BHT-212-MM-3

CHAPTER 26 — FIRE PROTECTION

TABLE OF CONTENTS

Paragraph Chapter/Section Page

Number Title Number Number

FIRE PROTECTION

26-1 Fire Protection Systems................................................................. 26-00-00 3

FIRE DETECTION

26-2 Engine Fire Detection .................................................................... 26-00-00 5

26-3 Engine Upper Fire Detection Sensing Elements ...................... 26-00-00 5
26-4 Engine Upper Fire Detection Sensing Elements
— Removal ....................................................................... 26-00-00 5
26-5 Engine Upper Fire Detection Sensing Elements
— Inspection and Repair .................................................. 26-00-00 5
26-6 Engine Upper Fire Detection Sensing Elements
— Installation .................................................................... 26-00-00 5
26-7 Engine Firewall Fire Detection Sensing Elements .................... 26-00-00 6
26-8 Removal............................................................................ 26-00-00 6
26-9 Inspection and Repair ....................................................... 26-00-00 6
26-10 Installation......................................................................... 26-00-00 6
26-11 Operational Check ............................................................ 26-00-00 6
26-12 Baggage Compartment Smoke Detection System ........................ 26-00-00 6
26-13 Baggage Compartment Smoke Detector.................................. 26-00-00 6
26-14 Removal............................................................................ 26-00-00 6
26-15 Inspection.......................................................................... 26-00-00 6
26-16 Installation......................................................................... 26-00-00 9
26-17 Operational Check ............................................................ 26-00-00 9

FIRE EXTINGUISHERS

26-18 Fire Extinguishers .......................................................................... 26-00-00 11

26-19 Engine Compartment Fire Extinguishers .................................. 26-00-00 11
26-20 Removal............................................................................ 26-00-00 11
26-21 Inspection ......................................................................... 26-00-00 13
26-22 Repair/Replacement ......................................................... 26-00-00 13
26-23 Installation......................................................................... 26-00-00 18
26-24 Discharge Indicator Disc........................................................... 26-00-00 19
26-25 Removal............................................................................ 26-00-00 19
26-26 Inspection ......................................................................... 26-00-00 19
26-27 Installation......................................................................... 26-00-00 19
26-28 Portable Fire Extinguishers and Brackets................................. 26-00-00 19
26-29 Removal............................................................................ 26-00-00 19
26-30 Inspection ......................................................................... 26-00-00 22
26-31 Repair .............................................................................. 26-00-00 22
26-32 Installation......................................................................... 26-00-00 22

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BHT-212-MM-3

FIGURES

Figure Page
Number Title Number

26-1 Engine Compartment Fire Detection Sensing Element ...................................... 7

26-2 Baggage Compartment Smoke Detector ............................................................ 10
26-3 Engine Compartment Fire Extinguisher Schematic ............................................ 12
26-4 Engine Compartment Fire Extinguisher .............................................................. 14
26-5 Portable Fire Extinguishers and Brackets........................................................... 20
26-6 Fire Extinguisher Cartridge Wiring Diagram ....................................................... 21

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 BHT-212-MM

FIRE PROTECTION

26-1. FIRE PROTECTION SYSTEMS. baggage compartment smoke detector, and

two cabin mounted, hand-held, portable fire
Fire protection items include engine fire extinguishers.
detection elements and extinguishers,

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 BHT-212-MM-3

FIRE DETECTION

26-2. ENGINE FIRE DETECTION 2. Disconnect electrical connectors (10 and 11,
Figure 26-1).
Engine compartment fire detection consists of two
heat sensing elements and two flexible cable 3. Remove screw (9) from clamp (8). Remove
assemblies for each power section of the engine. A screws from six remaining clamps in same manner.
press-to-test switch is provided to test the system.

