TM 55-1520-240-T
11-3.34.1 FORWARD LCT ACTUATOR OPERATIONAL CHECK
TASK
RESULT
INITIAL SETUP
Personnel Required:
Aircraft Electrician
Applicable Configurations:
Medium Helicopter Repairer
All
References:
Tools:
TM 55-1520-240-23
Digital Ohmmeter
Equipment Condition:
Materials:
TM 55-1520-240-23
None
Battery Connected
Electrical Power On
Hydraulic Power On
Work Platform Open
1.
2.
3.
4.
5.
6.
7.
8.
Set cyclic trim switch (1) to MANUAL posi-
tion.
Do not
operate the LCT actuators
manually without hydraulic power on
the helicopter.
Using FWD (EXT-RET) switch (2), fully retract
the FWD LCT actuator (3).
Remove electrical power from the actuator
and disconnect the connector.
Using a digital ohmmeter, check pins A and
Circuit should show open.
C of FWD actuator connection (TASK 11-3.1).
Reconnect the actuator and apply electrical
power.
Using FWD (EXT-RET) switch (2), fully extend
the FWD LCT actuator (3).
Remove electrical power from the actuator
and disconnect the connector.
Using a digital ohmmeter, check pins B and
Circuit should show open.
9.
10.
11.
12.
13.
14.
15.
Reconnect the actuator and apply electrical
power.
Using FWD (EXT-RET) switch (2), operate the
FWD actuator from full extend to full
retract. Clock the travel time.
UsiIYg FWD (EXT-RET) switch (2), operate the
FWD actuator from full retract to full ex-
tend. Clock the travel time.
Manuall operate
t h e a c t u a t o r t o f u ll
retract.
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 in-
dicates possible actuator defects. Replace defective
actuator (TM 55-1520-240-23).
Erratic indicator movement indicates possible actuator
defect. Replace defective actuator (TM 55-1520-240-
23).
FOLLOW-ON MAINTENANCE
TM 55-1520-240-23
Hydraulic Power Off
Electrical Power Off
Battery Disconnected
Work Platform Closed
GO TO NEXT PAGE
C of FWD actuator connection (TASK 11-3.1).
11-134.2
Change 4