TM   55-1520-240-T 11-3.34.2   AFT   LCT   ACTUATOR   OPERATIONAL   CHECK 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 TASK RESULT 1. 2. 3. 4. 5. 6. 7. 8. Set  cyclic  trim  switch  (1)  to  manual  position. Do   not   operate   the   LCT manually    without    hydraulic the    helicopter. actuators power   on Using  AFT  (EXT-RET)  switch  (2),  fully  retract the   AFT   LCT   actuator. Remove   electrical   power   from   the   actuator and   disconnect   the   connector. Using   a   digital   ohmmeter,   check   pins   A   and Circuit  should  show  open. C   of   AFT   actuator   connection   (TASK   11-3.1). Reconnect  the  actuator  and  apply  electrical power. Using   AFT   (EXT-RET)   switch   (2),   fully   extend the  AFT  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. C   of   AFT   actuator   connection   (TASK   11-3.1). 11-134.4 Change  4 TASK RESULT 9. 10. 11. 12. 13. 14. 15. Reconnect  the  actuator  and  apply  electrical power. Using   AFT   (RET-EXT)   switch   (2),   operate   the AFT   actuator   (3)   from   full   extend   to   full retract.  Clock  the  travel  time. Using   AFT   (RET-EXT)   switch   (2),   operate   the AFT   actuator   (3)   from   full   retract   to   full   ex- tend.   Clock   the   travel   time. Manually   operate   the   actuator   to   full retract. Move  cyclic  trim  switch  (1)  to  AUTO. Perform  an  AFCS  BITE  TEST  on  the  No. No.  2  systems  (TASK  11-3.3). Monitor   the   cockpit   LCT   indicator   (4). 1 and Time must not exceed 25 seconds. Time must not exceed 25 seconds. If acceptable AFT 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 defect. Replace defective ac- tuator  (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