4. Spreading clamps as little as possible, remove

If a fire or overheat condition occurs, the heat sensing
elements in the affected power section close a circuit, sensing element (2).
which causes the corresponding FIRE PULL handle
(located on the instrument panel) to illuminate. Pulling 26-5. Engine Upper Fire Detection Sensing
the handle turns off the heater by de-energizing both Elements — Inspection and Repair
bleed air valves, and causes the engine air
management bypass door and the fuel shutoff valve to
close, shutting off both air and fuel to the affected Refer to Chapter 96 for inspection and functional
power section. Pulling FIRE 1 PULL or FIRE 2 PULL testing of sensing elements. Replace elements and/or
handle also arms the main and reserve fire retaining hardware if unserviceable.
extinguisher circuits for the corresponding power
section. Placing the FIRE EXT switch to MAIN causes
26-6. Engine Upper Fire Detection Sensing
the main fire extinguisher bottle to discharge
Elements — Installation
extinguishing agent (Halon and nitrogen) into the
selected power section compartment. Placing the
FIRE EXT switch to RESERVE discharges the reserve
fire extinguisher bottle into the same compartment. MATERIALS REQUIRED

Pressing the FIRE EXT PRESS TO TEST switch Refer to BHT-ALL-SPM for specifications.
places a low resistance across each of the fire sensing
elements to simulate a fire/overheat condition. If NUMBER NOMENCLATURE
sensing elements are operating properly, both FIRE 1
C-405 Lockwire
PULL and FIRE 2 PULL handles will illuminate.

26-3. ENGINE UPPER FIRE DETECTION 1. Verify all electrical power is removed from
SENSING ELEMENTS helicopter.

The upper fire detection sensing elements are 2. Position sensing element (2, Figure 26-1) on
mounted on the underside of the upper engine cowling upper cowl as shown in View A.
(Figure 26-1).

3. Spreading clamps (8) as little as possible, install

NOTE sensing element (2) in clamps.
Maintenance procedures are the same for
both left and right upper sensing elements. 4. Install screws (9) in clamps (8).

26-4. Engine Upper Fire Detection Sensing

Elements — Removal 5. Connect electrical connectors (10 and 11). Apply
lockwire (C-405).
1. Verify all electrical power is removed from
helicopter. 6. Perform operational check (paragraph 26-11).

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ECCN EAR99 30 APR 2010 Rev. 11 Page 5
BHT-212-MM

26-7. ENGINE FIREWALL FIRE 26-12. BAGGAGE COMPARTMENT

z
DETECTION SENSING ELEMENTS. SMOKE DETECTION SYSTEM.

NOTE
The baggage compartment smoke detector is
a closed assembly housing solid-state
Maintenance procedures are the electronic components and a light sensitive
same for both left and right sensing detector. The detector (4, figure 26-2) is
figure 26-2
elements. located in the forward end of the baggage
compartment roof. A protective screen is

La)
installed over the detector to provide

0.m
26-8. Removal. protection from items stowed in the
compartment. The instant smoke reduces

E
1. Verify all electrical power removed from light transmission in the baggage com-
helicopter. partment 30 to 35% below that of clear air,

-s-
-'Q3
the detector causes the BAGGAGE FIRE
2. Disconnect electrical connectors (14 and
r..

warning light on the instrument panel to flash

15, figure 26-1).
figure 26-1 intermittently. For more detailed description
and wiring diagrams, refer to Chapters 96 and
Chapters 96
3. Remove screws (13) from clamps (12). 98.
98
4. Spread clamps as little as possible and The BAGGAGE FIRE TEST switch provides a
remove sensing element. means to test the baggage smoke detection
system.
26-9. Inspection and repair.
'++
'())

26-13. BAGGAGE COMPARTMENT

Refer to Chapter 96 for inspection of sensing
Chapter 96 SMOKE DETECTOR.
elements. Replace elements and/or retaining
hardware if unserviceable. The smoke detector is a sealed, solid-state
unit. Refer to Chapter 96 fo additional
^J_

Chapter 96
26-10. Installation. information.

