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Figure  6-6-6.   External Cargo Moments Chart (Sheet 2 of 2)
Figure  6-6-8.  Ramp Controls

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-10 6-6-14            6-6-21.  Winch. Refer to Chapter 4, Section III. 6-6-22.  Cargo Door and Ramp. The cargo door and ramp has an upper section, or cargo door, and lower section, or ramp. The door retracts into the ramp when the ramp is being lowered and extends when the ramp is being raised. Retraction or extension of the door can be isolated through the ramp sequence valve so the ramp can be raised or lowered with the door retracted into the ramp or extended. The door is an inte- gral part of the ramp and only provides closure; therefore, references made to the ramp will be understood to in- clude the door and its related movements. The cargo door is jettisonable to provide an emergency exit. The cargo door and ramp is located at the aft end of the cargo compartment and is used for troop and cargo loading and unloading. In closed position, it conforms to the side con- tours  of  the  fuselage  (fig.  6-6-7).  Internal  locks  in  the ramp actuating cylinders prevent accidental opening and constitute the only locking mechanism for keeping the ramp closed. The ramp is hinged to the fuselage and opens rearward and downward to rest on the ground. When lowered to ground rest, the ramp inclines down- ward   approximately   6.75_   and   maintains   a   uniform 78-inch overhead clearance, (if HICHS is not installed), of the cargo compartment. A continuous hinge runs the entire width of the aft upper edge of the ramp and holds the three auxiliary loading ramps. The auxiliary ramps unfold  to  bridge  the  gap  between  the  ramp  and  the ground for vehicle loading and unloading. they can be adjusted   laterally   to   accommodate   various   vehicle thread widths. Hydraulic power to operate the ramp is supplied through the utility hydraulic system. 6-6-23.  RAMP CONTROL Valve. Lowering and raising the ramp is controlled by a RAMP CONTROL  valve  on  the  right  side  of  the  aft  cargo compartment between the floor and the overhead at sta 490 (fig. 6-6-8). The RAMP CONTROL valve is operated either electrically or manually. Electrical operation is per- formed by setting the RAMP PWR switch to EMERG, and using  the  RAMP  EMER  control  switch  on  the  cockpit overhead  HYD  control  panel  (Chapter  2,  Section  VI). Manual operation is accomplished by setting the RAMP PWR  switch  to  ON,  and  using  a  three-position  lever mounted on the RAMP CONTROL valve. the lever posi- tions are labeled UP, STOP, and DN (down). The control lever can be reached from the outside through a hinged panel on the aft fuselage. Figure  6-6-7.  Cargo Door and Ramp







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