TM 1-1520-238-T-7
11–117
11–14.
FORCE TRIM – DOES NOT DISENGAGE
11–14
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Extractor, Relay
CTJ-RO6
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
L200 access panel –
pilot and CPG
cyclic stick covers
and angle plates –
B60 access panel –
electrical power
distribution box
forward cover
removed
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. Verify pilot FORCE TRIM switch is set to OFF.
With relay (A402)XK1–9/10 removed, check for
28 VDC at (A402)K1–9/10–X1.
Is voltage present?
YES
Go to step 2.
NO
Go to step 4.
2. Check for open between (A402)K1–9/10–X2 and
ground.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–12.
NO
Go to step 3.
3. Check for 28 VDC at J1047–A,
J1048–A, and J1049–A.
Is voltage present?
YES
Replace relay (A402)K1–9/10
(TM 1-1520-238-23).
NO
Replace magnetic brakes:
Lateral (roll) – J1047–A,
Directional (yaw) – J1048–A,
Longitudinal (pitch) – J1049–A
(TM 1-1520-238-23).
4. Check for 28 VDC at (A402)TB2–28–J.
Is voltage present?
YES
Repair open wire between
(A402):
TB–28–J and K1–9/10–X1.
Go to paragraph 11–12.
NO
Go to step 5.
5. Detach P423. Check for 28 VDC at
(A402)J11–B7.
Is voltage present?
YES
Go to step 9.
NO
Go to step 6.
6. Detach P441. Check for 28 VDC at P441–B10.
Is voltage present?
YES
Go to step 7.
NO
Go to step 8.
