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FORWARD  LCT  ACTUATOR  OPERATIONAL  CHECK  (Continued)
AFT  LCT  ACTUATOR  OPERATIONAL  CHECK  (Continued)

TM-55-1520-240-T-3 CH-47D Heilcopter Manual
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TM  55-1520-240-T 11-3.34.2  AFT  LCT  ACTUATOR  OPERATIONAL  CHECK 11-3.34.2 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 TASK RESULT 1. 2. 3. 4. 5. 6. 7. 8. Set   cyclic   trim   switch   (1)   to   MANUAL   po- sition. Do   not   operate   the   LCT   actuators without  hydraulic  power  on  the helicopter. Using   AFT   (EXT-RET)   switch   (2),   fully   re- tract  the  AFT  LCT  actuator  (3). Remove  electrical  power  from  the  actua- tor   and   disconnect   the   connector. Using   a   digital   ohmmeter,   check   pins   A and   C   of   AFT   actuator   connection   (Task 11-3.1). Reconnect   the   actuator   and   apply   electri- cal   power. Using   AFT   (EXT-RET)   switch   (2),   fully   ex- tend  the  AFT  LCT  actuator  (3). Remove  electrical  power  from  the  actua- tor   and   disconnect   the   connector. Using  a  digital  ohmmeter,  check  pins  B and   C   of   AFT   actuator   connection   (Task 11-3.1). 9. 10. 11. 12. Circuit  should  show  open. 13. 14. 15. Reconnect  the  actuator  and  apply  electri- cal   power. Using   AFT   (EXT-RET)   switch   (2),   operate the   AFT   actuator   (3)   from   full   extend   to full   retract.   Clock   the   travel   time. Using   AFT   (EXT-RET)   switch   (2),   operate the   AFT   actuator   (3)   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   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 indicates   possible   actuator   defect.   Replace   defective actuator    (TM    55-1520-240-23). Erratic   indicator   movement   indicates   possible   actua- tor   defect.   Replace   defective   actuator   (TM   55-1520- 240-23). Circuit  should  show  open. FOLLOW-ON   MAINTENANCE: TM    55-1520-240-23: Hydraulic   power   off. Electrical   power   off. Battery    disconnected. Work   platform   closed. GO  TO  NEXT  PAGE Change 10 11-132.3







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