TM 55-1520-240-T
11-3.34.1 FORWARD LCT ACTUATOR OPERATIONAL CHECK
11-3.34.1
INITIAL SETUP
References:
Applicable Configurations:
TM 55-1520-240-23
All
Equipment Condition:
Tools:
TM 55-1520-240-23:
Digital Ohmmeter
Battery Connected
Electrical Power On
Materials:
Hydraulic Power On
None
Work Platform Open
Personnel Required:
Aircraft Electrician
Medium Helicopter Repairer
TASK
RESULT
1.
2.
3.
4.
5.
6.
7.
8.
Set cyclic trim switch (1) to MA N U A L p o -
sition.
Do not operate the LCT actuators
without hydraulic power on the
helicopter.
Using FWD (EXT-RET) switch (2), fully
retract the FWD LCT actuator (3).
Remove electrical power from the actua-
tor and disconnect the connector.
Using a digital ohmmeter, check pins A
and C of FWD actuator connection (Task
11-3.1).
Reconnect the actuator and apply electri-
cal power.
Using FWD (EXT-RET) switch (2), fully
extend the FWD LCT actuator (3).
Remove electrical power from the actua-
tor and disconnect the connector.
Using a digital ohmmeter, check pins B
and C of FWD actuator connection (Task
11-3.1).
TASK
RESULT
9.
10.
11.
12.
Circuit should show open.
13.
14.
15.
Reconnect the actuator and apply electri-
cal power.
Using FWD (EXT-RET) switch (2), operate
the FWD actuator from full extend to full
retract. Clock the travel time.
Using FWD (EXT-RET) switch (2), operate
the FWD actuator from full retract to full
extend. Clock the travel time.
Manually operate the actuator to full re-
tract.
Move cyclic trim switch (1) to AUTO.
Perform an AFCS BITE TEST on the No. 1
and No. 2 systems (Task 11-3.3).
Monitor the cockpit LCT indicator (4).
Time must not exceed 25 seconds.
Time must not exceed 25 seconds
If acceptable FWD actuator operation is not obtained
in all preceding steps, replace defective actuator (TM
55-1520-240-23).
Cockpit LCT indicator (4) should show GND.
Failure of any AFCS BITE steps for LCT operation
indicates possible actuator defects, Replace defec-
tive actuator (TM 55-1520-240-23),
Erratic indicator movement indicates possible actua-
tor defect. Replace defective actuator (TM 55-1520-
240-23).
FOLLOW-ON MAINTENANCE:
Circuit should show open.
TM 55-1520-240-23:
Hydraulic power off.
Electrical power off.
Battery disconnected.
Work platform closed.
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Change 10
11-132.1