TM 55-1520-240-23-7
9-60
LIGHTING SYSTEMS
(Continued)
9-60
CONSOLE LIGHT SYSTEM WITH 17
Description
The console lighting system provides controlled 28
vac and 5 vac to the panel lights in the console. It
also provides controlled 3 volt or 5 vac to the lighted
switches in the console and the instrument panels. The
system includes the CTR CSL control and a STICK
POSN IND control on the overhead panel, and three
autotransformers in the console.
Operation
Power for console lighting system comes from the
115 volt No.1 ac bus. When CONSOLE LIGHTING
circuit breaker is closed, 115 vac is applied to the
CTR CSL LTG control and the STICK POSN IND
LTG controls. When turned from OFF, the STICK
POSN IND LTG control supplies controlled 115 vac to
the indicator. When turned from OFF, the CTR CSL
LTG control supplies controlled 115 vac to a 115-28
volt autotransformer. The autotransformer supplies
controlled 28 vac to a 28 volt autotransformer and to
14 control panels: ILS, UHF, APR 39, ADF RCVR,
HF, IFF, EMER ENG TRIM, TSEC/KY-28, STEERING
CONTROL, two VHF, and three COMM. The 26-5 volt
autotransformer supplies controlled 5 vac to four panels:
DPLR NAV, DISP CONT, AFCS, and MPS (ALQ-156).
When the ILLUM SW PWR circuit breaker is closed, 115
vac is connected to an autotransformer with 5 volt and 3
volt outputs. The illuminated pushbutton lights dimming
relay 232K3 selects one of these for the lighted switches
in the AFCS and mode select panels (not shown).
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