENNA

HELICOPTERS S/N 4212 AND SUBSEQUENT

206A/BS-M-97-30

Figure 97-30. KT 79 transponder - wiring diagram

97-00-00
Page 64