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NO.  2  AFCS  COMPUTER  BITE  SWITCH  DOES  NOT  LIGHT  AND  COUNTER  DOES  NOT  STEP  WHEN 11-3.34 BITE SWITCH IS PRESSED AND RELEASED
FORWARD  LCT  ACTUATOR  OPERATIONAL  CHECK  (Continued)

TM-55-1520-240-T-3 CH-47D Heilcopter Manual
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TM  55-1520-240-T 11-3.34.1  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. GO  TO  NEXT  PAGE Change 10 11-132.1







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