TM 55-1510-219-10 CAUTION Insure  the  cabin  door  is  closed  and locked.      Operating   the   cargo   door while   the   cabin   door   is   open   may damage  the  door  hinge  and  adjacent structure. (1) Opening cargo door. CAUTION Avoid  side  loading  of  the  gas  springs to prevent damage to the mechanism. 1. Handle access door (lower forward corner of door) -Unfasten and open. 2. Handle   Lift   hook   and   move   to   OPEN position. 3. Handle access door Secure. 4. Handle  access  door  (upper  aft  corner  of door) -Unfasten and open. 5. Handle   Press   button   and   lift   to   OPEN position then latch in place. 6. Handle access door Secure. 7. Door support rod Attach one end to cargo door ball stud (on forward side of door). 8. Support rod detent pin Check in place. 9. Cabin door sill step Push out on and allow cargo  door  to  swing  open.    Gas  springs will automatically open the door. 10. Door  support  rod  Attach  free  end  to  ball stud on forward fuselage door frame. (2) Closing cargo door. CAUTION Avoid  side  loading  of  the  gas  springs to prevent damage to the mechanism. 1. Door   support   rod   Detach   from   fuselage door   frame   ball   stud,   then   firmly   grasp free end of rod while exerting downward force to overcome the pressure of   gas   spring   assemblies,   Then   remove   support   rod from  door  as  gas  spring  assemblies  pass  over-center position. 2. Cargo  door  Pull  closed,  using  finger  hold cavity in fixed cabin door step. 3. Handle  access  door  (upper  aft  corner  of door) -Unfasten and open. 4. Handle Pull handle down until it latches in closed position. 5. Handle access door Secure. 6. Handle access door (lower forward corner of door) -Unfasten and open. 7. Handle Move to full forward position. 8. Safety  hook  Check  locked  in  position  by pulling aft on handle. 9. Handle access door Secure. c. Cabin Emergency Hatch.  The cabin emergency hatch,   placarded   EXIT-PULL,   is   located   on   the   right cabin  sidewall  just  aft  of  the  copilot's  seat.    The  hatch may   be   released,   from   the   inside   with   a   pull-down handle.    A  flush  mounted  pull  out  handle  allows  the hatch to be released from the outside.  The hatch is of the   non-hinged,   plug   type   which   removes   completely from  the  frame  when  the  latches  are  released.    The hatch  can  be  key  locked,  from  the  inside,  to  prevent opening from the outside.  The inside handle will unlatch the  hatch  whether  or  not  it  is  locked,  by  overriding  the locking  mechanism.    The  keylock  should  be  unlocked prior  to  flight  to  allow  removal  of  the  hatch  from  the outside in the event of an emergency.  The key remains in   the   lock   when   the   hatch   is   locked   and   can   be removed only when the hatch is unlocked.  The key slot is  in  the  vertical  position  when  the  hatch  is  unlocked. Removal  of  the  key  from  the  lock  before  flight  assures the pilot that the hatch can be removed from the outside if necessary. 2-10.  CABIN DOOR CAUTION LIGHT. As  a  safety  precaution,  two  illuminated  MASTER CAUTION   lights   on   the   glare   shield   and   a   steadily illuminated  CABIN  DOOR  yellow  caution  light  on  the annunciator panel indicates the cabin door is not closed and locked.  This circuit is protected by 5-ampere circuit breakers placarded ANN PWR and ANN IND, located on the overhead circuit breaker panel (fig.  2-26). 2-17