TM 55-1520-240-T
4-6.4 ENGINE NO. 1 TRIM CIRCUIT BREAKER WILL NOT STAY CLOSED (Continued)
4 - 6 .4
REMOVE COPILOT’S FLOOR
PANEL. DISCONNECT CO-
PILOT’S THRUST GRIP
PLUG. CHECK FOR GROUND
ON TB 18 TERM 12. IS
GROUND PRESENT?
4-126
YES
REMOVE PILOT’S FLOOR
PANEL. DISCONNECT Pl-
LOT’S THRUST GRIP PLUG.
CHECK FOP. GROUND ON TB
18 TERM 12. IS GROUND
PRESENT?
YES
OPEN LEFT ELECTRICAL
COMPARTMENT. REMOVE
WIRE FROM RELAY 103K1
TERM X1. IS GROUND PRE-
SENT ON WIRE?
NO
CHECK FOR GROUND ON
RELAY 103K1 TERM X1. IS
GROUND PRESENT?
NO
REPAIR OR REPLACE CO-
PILOT’S THRUST GRIP.
REPAIR OR REPLACE Pl-
LOT’S THRUST GRIP.
LOCATE GROUND FAULT
BETWEEN 103K1, 300J26,
AND 300J21 ON WIRES
YES
W696-43-22 OR W696-48-
22 OR W645-314-22 OR
W591 -26-22. REPAIR OR
REPLACE WIRE AS RE-
QUIRED.
DISCONNECT WIRE FROM
RELAY 103K1 TERM A2. IS
GROUND PRESENT?
DISCONNECT PLUG 103P1
AT NO. 1 ENGINE CONTROL
BOX. CHECK FOR GROUND
ON PLUG 103P1 PIN A. IS
GROUND PRESENT?
REPLACE RELAY 103K1.
REPLACE RELAY 103K1.
Change 2
LOCATE GROUND FAULT
ON WIRE W591-25-22 BE-
TWEEN PLUG 103P1 AND
RELAY 103K1. REPAIR OR
REPLACE WIRE AS RE-
QUIRED.
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