1. Verify all electrical power removed from

E

26-14. Removal.
helicopter.
1. Remove all electrical power from
2. Position sensing element in clamps (12,
gy=m
Cam.

helicopter.
figure 26-1).
figure 26-1
2. Open baggage compartment door (9,
3. Install retaining screws (13) in clamps. figure 26-2).
_':

figure 26-2
4. Connect electrical connectors (14 and 3. Remove screws (7) and screen (6).
15).
4. Disconnect electrical connector (5).
5. Perform operational check (paragraph 26-
paragraph 26-
11).
11 5. Remove screws (3) and washers (2).
Remove smoke detector (4).
26-11. Operational check.
26-15. Inspection.
Perform operational ch eck after any
°>0

maintenance on fire de tection system 1. Inspect smoke detector for physical

(Chapter 96).
Chapter 96
damage.
2. Inspect electrical connector for pin
alignment and contact retention.
'',

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 BHT-212-MM

I)

I I

li
I I
Lj-

SENSING ELEMENT ON
LEFT ENGINE POWER
SECTION TOP COWL
(VIEW LOOKING DOWN)
VIEW A 212-M-26-1-1

Figure 26-1. Engine compartment fire detection sensing element (sheet 1 of 2)

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BHT-212-MM

SENSING ELEMENT ON
LEFT ENGINE POWER
SECTION FIREWALL
(VIEW LOOKING FORWARD)
VIEW B

1 . Sensing element (right engine power section top cowl) 9. Screw

f)'

3``

2. Sensing element (left engine power section top cowl) 1 0. Electrical connector
3. Flex cable 1 1. Electrical connector
4. Upper engine cowling 1 2. Clamp (eight required)
5. Engine cowl top panel 1 3. Screw
6. Sensing element (left power section firewall) 1 4. Electrical connector
coin.

7. Sensing element (right power section firewall)

I-:

1 5. Electrical connector
8. Clamp (seven required)
212-M-26-1-2

Figure 26-1. Engine compartment fire detection sensing element (sheet 2)

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 BHT-212-MM

26-16. Installation. 5. Close baggage compartment door.

1. Align mounting holes in detector (4, figure
figure 6. Perform operational check (paragraph 26-
paragraph 26-
26-2)
26-2 with airframe mounting holes. 17).
17

2. Install screws (3) and washers (2).

26-17. Operational check.
3. Connect electrical connector (5).
Perform operational check after any
maintenance on baggage compartment smoke

((DD
4. Install screen (6) with screws (7) and
washers (8). detection system (Chapter 96).
Chapter 96

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BHT-212-MM

1. Decal
2. Thin aluminum washer
3. Screw
4. Smoke detector
5. Electrical connector
6. Protective screen
7. Screw
8. Thin steel washer
9. Baggage compartment door

VIEW LOOKING INBOARD

car

RIGHT HAND SIDE

212-M-26-2

Figure 26-2. Baggage compartment smoke detector

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 BHT-212-MM

FIRE EXTINGUISHERS

26-18. FIRE EXTINGUISHERS.

WARNING
The helicopter is equipped with two engine
compartment fire extinguishers and two

._«
portable, cabin mounted fire extinguishers. THE FIRE EXTINGUISHER
CONTAINERS ARE PRESSURIZED
AND EQUIPPED WITH PYRO-
26-19. ENGINE COMPARTMENT FIRE TECHNIC CARTRIDGES. ANY
EXTINGUISHERS. TIME CONNECTING WIRES ARE
DISCONNECTED, SHORTING
The two engine compartment fire

0-0--
0
0

DEVICES (JUMPER WIRES) (45

extinguishing bottles are interconnected by AND 46, FIGURE 26-4) SHALL BE

>10
FIGURE 26-4
tubing to allow either container to be INSTALLED TO PREVENT

Z
discharged into either power section INADVERTANT DETONATION.
compartment (figure 26-3). Therefore, in the
figure 26-3
cao+,

event discharging the first (main) bottle fails

y..,

DO NOT USE A VOLTMETER,

0<z
Z
to extinguish a fire, the second (reserve)
O-0

bottle may be discharged into the same FLASHLIGHT BATTERY, CON-

compartment. TINUITY LIGHT OR SIMILAR
DEVICE TO TEST CARTRIDGES.
The containers (figure 26-4) are spherical
figure 26-4
(6-O

