TM 55-1520-228-BD
ELECTRICAL AND AVIONICS SYSTEM
Table 11-2.
Function and Designation Letters (Cont)
CIRCUIT
CIRCUIT
DESIGNATION
DESIGNATION
CIRCUITS
LETTER
CIRCUITS
K
ENGINE CONTROL:
Blower ratio
Starter
Warning
L
LIGHTING:
Approach
Flasher-coder
Cockpit
Drift
Cabin
Formation
Cargo
Interior
Instrument
Section (fuselage)
Landing
Exterior
Running, position, navigation
Passing
Search
Taxi
Warning
M
MISCELLANEOUS ELECTRIC:
Windshield spray
Windshield wiper
Hoist
Enclosure operation
Positioner; seat, pedal
Special test equipment
N
UNASSIGNED
O
In order to avoid confusion
with the numeral zero, the
letter "O" shall not be used
for circuit or cable identi-
fication.
P
DC POWER
Q
FUEL AND OIL:
Fuel valves
Fuel booster-pump motor
Moisture control
Oil dilution
Engine primer
Fuel-transfer-pump motor
and control
Fuel-loading-pump motor
0il transfer-pump motor
and control
Oil booster pump
Oil scavenge pump
Throttle control
Fuel-pump motor
Oil diverter
Oil valves
Warning
R
RADIO (Navigation and
communication):
RA-Instrument landing
RC-Command
RD-Radio direction finding
RF-VHF liaison
RH-Homing
RL-Liaison
RM-Marker beacon
RN-Navigation
RP-Special systems
RS-SHF command
RT-Radio teletype
RU-UHF command
RV-VHF command
RX-Recorder
RZ-Interphone, headphone
11-4
LETTER
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