TM 55-1520-240-T12-1.3 WINDSHIELD ANTI-ICING SYSTEM OPERATIONAL CHECK(Continued)T A S KR E S U LTT A S KR E S U LTCHECK COPILOTS WINDSHIELDANTI-ICING1. Check that C O P L T W S H L D C O N T a ndCOPLT WSH LD HEAT circuit breakers(1 and 2) are closed.2. Set CPLT WINDSHIELD anti-ice switch(3) to ON. Touch copilot’s 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 copilot’s windshield( 4 ).C H E C K C E N T E R W I N D S H I E LDA N T I - I C I N G4. C h e c k that C T R W S H L D A N T I - I CEC O N T a n d C T R W S H L D A N T I - I CEHEAT circuit breakers (5 and 6) a r eclosed.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 HEATcircuit breaker (1 or 2) is open, close it. If COPLTWSHLD CONT circuit breaker opens again, go totask 12-1.4. If COPLT WSHLD HEAT circuitbreaker opens again, go to task 12-1.5.Copilot’s windshield (4) shall begin to get warmand heat up before automatic heat cyclingbegins. If windshield does not get warm, go totask 12-1-6. If windshield temperature does notcycle replace copilot’s windshield anti-icing con-trol box.Copilot’s windshield (4) shall stop heating. If itcontinues to heat, go to task 12-1.7.If CTR WSHLD ANTI-ICE CONT or CTR WSHLDANTI-ICE HEAT circuit breaker (5 or 6) is open,close it. If CTR WSHLD ANTI-ICE CONT circuitbreaker opens again, go to task 12-1.8. If CTRWSHLD ANTI-ICE HEAT circuit breaker opensagain, go to task 12-1.9.Center windshield (8) shall begin to get warm andheat up before automatic heat cycling begins. Ifwindshield 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 itcontinues to heat, go to task 12-1.11.12-1.3C H E C K P I L O T ’ S W I N D S H I E L DA N T I - I C I NG7.8.9C h e c k that P I L O T W S H L D A N T I - I CEC O N T A N D P I L O T W S H L D A N T I - I C EHEAT circuit breakers (9 and 10) a r eclosed.Set PLT WINDSHIELD anti-ice switch(11) to ON. Touch pilot’s windshield( 1 2 ).Set PLT WINDSHIELD anti-ice switch(11) to OFF. Touch pilot’s windshield( 1 2 ).If PILOT WSHLD ANTI-ICE CONT or PILOTWSHLD ANTI-ICE HEAT circuit breaker (9 or 10)is open, close it. If PILOT WSHLD ANTI-ICE CONTcircuit breaker opens again, go to task 12-1.12. IfPILOT WSHLD ANTI-ICE HEAT circult breakeropens again, go to task 12-1.13.Pilot’s windshield (12) shall begin to get warmand heat up before automatic heat cyclingbegins. If windshield does not get warm, go totask 17-7 14. If winshield temperature does notcycle, replace pilot’s windshield anti-icing controlbox.Pilot’s windshield (12) shall stop heating. If itcontinues 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 OffBattery DisconnectedEND OF TASK12-5
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