TM 1-1520-238-T-7
11–326
11–81.
COLL ACTUATOR NO-GO – APPEARS ON HOD
11–81
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
References:
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
R295 door open
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. Check for 1800 to 2200 ohms between P688–59
and P688–60.
Is resistance present?
YES
Go to step 3.
NO
Go to step 2.
2. Check for open between:
P228–5 and P688–59,
P228–4 and P688–60.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–23.
NO
Replace collective servocylinder
(TM 1-1520-238-23).
3. Check for 90 to 100 ohms between:
(ACA) P683–112 and P493–B10.
(ACB) P683–112 and ground.
Is resistance present?
YES
Go to step 5.
NO
Go to step 4.
4. Check for open between:
P683–112 and P228–2.
(ACA) P228–9 and P493–B10.
(ACB) P228–9 and ground.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–23.
NO
Replace collective servocylinder
(TM 1-1520-238-23).
5. Check for 90 to 100 ohms between P683–108
and P683–107.
Is resistance present?
YES
Go to step 7.
NO
Go to step 6.
6. Check for open between:
P683–108 and P228–10,
P683–107 and P228–11.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–23.
NO
Replace collective servocylinder
(TM 1-1520-238-23).
7. Check for 364 to 424 ohms between P688–29
and P688–30.
Is resistance present?
YES
Go to step 9.
NO
Go to step 8.