steel assemblies charged with freon and DO NOT LOOSEN FITTINGS AT

X11

nitrogen to approximately 600 psi. If the DISCHARGE OUTLETS (5 OR 29),

C

0)0

container is discharged, no special cleaning is PRESSURE INDICATOR GAGE

required because of the non-corrosive (25), OR FILL AND THERMAL
0"o

properties of the extinguishing agent. Each RELIEF FITTING (14) WHEN

container has two outlets each equipped with CONTAINER IS PRESSURIZED.
electrically actuated pyrotechnic cartridges, a
guarded pressure gage, and a fill and thermal ENSURE NO POWER IS APPLIED
(rte

relief fitting connected to a discharge indicator TO HELICOPTER ELECTRICAL

disc. A pressure/temperature correction decal SYSTEMS AND HELICOPTER IS
Z
.2.C

is attached to each cylinder to aid during PROPERLY GROUNDED WHILE

0

inspection and servicing. PERFORMING MAINTENANCE ON

FIRE EXTINGUISHING SYSTEM
In the event a container is subjected to
excessive heat, the fill and thermal relief
a)4-

fitting will open and allow the extinguishing 26-20. Removal.

agent to escape. During this process, the
w-0

discharge indicator disc will be blown out to

provide a visual indication of the event. WARNING

For further operational information and wiring

E0)

diagrams, refer to Chapters 96 and 98. REMOVE HELICOPTER WIRING

imam

Chapters 96 98
CONNECTORS ONE AT A TIME
AND INSTALL JUMPER WIRE
NOTE (SHORTING PLUG) AT VACANT
ACC

Maintenance procedures for both fire TERMINAL PRIOR TO REMOVING

extinguisher containers are the FURTHER WIRING. TAG
DISCONNECTED WIRES FOR
-W0

same.
REINSTALLATION IN PROPER
LOCATION.
Z

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BHT-212-MM-3

RESERVE MAIN
FIRE EXT FIRE EXT
CONTAINER CONTAINER
(LEFT) (RIGHT)

RIGHT POWER LEFT POWER RIGHT POWER LEFT POWER

SECTION SECTION SECTION SECTION
DISCHARGE DISCHARGE DISCHARGE DISCHARGE
VALVE VALVE VALVE VALVE
CARTRIDGE CARTRIDGE
ASSEMBLIES ASSEMBLIES
(SQUIBS) (SQUIBS)

LEFT RIGHT
POWER POWER
SECTION SECTION
MANIFOLD MANIFOLD

F
PRESS TO TEST I
FIRE 1 PULL R FIRE 2 PULL
E
MAIN E
X
OFF T
RESERVE
LEFT POWER SECTION RIGHT POWER SECTION
BLEED AIR VALVE BLEED AIR VALVE

LEFT POWER SECTION RIGHT POWER SECTION

FUEL VALVE FUEL VALVE

LEFT POWER SECTION RIGHT POWER SECTION

AIR MANAGEMENT AIR MANAGEMENT
SYSTEM DOOR SYSTEM DOOR
NO. 1 (LEFT) SYSTEM
NO. 2 (RIGHT) SYSTEM
212_MM_26_0003

Figure 26-3. Engine Compartment Fire Extinguisher Schematic

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 BHT-212-MM-3

1. Verify that all the electrical power is removed from structural integrity is acceptable without repair. If
the helicopter and that the helicopter is properly damage is such that loss of the structural integrity is
grounded. suspected, the container shall be replaced.

2. Open the engine cowling to gain access to the 2. Inspect the temperature/pressure correction
extinguisher bottles. decal for security and legibility.

3. Remove the nut (37, Figure 26-4). Tag and

remove the electrical wire (36). 3. Inspect the pressure indicator gauge (25,
Figure 26-4) for acceptable range as shown on the
temperature/pressure correction table decal.
4. Install the jumper wire (45) on the terminal (35)
and install the nut (37).
4. Examine the decals on the pressure indicator
5. Remove the nut (34) and the electrical wire (32) gauge (25) for condition and security. Replace as
with the nipple (33). Tag the electrical wire. required (Chapter 11).

