• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
CARGO RAMP AND DOOR EMERGENCY CONTROL SYSTEM OPERATIONAL CHECK
RAMP   DOES   NOT   MOVE   DOWN   (RAMP   IN CLOSED   POSITION)

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
Page Navigation
  714    715    716    717    718  719  720    721    722    723    724  
TM 55-1520-240-T 7-3.4.1  CARGO RAMP AND DOOR EMERGENCY CONTROL SYSTEM OPERATIONAL CHECK (Continued) 7-3.4.1 TASK RESULT 1. Apply electrical and hydraulic power. 2. Perform cargo ramp and door manual operational check making sure cargo ramp and door are completely closed when finished. 3. Check that  RAMP EMER CONT circuit breaker (1)  is  closed  and  RAMP  PWR  switch  is  set  to OFF. 4. With RAMP PWR switch (2) set to ON, lift guard of RAMP EMER switch (3) and set switch to DN and UP. 5. Set RAMP PWR switch (2) to EMERG.  Check movement of ramp control valve handle (5). 6. Lift guard of RAMP EMER switch (3) and momentarily move switch to DN. 7. Lift  guard  of  RAMP  EMER  switch  (3)  and  momentarily  move  switch  to  DN  and  then  UP positions before releasing switch to the HOLD position. 8. Lift guard of RAMP EMER switch (3) and hold switch in DN position until ramp fully opens. Move     switch     to     UP     and     release     switch     when     ramp     is     at     a     level     position. Proper  ramp  and  door  operation  as  described  in  task  7-3.4,  must  be  achieved  prior  to  performing  the following checks and procedures. If RAMP EMER CONT circuit breaker (1) is open, close it. If it opens again, go to task 7-3.13. Ramp shall not move and condition of ramp control valve shall not change.  If handle to ramp control valve stiffens or operates, check wiring between RAMP PWR and RAMP EMER switches.  If switches are wired in accordance with wiring diagram with [65], replace RAMP PWR switch. Mechanism of handle (5) shall stiffen and resist movement.  Handle shall return to STOP (center) position if moved to either UP or DN position.  If ramp control valve does not operate as described, go to task 7-3.14. Spring  in  RAMP  EMER  switch  (3)  shall  return  switch  to  HOLD  position  when  switch  is  released.    Ramp control  valve  handle  (5)  shall  move  to  DN  position  and  ramp  system  shall  open  for  approximately  five seconds  in  proper  sequence  (cargo  door  retracts  and  ramp  moves  downward).    After  approximately  five seconds,  ramp  control  valve  handle  (5)  shall  return  to  STOP;  and,  ramp  shall  stop  opening  and  hold  its position.  If RAMP EMER switch,  ramp system, or control valve fail to operate properly, go to task 7-3.15. Ramp control valve handle (5) shall move to DN, UP and back to STOP positions.  Ramp shall open then stop before five seconds is complete.  If ramp system fails to operate properly go to task 7-3.15. Ramp control valve handle (5) shall move to DN position and ramp shall fall to the end of its travel.  When RAMP  EMER  (3)  switch  is  released,  ramp  control  valve  handle  shall  return  to  STOP  or  center  position. When RAMP EMER switch is moved and held in UP position, ramp control valve handle shall move to its UP  position  and  ramp  shall  close.    When  RAMP  EMER  switch  is  released,    ramp  shall  stop  and  hold  its position.  If ramp system fails to operate properly go to task 7-3.15. TASK RESULT 9. Lift switch guard of RAMP EMER switch (3) and hold When RAMP EMER switch (3) is held in UP switch in UP position until ramp and door are fully position, ramp shall close in proper sequence closed.  Place RAMP PWR switch (2) in OFF When  RAMP    EMER  switch  is  moved  to UP, position. ramp control valve handle  (5) shall move to its   UP   position   and   ramp   shall   close   with proper door extension.  If ramp control valve (4)   or   ramp      system   fail   to   operate   as described, go to task 7-3.15. END OF TASK Change 14  7-125







Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.