TM 55-1520-240-T
9-13.3 SECONDARY COCKPIT LIGHTS OPERATIONAL CHECK (Continued)
9-13.3
TASK
RESULT
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Check that INSTR FLOOD LIGHTING
circuit breaker (1) is closed.
Check that DC BUS CONT NO. 1 circuit
breaker (2) is closed.
Set PILOT FLT INST LTS control (3) to
OFF.
Set INST PNL CONSOLE, and OVHD
PNL FLOOD LTS switches (4, 5, and 6)
to ON.
Turn FLOOD LTS control (7) from OFF
through DIM to BRT.
Set INST PNL FLOOD LTS switch (4) to
OFF.
Set CONSOLE FLOOD LTS switch (5) to
OFF.
Set OVHD PNL FLOOD LTS switch (6)
to OFF.
Open NO. 1 DC BUS CONT circuit
breaker (2). Sat INST PNL switch (4) to
ON.
Set INST PNL switch (4) to OFF.
Turn PILOT FLT INST LTS control (3) to
BRT.
If circuit breaker (1) is open, close it. If it opens
again, go to task 9-13.4.
If circuit breaker (2) is open, close it. If it opens
again, go to task 9-13.5.
Ten flood lights, eight on instrument panel and
two behind pilots seat shall come on dim and
then increase in brightness. If flood lights do not
come on go to task 9-13.6. If flood lights do not
increase in brightness, replace FLOOD LTS control
(7).
Six flood lights on instrument panel shall go out. If
flood lights do not go out, go to task 9-13.7.
Two flood lights over center panel shall go out. If
flood lights do not go out, replace switch (5).
Two flood lights behind pilots and copilots seat
shall go out. If flood lights do not go out, replace
switch (6).
Six flood lights on instrument panel and pilots and
copilots turn and slip indicators (8) lights shall
come on. If flood lights and pilots and copilots
turn and slip lights do not come on, go to task 9-
13.8.
Flood lights and pilots and copilots turn and slip
indicator (8) lights shall go out. If flood lights and
indicator lights do not go out, replace switch (4).
Overhead panel flood lights, instrument panel
flood lights, and pilots and copilots turn and slip
indicator lights shall come on. If not, go to task 9-
13.9.
TASK
RESULT
12. Turn PILOT FLT INST LTS control (3) to
Flood lights and indicator lights shall go out. If not
OFF.
replace PILOT FLT INST LTS control (3).
13. Close NO. 1 DC BUS CONT circuit
breaker (2).
FOLLOW-ON MAINTENANCE:
TM 55-1520-240-23:
Battery Off
Electrical Power Off
Hydraulic Power Off
END OF TASK
9-233