6. Install the loose end of the jumper wire (45) on 5. Replace or recharge the container if empty.
the terminal (31) with the nut (34).

6. Inspect the manifolds (2 and 28) and the forward

7. Remove the nut (41) and the electrical wire (43)
tubes (1) for obstructions or restrictions in the holes
with the nipple (42). Tag the electrical wire.
provided for the discharge.
8. Install the jumper wire (46) on the terminal (44)
and install the nut (41). 26-22. REPAIR/REPLACEMENT

9. Remove the nut (38) and the electrical wire (39).

Tag the electrical wire. MATERIALS REQUIRED

10. Install the loose end of the jumper wire (46) on Refer to BHT-ALL-SPM for specifications.
the terminal (40) with the nut (38).
NUMBER NOMENCLATURE
11. Disconnect the tube (3) from the discharge
C-405 Lockwire
outlet (5).

12. Disconnect the tube (18) from the discharge

outlet (29).
WARNING
13. Remove the hose assembly (16) from the fill and
thermal relief fitting (14).
THE FIRE EXTINGUISHER CONTAINERS
ARE PRESSURIZED AND EQUIPPED
14. Remove the bolts (8 and 10) and the thin WITH PYROTECHNIC CARTRIDGES.
aluminum washers (7 and 11). ANY TIME THE CONNECTING WIRES
ARE DISCONNECTED, JUMPER WIRES
15. Remove the bolt (12), thin aluminum washer (13), (45 AND 46, FIGURE 26-4) SHALL BE
and nut (15). Remove the container from the INSTALLED TO PREVENT
supports (6 and 17). INADVERTENT DETONATION.

26-21. INSPECTION DO NOT USE A VOLTMETER

FLASHLIGHT BATTERY, CONTINUITY
1. Inspect the container for obvious damage. LIGHT, OR SIMILAR DEVICE TO TEST
Superficial damage that does not affect the container THE CARTRIDGES.

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BHT-212-MM-3

Figure 26-4. Engine Compartment Fire Extinguisher (Sheet 1 of 2)

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 BHT-212-MM-3

Figure 26-4. Engine Compartment Fire Extinguisher (Sheet 2 of 2)

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BHT-212-MM-3

DO NOT LOOSEN THE FITTINGS AT THE HANDLING, THE ELECTRICAL

DISCHARGE OUTLETS (5 OR 29), CONNECTION PINS MUST BE SHORTED
PRESSURE INDICATOR GAUGE (25), OR TOGETHER. THE SHORTING DEVICE
FILL AND THERMAL RELIEF FITTING M US T B E R EM O V E D B E F O RE Y O U
(14) WHEN THE CONTAINER IS TEST OR CONNECT THE CARTRIDGE
PRESSURIZED. TO THE HELICOPTER WIRING.

MAKE SURE THAT NO POWER IS NOTE

APPLIED TO THE HELICOPTER
ELECTRICAL SYSTEMS AND THAT THE Replacement procedures for the fire
HELICOPTER IS PROPERLY extinguisher cartridges are typical. The
GROUNDED WHILE PERFORMING cartridges can be removed or installed with
MAINTENANCE ON THE FIRE the container pressurized.
EXTINGUISHER SYSTEM.
a. Replace the (HTL Industries) cartridges (4
1. Repair of the fire extinguisher system and 30, Figure 26-4) in the fire extinguisher containers
components is limited to replacement of unserviceable (9 and 22) as follows:
parts. To recharge or leak test the fire extinguisher
containers, refer to the appropriate Vendors Manuals. (1) Disconnect the battery and verify that all
Recharge the fire extinguisher containers as required the electrical power is removed from the helicopter
at a facility equipped and authorized to service the and that the helicopter is properly grounded.
extinguisher containers.
(2) Open the engine cowling to gain access
2. Refer to Chapter 4 for cartridge retirement and to the fire extinguisher containers.
replacement schedule. For cartridge testing, refer to
the appropriate Vendor Manuals. Replace the (3) Remove the nut (37). Tag and remove
cartridge as required (refer to step 4). the electrical wire (36) from the terminal (35).

