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Table 11-2. Function and Designation Letters
CIRCUIT
DESIGNATION
LETTER
CIRCUITS
A
ARMAMENT:
Bomb suspension & release
Guns
Chemical
Rocket
Sight
Turret
Warning
External pylons & stores
Jettison fuel tanks
Mine dispenser
B
PHOTOGRAPHIC:
Gun camera
Mapping camera
Reconnaissance
Camera intervalometer
Camera doors
Camera heaters
Warning
C
CONTROL SURFACE:
Horizontal stabilizer
Warning
D
INSTRUMENT (other than flight
or engine instruments):
Ammeter
Air pressure
Free air temperature
Hydraulic pressure
Horizontal position stabilizer
Voltmeter
Clock
Warning
E
ENGINE INSTRUMENT:
Tailpipe temperature
Fuel flow
Fuel quantity
Fuel capacity
Oil temperature
Oil pressure
Manifold pressure
Fuel pressure
Engine oil quantity
Tachometer
Warning
CIRCUIT
camera
ELECTRICAL AND AVIONICS SYSTEM
DESIGNATION
LETTER
CIRCUITS
F
FLIGHT INSTRUMENT:
Bank and turn
Rate of climb
Directional gyro
Air position
Ground position
Compass (including flux gate
and other stabilized
compasses)
Gyro horizon
Attitude gyro
Driftmeter
Altimeter
Airspeed
Accelerometer
Pitot-static tube meter
Warning
H
HEATING, VENTILATING, AND
DE-ICING:
Anti-icing (general)
Battery heater
Cabin heater
Cigarette lighter
De-icing (general)
Windshield defroster
Windshield defogger
Windshield de-icer
Heater blanket
Oil immersion heater
Refrigeration
Ventilation
Warning
I
In order to avoid confusion with
the numeral one, the letter "I"
shall not be used for circuit or
cable identification.
J
IGNITION:
Booster
Vibrator
Distributor
Electronic
Warning
TM 55-1520-228-BD
11-3
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