TM 1-1520-238-T-6
9–471
9–210. ECS CANOPY ANTI-ICE CONTR CIRCUIT BREAKER (CB70) – DOES NOT STAY
9–210
CLOSED OR 28 VDC IS NOT PRESENT AT P1-3
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
References:
TM 1-1520-238-23
TM 1-1520-238-T-8
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. On pilot ELEC PWR panel, set BATT/EXT PWR
switch to EXT PWR.
Does ECS CANOPY ANTI-ICE CONTR circuit
breaker (CB70) stay closed?
YES
Go to step 2.
NO
Go to step 3.
2. Set BATT/EXT PWR switch to OFF. Check for
open between:
CB70-1 and CB6-1,
CB70-2 and P1-3.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–206.
NO
Replace ECS CANOPY
ANTI-ICE CONTR circuit
breaker (CB70)
(TM 1-1520-238-23).
3. Open CB70 and set BATT/EXT PWR switch to
OFF. Check for short between P1-3 and ground.
Does short exist?
YES
Go to step 4.
NO
Refer to TM 1-1520-238-T-8 to
troubleshoot canopy defog and
anti-ice.
4. Detach wire at CB70-2. Check for short between
P1-3 and ground.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 9–206.
NO
Replace ECS CANOPY
ANTI-ICE CONTR circuit
breaker (CB70)
(TM 1-1520-238-23).
END OF TASK