3. Replace the container temperature/pressure (4) Install the jumper wire (45) on the
table decal if illegible or otherwise unserviceable. terminal (35) and install the nut (37).

(5) Install the loose end of the jumper wire

4. Replacement of cartridges. (45, Detail B) on the terminal (31) with the nut (34).
The jumper wire must remain connected at all times
when the cartridge (30) is disconnected from the
helicopter wiring.
WARNING
(6) Remove the nut (41) and the electrical
wire (43) with the electrical terminal nipple (42). Tag
REMOVE THE HELICOPTER WIRING
the electrical wire.
CONNECTORS ONE AT A TIME AND
INSTALL THE JUMPER WIRE
(SHORTING DEVICE) AT THE VACANT (7) Install the jumper wire (46) on the
TERMINAL PRIOR TO REMOVING terminal (44) and install the nut (41).
FURTHER WIRING. TAG THE
DISCONNECTED WIRES FOR (8) Remove the nut (38) and the electrical
REI NSTAL LAT IO N IN T HE P RO PE R wire (39). Tag the electrical wire.
LOCATION.
(9) Install the loose end of the jumper wire
THE CARTRIDGE IS A PYROTECHNIC (46) on the terminal (40) with the nut (38). The jumper
DEVICE. INADVERTENT DETONATION wire must remain connected at all times when the
OF THE CARTRIDGE CAN CAUSE cartridge (4) is disconnected from the helicopter
P E R S O N N E L I N J U R Y. F O R S A F E wiring.

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 BHT-212-MM-3

THAT THE WIRES ARE INSTALLED ON

WARNING THE CORRECT TERMINALS.

REMOVE THE ENDS OF THE JUMPER

WIRES ON AT A TIME AND INSTALL THE
TO PREVENT ACCIDENTAL DISCHARGE HELICOPTER WIRING TO EACH
OF THE CONTAINER DURING TERMINAL AS THE JUMPER WIRE IS
REPLACEMENT OF THE CARTRIDGES REMOVED.
(4 AND 30), THE LARGE (1.25 INCH
(31.8 MM)) HEX HOUSING ASSEMBLIES (14) Remove one end of the jumper wire (46).
(4A AND 30A) MUST BE HELD TO Install the correct helicopter wire with the attaching
PREVENT TURNING. nut. Remove the remaining end of the jumper wire and
install the correct helicopter wire. Verify the attaching
(10) Remove the lockwire from the housing hardware is installed and secure.
assemblies (4A and 30A) and the cartridges (4
and 30). (15) Repeat step (14) for the jumper wire (45).

(16) Connect the battery.

CAUTION
b. Replace the (Walter Kidde & Co. Inc)
cartridges (4 and 30, Figure 26-4) in the fire
DO NOT LOOSEN THE HOUSING extinguisher containers (9 and 22) as follows:
ASSEMBLIES (4A AND 30A). THIS MAY
CAUSE THE EXTINGUISHER TO (1) Disconnect the battery and verify that all
DISCHARGE AND CAUSE SERIOUS the electrical power is removed from the helicopter
INJURY. and that the helicopter is properly grounded.

(11) To remove the cartridges (4 and 30) from (2) Open the engine cowling to gain access
the housing assemblies (4A and 30A), unscrew the to the fire extinguisher containers.
cartridge while holding the hexagonal head of the
housing assemblies, to prevent accidental discharge. (3) Remove the nut (37). Tag and remove
Discard the seal. the electrical wire (36) from the terminal (35).

