TM 55-1520-240-T 7-3.4 CARGO RAMP AND DOOR MANUAL OPERATIONAL CHECK (Continued) 7-3.4 TASK RESULT TASK RESULT 1. Check apu start accumulator gage (1). 2. Turn EMERG UTIL PRESS valve (2) to OPEN. 3. Set  RAMP  control  valve  handle  (3)  to  DN.  When  ramp  is  level  with cabin floor, set handle to STOP. 4. Turn EMERG UTIL PRESS valve (2) to NORMAL. 5. Apply electrical and hydraulic power. 6. Check that UTIL SYS CONT circuit breaker (4) is closed. 7. Set   RAMP   switch   (5)   to   ON.   On   aircraft   without   [65],   set  RAMP switch (5) to ON. On aircraft with [65], set RAMP PWR switch (5.1) to ON. 8. Turn pin (6) on sequence valve (7) to horizontal position. CAUTION Do not cycle cargo door with ramp in full up position. Damage to door and fuselage will occur. 9. Set  RAMP  CONTROL  valve  handle  (3)  to  DN.  When  ramp  is  fully down, set handle to UP. 10. Move RAMP CONTROL valve handle (3) to DN. When ramp is at mid position, move handle to STOP. 11. Turn pin (6) on sequence valve (7) to vertical position. 12. Pull  up  and  hold  MANUAL  OPER  knob  (8)  on  sequence  valve  (7). Gage (1) shall indicate at least 2500 psi. If it does not, use hand pump to charge accumulator. Ramp  shall  move  down  and  stop  about  10  inches  from  fully  closed position. Cargo door shall then retract into ramp. Ramp shall continue to  move  down  and  stop  when  RAMP  CONTROL  handle  (3)  is  set  to STOP. If ramp does not move, go to task 7-3.5. If cargo door does not retract, go to task 7-3.6. If UTIL SYS CONT circuit breaker (4) is open, close it. If it opens again, go to task 7-3.7. Ramp  shall  move  full  down  with  handle  (3)  at  DN.  Ramp  shall  move full up with handle at UP. If ramp does not move up, go to task 7-3.8. If ramp   moves   up   and   down   but   is   sluggish,   bleed   ramp   activating cylinders. If door moves, replace sequence valve (7). Ramp  shall  move  to  mid  position  and  remain  there  after  handle  (3)  is moved to STOP. If ramp creeps up or down, go to task 7-3.12. Cargo door shall extend. If it does not, go to task 7-3.9. 13. Release MANUAL OPER knob (8). 14. Set  RAMP  switch  (5)  to  OFF.  On  aircraft  without  [65],  set  RAMP switch  (5)  to  OFF.  On  aircraft  with  [65],  set  RAMP  PWR  switch (5.1) to OFF. 15. Set RAMP CONTROL valve handle (3) to UP. 16. Set   RAMP   CONTROL   valve   handle   (3)   to   STOP.   On   aircraft without [65] set RAMP switch (5) to ON. On aircraft with [65]  set RAMP PWR switch (5.1) to ON. 17. Set  RAMP  CONTROL  valve  handle  (3)  to  DN.  When  ramp  is  fully down set handle to UP. 18. Press  and  hold  knob  (9)  on  door  override  valve  (10).  Set  RAMP CONTROL valve handle (3) to DN. When ramp is at mid position, set handle to STOP. 19. Release knob (9). 20. Set RAMP CONTROL valve handle (3) to UP. When ramp is closed, set handle to STOP. 21. On  aircraft  equipped  with  [65]  check  operation  of  emergency extension system per task 7-3.4.1 22. Remove hydraulic power and electrical power. 23. Turn UTILITY RESERVOIR     DEPRESSURIZE     valve     (11)     to     OPEN.     Press depressurization valve (12) on apu start module (13). 24. Turn     UTILITY     RESERVOIR     DEPRESSURIZE     valve     (11)     to NORMAL. 25. Set RAMP CONTROL valve handle (3) to DN. Cargo door shall retract. If it does not, replace sequence valve (7). Ramp shall not move up. If it does, go to task 7-3.10. Ramp shall move full down with handle (3) at DN. Ramp shall move up with  handle  at  UP  and  stop  approximately  8  inches  from  full  closed position.  Cargo  door  shall  then  extend.  Ramp  shall  then  move  up  and close. If cargo door does not extend, go to task 7-3.9. If ramp does not stop before closing, go to task 7-3.11. Ramp shall move down to mid position with cargo door extended. Cargo door shall retract. If it does not, replace door override valve (10). Utility system shall depressurize. Ramp shall not move. If it does, adjust actuating cylinders. FOLLOW-ON MAINTENANCE: TM 55-1520-240-23: Battery disconnected. Electrical power off. Hydraulic power off. END OF TASK Change 14  7-124.1