Electrical/Electronic Drawings, Continued
Aircraft wire
identification
coding
(Continued)
The following list shows circuit function codes for aircraft wiring:
Letter
Function
A
Armament
B
Photographic
C
Control surface
D
Instrument
E
Engine instrument
F
Flight instrument
G
Landing gear
H
Heating, ventilating, and deicing
J
Ignition
K
Engine control
L
Lighting
M
Miscellaneous
P
DC power- dc power or power control system
Q
Fuel and oil
R
Radio (navigation and communications), RN-
navigation, RP-intercommunications, RZ-
interphones, headphones
S
Radar, SA-altimeter, SN-navigation, SQ-track, SR-
recorder, SS-search
T
Special electronic, TE-countermeasures, TN-
navigation, TR-receivers, TX-television transmitters,
TZ-computers
Continued on next page
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