TM 55-1520-240-T
12-1.3 WINDSHIELD ANTI-ICING SYSTEM OPERATIONAL CHECK
(Continued)
T A S K
R E S U LT
T A S K
R E S U LT
CHECK COPILOTS WINDSHIELD
ANTI-ICING
1. Check that C O P L T W S H L D C O N T a nd
COPLT WSH LD HEAT circuit breakers
(1 and 2) are closed.
2. Set
CPLT
WINDSHIELD
anti-ice
switch
(3) to ON. Touch copilots windshield
( 4 ).
3. S e t C P L T W I N D S H I E L D a n t i - i c e s w i t c h
(3) to OFF. Touch copilots windshield
( 4 ).
C H E C K C E N T E R W I N D S H I E LD
A N T I - I C I N G
4. C h e c k that C T R W S H L D A N T I - I CE
C O N T a n d C T R W S H L D A N T I - I CE
HEAT circuit breakers (5 and 6) a r e
closed.
5. S e t C T R W I N D S H I E L D a n t i - i c e s w i t ch
(7) to ON. Touch center windshield (8).
6. Set
CTR
WINDSHIELD
anti-ice
switch
(7) to OFF. Touch center windshield (8).
If COPLT WSHLD CONT or COPLT WSHLD HEAT
circuit breaker (1 or 2) is open, close it. If COPLT
WSHLD CONT circuit breaker opens again, go to
task 12-1.4. If COPLT WSHLD HEAT circuit
breaker opens again, go to task 12-1.5.
Copilots windshield (4) shall begin to get warm
and heat up before automatic heat cycling
begins. If windshield does not get warm, go to
task 12-1-6. If windshield temperature does not
cycle replace copilots windshield anti-icing con-
trol box.
Copilots windshield (4) shall stop heating. If it
continues to heat, go to task 12-1.7.
If CTR WSHLD ANTI-ICE CONT or CTR WSHLD
ANTI-ICE HEAT circuit breaker (5 or 6) is open,
close it. If CTR WSHLD ANTI-ICE CONT circuit
breaker opens again, go to task 12-1.8. If CTR
WSHLD ANTI-ICE HEAT circuit breaker opens
again, go to task 12-1.9.
Center windshield (8) shall begin to get warm and
heat up before automatic heat cycling begins. If
windshield does not get warm, go to task 12-
1.10. If windshield temperature does not cycle,
replace center windshield anti-icing control box.
Center windshield (8) shall stop heating. If it
continues to heat, go to task 12-1.11.
12-1.3
C H E C K P I L O T S W I N D S H I E L D
A N T I - I C I NG
7.
8.
9
C h e c k that P I L O T W S H L D A N T I - I CE
C O N T A N D P I L O T W S H L D A N T I - I C E
HEAT circuit breakers (9 and 10) a r e
closed.
Set
PLT
WINDSHIELD
anti-ice
switch
(11) to ON. Touch pilots windshield
( 1 2 ).
Set
PLT
WINDSHIELD
anti-ice
switch
(11) to OFF. Touch pilots windshield
( 1 2 ).
If PILOT WSHLD ANTI-ICE CONT or PILOT
WSHLD ANTI-ICE HEAT circuit breaker (9 or 10)
is open, close it. If PILOT WSHLD ANTI-ICE CONT
circuit breaker opens again, go to task 12-1.12. If
PILOT WSHLD ANTI-ICE HEAT circult breaker
opens again, go to task 12-1.13.
Pilots windshield (12) shall begin to get warm
and heat up before automatic heat cycling
begins. If windshield does not get warm, go to
task 17-7 14. If winshield temperature does not
cycle, replace pilots windshield anti-icing control
box.
Pilots windshield (12) shall stop heating. If it
continues to heat, go to task 12-1.15.
FOLLOW-ON MAINTENANCE:
T M 5 5 - 1 5 2 0 - 2 4 0 - 2 3:
Electrical Power Off
Battery Disconnected
END OF TASK
12-5