MARKER BEACON
ANTENNA
ATA 34-31-03
1
LOCATION
2
CONTENTS
REMOVAL
INSTALLATION
TEST
3
REMOVAL
Nearly all antennas may be removed in the
following manner:
Note: Refer to Figure 401 for typical antenna
locations.
1. Make sure that the BAT switch is set to the
OFF position and tag the switch with a caution
tag indicating
"DO NOT APPLY POWER".
2. Perform the BATTERY POWER
DISCONNECT procedure (Ref. 24-30-01, 201
) and tag the connector with a caution tag "DO
NOT RECONNECT".
4
REMOVAL
3. Remove the attaching hardware from
around the antenna base.
4. Carefully break the seal between the
antenna and the airplane skin surface.
5. Disconnect the coaxial cable from the
antenna and secure the cable so it will not
fall into the antenna opening.
6. Remove the antenna from the airplane.
5
Ref. 24-30-01, 201
Battery Power Disconnect
1. Turn Battery Switch to OFF.
2. Remove the battery access panel located on the upper right hand center section between
the fuselage and nacelle to gain access to the wing mounted battery.
3. Remove the battery cover on FL-215 and After, except FL-318.
4. Remove the lockwire and disconnect the battery connector from the battery. Cover or
insulate the battery terminals.
6
INSTALLATION
1. Perform the COMM, NAV, ADF,
TRANSPONDER, ETC. ANTENNA
BONDING procedure (Ref. 20-10-01.201).
2. Connect the coaxial connector to the antenna
and position the antenna for installation (Ref.
Figure 401).
3. Secure the antenna to the airplane skin with
the attaching hardware.
4. Perform the BATTERY POWER CONNECT
procedure (Ref. 24-30-01, 201) and remove
the caution tags.
5. Perform the NAVIGATION TRANSCEIVER
TEST procedure (Ref. 34-31-01, 501)
7
Ref. 20-10-01.201
COMM, NAV, ADF, Transponder, etc. antenna
bonding
Note: The pattern and efficiency of an antenna is dependent upon a low impedance (Z) path to the
ground plane. It is imperative that a uniform resistance and capacitance be maintained between the
contacting surface of the antenna and the surface on which it is mounted. The mating surface between
the antenna and the base must be smooth and contoured to match, keeping the mating surfaces in
actual contact.
1. Determine the contact area of the antenna to be mounted.
Warning: Use solvent only in an adequately ventilated area.
2. Using a clean, lint free cloth dampened with solvent cleaner clean all grease, oil and other
nonconductive films from the contact surfaces of the antenna, spacer and the mounting surface of
the fuselage.
Caution: Do not use emery or iron oxide paper/cloth in removing nonsoluble films from the
contact area.
8
Ref. 20-10-01.201
COMM, NAV, ADF, Transponder, etc. antenna
bonding
3. Clean nonsoluble films from the contacting surfaces by sanding and polishing with fine
garnet paper or silicon carbide, taking care not to remove excessive metal. Small areas
on an aluminum surface may be cleaned with a stainless steel wire brush. The area
should then brushed clean and wiped, using a clean, lint free cloth dampened with
solvent cleaner.
Warning: Use rubber gloves when handling chemical conversion coating.
4. Allow the area to thoroughly dry for a maximum of one hour prior to installation of the
mating parts. If the drying time exceeds one hour, retouch the area with coating and
neutralize with water.
9
Ref. 20-10-01.201
COMM, NAV, ADF, Transponder, etc. antenna
bonding
Caution: Do not alter the length of any coaxial cable. A change in length could affect system
operation.
5. Attach a coaxial cable to the antenna. Antenna excess coaxial cable should be stored
inside the airplane. Apply sealant around the coaxial cable where it passes through the
skin.
6. Install the antenna with the attaching screws.
7. Fillet seal around the entire periphery of the antenna with sealant.
8. Retouch the painted area around the antenna as required.
10
Ref. 24-30-01, 201
Battery power Connect
1. Connect the battery connector to the battery and lock with lockwire.
2. Install the battery cover on FL-215 and After, except FL-318.
3. Turn the Battery Switch to ON. Make sure the battery power system operates properly.
4. Install the access panel in the center wing section.
11
TEST
1. Perform the CONNECTING AND APPLYING EXTERNAL POWER procedure (
Ref. 24-40-00, 201).
2. Perform the TESTING AND TROUBLESHOOTING procedure for the NAV1/NAV2
system (Ref. Rockwell Collins, Inc. System Manual (523-0790063) for the King Air
Pro Line 21 Avionics System).
3. Perform the DISCONNECTING EXTERNAL POWER procedure (Ref. 24-40-00, 201
).
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Ref. 24-40-00, 201
Connecting & APPLYING EXTERNAL POWER
Caution: Voltage is required to energize the avionics master power relays to remove the power
from the avionics equipment, therefore, never apply external power to the airplane without
first applying battery voltage. If the battery switch is to be placed in the off position, connect
an external battery parallel to the external power unit prior to energizing the power unit.
The battery may be damaged if exposed to voltages higher than 32 volts for extended periods
of time.
1. Use only a ground power unit that is negatively grounded. If the polarity of the power
source is unknown, determine the polarity with a voltmeter before connecting the unit to
the airplane.
2. Before connecting an external power unit, turn all radio equipment, generator switches,
battery switch, and external power switch to the OFF position. Place the overhead
voltmeter select switch in the EXT PWR position.
13
Ref. 24-40-00, 201
Connecting & APPLYING EXTERNAL POWER
3. Adjust the voltage setting of the external power unit before connecting it into the
external power receptacle.
4. Connect external power unit cable to the external power unit receptacle on the airplane.
5. Turn the external power unit ON.
6. Monitor the voltage of the external power unit on the overhead meter panel voltmeter.
7. Turn the battery switch to the ON position.
8. Turn the external power switch in the cockpit to the ON position.
14
Ref. 24-40-00, 201
DISCONNECTING EXTERNAL POWER
1. Turn the external power switch in the cockpit to the OFF position.
2. Turn the battery switch to the OFF position.
3. Turn the external power unit OFF.
4. Disconnect the external power unit cable from the external power receptacle on the
airplane.
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