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V.   CARGO RAMP AND DOOR CHECK.
24.  Pull and hold knob

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 4-47 13.  RAMP CONTROL VALVE handle — UP. Check that ramp moves to the full up position and cargo door remains retracted. 14.  RAMP  CONTROL  VALVE  handle  —  DN  and hold until ramp is at mid-position, then STOP. Check   that   ramp   stops   at   mid-position   with cargo door fully retracted. CAUTION Do not manually operate cargo door with ramp in full up position. Damage to door and fuse- lage will occur. 15.  RAMP CONTROL SEQUENCE VALVE — Turn pin to vertical position. 16.  RAMP CONTROL SEQUENCE VALVE MANUAL  OPER  knob  —  Pull  up  and  hold. Check that cargo door extends fully. 17.  RAMP CONTROL SEQUENCE VALVE MANUAL OPER knob — Release. Check that cargo door retracts fully into ramp. 18.  RAMP PWR switch on overhead panel — OFF. 19.  RAMP CONTROL VALVE handle — UP. Check that ramp does not move. 20.  RAMP CONTROL VALVE handle — STOP. 21.  RAMP PWR switch on overhead panel — ON. 22.  RAMP CONTROL VALVE handle — DN. Check that   ramp   moves   to   the   full   down   position (resting on the ground), and cargo door remains retracted. 23.  RAMP CONTROL VALVE handle — UP. Check for the following sequence of actions: a.   Ramp moves upwards and stops approximately 8 inches from the fully closed position.







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