TM 55-1520-240-T
9-18.3
MASTER CAUTION LIGHTS OPERATIONAL CHECK (Continued)
9-18.3
TASK
RESULT
1.
Check that LIGHTING CAUTION PNL circuit breaker
If CAUTION PNL circuit breaker (1) is open, close it. If it
(1) is closed.
opens again, go to task 9-18.4.
2.
Check pilot's and copilot's MASTER CAUTION lights
Both pilot's and copilots MASTER CAUTION lights (2 and 3)
(2 and 3) and master caution panel capsules.
and some capsules on master caution panel (4) shall come
on bright. If caution capsules do not come on, go to task
9-18.5 or 9-18.5.1. If pilots or copilot's MASTER CAUTION
lights do not come on, go to task 9-18.6. If master caution
panel capsules and MASTER CAUTION lights come on dim,
go to task 9-18.7. If one MASTER CAUTION light comes on
dim and one comes on bright, go to task 9-18.12. Without
74 if all capsules in rows 4, 7, and 12 are on or if all capsules
in remaining rows are on, replace master caution panel.
With 74 if all capsules in rows 4, 7, 12, and 16 are on or if all
capsules in remaining rows are on, replace master caution
panel. Repeat task 9-13.3.
3.
Press and release pilot's MASTER CAUTION light (2).
Both pilot's and copilot's MASTER CAUTION lights (2 and 3)
shall go out, lighted capsules on master caution panel (4)
shall remain on. If pilot's and copilot's master caution lights
remain on, go to task 9-18.8.
4.
Set and hold CAUTION LIGHTS (or LT) TEST switch(5)
All capsules on master caution panel (4) and MASTER
to TEST.
CAUTION lights (2 and 3) shall come on bright. If lights not
come on, go to task 9-18.8.
5.
Release CAUTION LIGHTS (or LT) TEST switch (5) to
Some capsules on master caution panel (4) shall go out. If
OFF.
none go out, replace CAUTION LIGHTS (or LT) TEST
switch.
6.
Open, then dose LIGHTING CAUTION PNL circuit
Both pilot and copilot MASTER CAUTION lights (2 and 3)
and some capsules on master caution panel (4) shall come
on bright. If pilot's or copilot’s MASTER CAUTION lights do
not come on, go to task 9-18.6.
7.
Momentarily set CAUTION LIGHTS (or LT) DIM/
Lighted capsules on master caution panel (4) and both
BRIGHT switch (6) to DIM.
MASTER CAUTION lights (2 and 3) shall dim, if not, go to
task 9-18.10.
8.
Momentarily set CAUTION LIGHTS (or LT) DIM/
Lighted capsules on master caution panel (4) and both
BRIGHT switch (6) to BRIGHT.
MASTER CAUTION lights (2 and 3) shall get bright. If not,
go to task 9-18.7.
9.
Momentarily set CAUTION LIGHTS (or LT) DIM/BRIGHT
switch (6) to DIM.
10.
Check that DOME SELECT or DOME switch (7) is at
If switch (7) is not at OFF, set it to OFF.
OFF.
11.
Check that LIGHTING COCKPIT DOME circuit breaker
If circuit breaker (8) is not dosed, close it. If it opens again,
(8) is closed.
go to task 9-14.3.
TASK
RESULT
12.
Set DOME SELECT switch (7) to WHITE.
Lighted capsules on master caution panel (4) and both
MASTER CAUTION lights (2 and 3) shall come on bright,
if not go to task 9-18.11.
13.
Press and release copilots MASTER CAUTION light
Both pilot's and copilot’s MASTER CAUTION lights (2 and 3)
(3).
shall go out. If not, go to task 9-18.8.
14.
Set DOME SELECT switch (7) to OFF.
Lighted capsules on master caution panel (4) and both
MASTER CAUTION lights (2 and 3) shall remain bright
FOLLOW-ON MAINTENANCE:
TM 55-1520-240-22:
Battery disconnected.
Electrical power off.
Hydraulic power off.
END OF TASK
Change 19 9-325
