TM 55-1520-240-T
12-1.5 COPLT WSHLD HEAT CIRCUIT BREAKER WILL NOT STAY CLOSED
FAULT ISOLATION PROCEDURE
INITIAL SETUP
Applicable Configurations:
All
Tools:
Electrical Repairer’s Tool Kit,
NSN 5180-00-323-4915
Multimeter
Materials:
None
Personnel Required:
68F20 Aircraft Electrician
References:
TM 55-1520-240-23
Equipment Condition:
TM 55-1520-240-23:
Battery Disconnected
Electrical Power Off
Hydraulic Power Off
DID CB OPEN BEFORE CPLT
WINDSHIELD ANTI-ICE SW
SET TO ON?
YES
OPEN NOSE ACCESS DOOR.
REMOVE DYNAMIC ABSORBER,
DISCONNECT PLUG 083P1
FROM COPILOT’S WINDSHIELD
ANTI-ICING CONTROL BOX.
CHECK FOR GROUND ON PLUG
083P1 PIN E. IS GROUND
PRESENT?
YES
LOCATE GROUND FAULT ON
WIRE W558-18-16. W558-23.
12. OR W550-24-12 BETWEEN
PLUG 083P1 AND COPLT
WSHLD HEAT CB. REPAIR OR
REPLACE WIRE AS REQUIRED.
I
LOCATE GROUND FAULT ON
WIRE W558-22-12 BETWEEN
I
REPLACE COPILOT’S WIND.
I
COPILOTS WINDSHIELD AND
COPILOT ANTI-ICING RELAY.
SHIELD ANTI-ICING CONTROL
BOX.
REPAIR OR REPLACE WIRE AS
REQUIRED.
I
12-1.5
12-7
