TM 55-1520-240-T
9-14.3 COCKPIT DOME AND UTILITY LIGHTS OPERATIONAL CHECK
9-14.3
INITIAL SETUP
References:
TM 55-1520-240-23
Applicable Configurations:
Equipment Condition:
TM 55-1520-240-23:
None
Battery Connected
Electrical Power On
Materials:
Hydraulic Power Off
None
Cockpit Dome and Utility Lights Visual Check Per-
Personnel Required:
formed (Task 9-14.2)
Aircraft Electrician
TASK
RESULT
1.
2.
3.
4.
5.
6.
7.
8.
9.
Check that LIGHTING COCKPIT DOME cir-
cuit breaker (1) is closed.
Set DOME SELECT switch (2) to WHITE.
Turn DOME LIGHTS control (3) from OFF
through DIM to BRT.
Turn DOME LIGHTS control (3) to OFF.
Set DOME SELECT switch (2) to RED.
Turn DOME LIGHTS control (3) from OFF
through DIM to BRT.
Turn DOME LIGHTS control (3) to OFF.
Set DOME SELECT switch (2) to OFF.
Remove pilot’s utility light from overhead
panel bracket. Press and release switch (4).
Turn dimming control (5) through its
range.
Stow pilot’s utility light.
Perform steps 7 and 8 with copilot’s utility light.
If COCKPIT DOME circuit breaker (1) is open, close
it. If it opens again, go to task 9-14.4.
White light in both dome lights shall come on and
increase in brightness as control (3) is turned to
BRT. If any dome light is not lit, go to task 9-14.5. If
brightness does not increase, replace DOME LIGHTS
control (3).
Dome lights shall go out. If lights are still on, replace
DOME LIGHTS control (3).
Red light in both dome lights shall come on and in-
crease in brightness as control (3) is turned to BRT.
If any dome light is not lit, go to task 9-14.6. If
brightness does not increase, replace DOME LIGHTS
control (3).
Dome lights shall go out. If lights are still on, replace
DOME LIGHTS control (3).
Utility light shall blink when switch (4) is pressed and
released. Utility light shall increase in brightness as
dimming control (5) is turned. If utility light does not
come on, go to task 9-14.7. If light comes on but
does not increase in brightness, replace utility light.
FOLLOW-ON MAINTENANCE:
TM 55-1520-240-23:
Battery Disconnected
Electrical Power Off
9-250/(9-251 blank)
Change 2