(12) Install the new seal on the cartridges (4 (4) Install the jumper wire (45) on the
and 30). Install the cartridges in the housing terminal (35) and install the nut (37).
assemblies (4A and 30A). Hold the hexagonal head of
the housing assemblies with a wrench while tightening (5) Install the loose end of the jumper wire
the cartridges to prevent excessive torque on the (45, Detail B) on the terminal (31) with the nut (34).
housing assemblies. Torque the cartridges 70 to The jumper wire must remain connected at all times
80 inch-pounds (7.91 to 9.04 Nm). when the cartridge (30) is disconnected from the
helicopter wiring.
(13) Install lockwire (C-405) on the housing
(6) Remove the nut (41) and the electrical
assemblies (4A and 30A) and the cartridges (4 and
wire (43) with the electrical terminal nipple (42). Tag
30).
the electrical wire.

(7) Install the jumper wire (46) on the

WARNING terminal (44) and install the nut (41).

(8) Remove the nut (38) and the electrical

REFER TO THE WIRING DIAGRAM wire (39). Tag the electrical wire.
(FIGURE 26-6) PRIOR TO CONNECTING
THE WIRES TO THE CARTRIDGES (4 (9) Install the loose end of the jumper wire
AND 30, FIGURE 26-4). MAKE SURE (46) on the terminal (40) with the nut (38). The jumper

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BHT-212-MM-3

wire must remain connected at all times when the

cartridge (4) is disconnected from the helicopter WARNING
wiring.

REFER TO THE WIRING DIAGRAM

(FIGURE 26-6) PRIOR TO CONNECTING
WARNING THE WIRES TO THE CARTRIDGES (4
AND 30, FIGURE 26-4). MAKE SURE
THAT THE WIRES ARE INSTALLED ON
TO PREVENT ACCIDENTAL DISCHARGE THE CORRECT TERMINALS.
OF THE CONTAINER DURING
REPLACEMENT OF THE CARTRIDGES REMOVE THE ENDS OF THE JUMPER
(4 AND 30), THE LARGE (1.25 INCH WIRES ONE AT A TIME AND INSTALL
(31.8 MM)) HEX HOUSING ASSEMBLIES THE HELICOPTER WIRING TO EACH
TERMINAL AS THE JUMPER WIRE IS
(4A AND 30A) MUST BE HELD TO
REMOVED.
PREVENT TURNING.
(14) Remove one end of the jumper wire (46).
(10) Remove the lockwire from the housing Install the correct helicopter wire with the attaching
assemblies (4A and 30A) and the cartridges (4 nut. Remove the remaining end of the jumper wire and
and 30). install the correct helicopter wire. Verify that the
attaching hardware is intalled and secure.

(15) Repeat step (14) for the jumper wire (45).

CAUTION
(16) Connect the battery.

DO NOT LOOSEN THE HOUSING 26-23. INSTALLATION

ASSEMBLIES (4A AND 30A). THIS MAY
CAUSE THE EXTINGUISHER TO
NOTE
DISCHARGE AND CAUSE SERIOUS
INJURY. Activation of the system does not
necessitate any maintenance to the engine
or the cowling area due to extinguishing
(11) To remove the cartridges (4 and 30) from
agent.
the housing assemblies (4A and 30A), unscrew the
cartridge while holding the hexagonal head of the 1. If the fire extinguisher container (9 or 22,
housing assemblies, to prevent accidental discharge. Figure 26-4) is being installed for the first time, make
Discard the seal. sure that the decals are installed on the pressure
indicator gauge (Chapter 11).
(12) Install the new seal on the cartridges (4
2. Position the fire extinguisher container (9) in the
and 30). Install the cartridges in the housing
supports (6 and 17).
assemblies (4A and 30A). Hold the hexagonal head of
the housing assemblies with a wrench while tightening
3. Install the bolts (8 and 10) with the thin aluminum
the cartridges to prevent excessive torque on the
washers (7 and 11).
housing assemblies. Torque the cartridges 150 to
200 inch-pounds (16.95 to 22.60 Nm).
4. Install the bolt (12), thin aluminum washer (13),
and the nut (15).
(13) Install lockwire (C-405) on the housing
assemblies (4A and 30A) and the cartridges (4 5. Install the hose assembly (16) on the fill and
and 30). thermal relief fitting (14).

