TM 55-1520-240-T
9-12.8 CONSOLE PANEL LIGHTS OPERATIONAL CHECK (Continued)
9 - 1 2 .8
TASK
RESULT
CHECK CONSOLE PANEL LIGHTS
1.
2.
3.
4.
5.
6.
Check that CONSOLE circuit breaker (1) is
closed.
Check that ILLUM SW PWR circuit break-
er (2) is closed.
Turn CTR CSL control (3) from OFF
through DIM to BRT.
Turn STICK POSN IND control (4) from
OFF through DIM to BRT.
Turn CTR CSL control (3) to OFF.
Turn STICK POSN IND control (4) to OFF.
If CONSOLE circuit breaker (1) is open, close it. If it
opens again, go to task 9-12.9.
If ILLUM SW PWR circuit breaker (1) is open, close
it. If it opens again, go to task 9-12.10.
All console panels shall come on dim and increase in
brightness as control (3) is turned to BRT. If any
panel is not lit, go to task 9-12.11. If panel bright-
ness does not increase, replace CTR CSL control. If
only one light is out, replace that light.
Longitudinal stick indicator (5) shll come on dim and
increase in brightness as control (4) is turned to
BRT. If indicator (5) is not lit, go to task 9-12.12. If
indicator brightness does not increase above dim,
replace STICK POSN IND control (4).
All console panel lights shall go out. If they do not,
replace CTR CSL control (3).
Longitudinal stick indicator (5) shall go out. If it does
not, replace STICK POSN IND control (4).
TASK
RESULT
CHECK ILLUMINATED SWITCHES
7.
8.
9.
10.
11.
12.
13.
14.
Set SYS SEL switch (6) on AFCS panel to
OFF.
Set PLT INST lights control (7) to OFF.
Press and hold BARO ALT switch (8).
Release BARO ALT switch (8).
Set PLT INST lights control (7) to ON.
Press and hold RAD ALT switch (9).
Set Pilot inst lights control (7) to OFF.
Release RAD ALT switch (9).
Caption on BARO ALT switch (8) shall light bright. If
it does not come on, go to task 9-12.13.
Caption on BARO ALT switch (8) shall go out.
Caption on RAD ALT switch (9) shall light dim. If it
does not light dim, go to task 9-12.14.
Caption on RAD ALT switch (9) shall light bright.
FOLLOW-ON MAINTENANCE:
TM 55-1520-240-23:
Electrical Power Off
Battery Disconnected
END OF TASK
Change 2
9-228.3
