TM 55-1520-240-T
9-13.12 SECONDARY COCKPIT LIGHTS OPERATIONAL CHECK (Continued)
9 - 1 3 . 12
TASK
RESULT
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Check that INSTR FLOOD LIGHTING cir-
cuit breaker (1) is closed.
Check that DC BUS CONT NO. 1 circuit
breaker (2) is closed.
Check that CKPT DIM CONT LIGHTING
circuit breaker (3) is closed.
Set PLT INST lights control (4) to DIM.
Set INST and OVHD FLOOD lights
switches (5 and 6) to ON.
Turn FLOOD lights control (7) from OFF
through DIM to BRT.
Set INST FLOOD lights switch (5) to OFF.
Set OVHD FLOOD lights switch (6) to
OFF.
Open NO. 1 DC BUS CONT circuit breaker
(2).
Turn PLT INST lights control (4) to OFF.
Close NO. 1 DC BUS CONT circuit breaker
(2).
If circuit breaker (1) is open, close it. If it opens
again, go to task 9-13.13.
If circuit breaker (2) is open, close it. If it opens
again, go to task 9-13.5.
If circuit breaker (3) is open, close it. If it opens
again, go to task 9-13.14.
Eight flood lights, six on instrument panel and two
behind pilot’s seat shall come on dim and then in-
crease in brightness. If flood lights do not come on,
go to task 9-13.15. If flood lights do not increase in
brightness, replace FLOOD lights control (7).
Six flood lights on instrument panel shall go out. If
flood lights do not go out, replace switch (5).
Two flood lights behind pilot’s and copilot’s seat
shall go out. If flood lights do not go out, replace
switch (6).
All eight flood lights shall come on. If not, go to task
9-13.16.
Flood lights and indicator lights shall go out. If not,
replace PLT INST lights control (4).
FOLLOW-ON MAINTENANCE:
TM 55-1520-240-23:
Battery Disconnected
Electrical Power Off
Hydraulic Power Off
END OF TASK
Change 2
9-246.3