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 BHT-212-MM-3

6. Install the tube (3) on the discharge outlet (5). 2. Disconnect the hose (20, Figure 26-4) from the
nipple (50).
7. Install the tube (18) on the discharge outlet (29).
3. Remove the screws (47), washers (48), and
nuts (49).

WARNING 4. Remove the discharge indicator disc (23).

26-26. INSPECTION
REFER TO THE WIRING DIAGRAM
(FIGURE 26-6) PRIOR TO CONNECTING Inspect the indicator discs on both containers for a
THE WIRE S TO THE CARTRIDGES . missing red indicator, secure installation, and obvious
MAKE SURE THAT THE WIRES ARE damage. A missing red disc indicates that the
INSTALLED ON THE CORRECT container may have discharged through the fill and
TERMINALS. thermal relief fitting.

REMOVE THE ENDS OF THE JUMPER 26-27. INSTALLATION

WIRES ONE AT A TIME AND INSTALL
THE HELICOPTER WIRING TO EACH
1. Position the discharge indicator discs (23,
TERMINAL AS THE JUMPER WIRE IS
Figure 26-4) in the support (24).
REMOVED.

2. Install the screws (47), washers (48), and the

8. Remove one end of the jumper wire (46). Install
nuts (49).
the correct helicopter wiring with the attaching nut.
Remove the remaining end of the jumper wire and
install the correct helicopter wire. Verify that the 3. Install the hose (20) on the nipple (50).
attaching hardware is secure.
4. Install the hose (20) on the fill and thermal relief
fitting (51).
9. Repeat step 7 for the jumper wire (45).

26-28. PORTABLE FIRE EXTINGUISHERS AND

26-24. DISCHARGE INDICATOR DISC BRACKETS

The maintenance procedures for both discharge Two hand-held, portable fire extinguishers are
indicator discs are identical. installed in the quick release brackets at the locations
illustrated in Figure 26-5. These extinguishers are
filled with bromochlorodifluoromethane or equivalent
extinguishing agent.
WARNING

NOTE
MAKE SURE THAT NO POWER IS Maintenance procedures for both the fire
APPLIED TO THE HELICOPTER extinguishers and the brackets are
ELECTRICAL SYSTEMS AND THAT THE identical.
HELICOPTER IS PROPERLY
GROUNDED WHILE PERFORMING 26-29. REMOVAL
MAINTENANCE ON THE FIRE
EXTINGUISHER SYSTEM. 1. Release the clamp (7, Figure 26-5) and remove
the fire extinguisher.
26-25. REMOVAL
2. Remove the bolts (8), thin aluminum washer (9),
1. Remove all electrical power from the helicopter. bracket (11), and aluminum washers (10).

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BHT-212-MM-3

Figure 26-5. Portable Fire Extinguishers and Brackets

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 BHT-212-MM-3

Figure 26-6. Fire Extinguisher Cartridge Wiring Diagram

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BHT-212-MM-3

26-30. INSPECTION 2. Replace the unserviceable bracket parts and the

retaining hardware.
1. Inspect the fire extinguisher (6, Figure 26-5) for
the state of the charge by weight or by visual indicator, 26-32. INSTALLATION
if installed.
1. Position the bracket (11, Figure 26-5) in position
2. Record the inspection on the tag attached to the with the aluminum washers (10) between the bracket
extinguisher (Detail A). and the mounting surface.

3. Inspect the bracket and the attaching hardware 2. Install the bolt (8) and the thin aluminum washers
for obvious damage and security of the installation and (9). Tighten the bolts.
serviceability.
3. Open the retaining clamp (7) and position the fire
26-31. REPAIR extinguisher in the bracket. Close the retaining clamp.

1. Recharge the fire extinguisher, as required, at a 4. Verify that the bracket is securely installed in the
facility equipped and authorized to service helicopter and the fire extinguisher is securely
bromochlorodifluoromethane type extinguishers. installed in the retaining bracket.

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