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rear bulkhead.
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OPERATING MANUAL
PSP 606
When aligned with the passenger/crew entrance door opening, the airstair
can be extended to the ground to form entrance/exit stairs. When not
required, the airstair can be folded and stowed by moving it forward on its
tracks to a position whereby a locating spigot on the flight compartment
bulkhead mates with a hole in the stair. Simultaneously two stair locking
plungers locate in holes in the cabin floor to secure the airstair in its
stowed condition.
With the airstair in the stowed position, the locking plungers, when
engaged, activate a microswitch and a proximity switch. These switches are
electrically interconnected with the door warning system to ensure that the
door is unobstructed and thereby ensure that door emergency operation is
unhindered.
For airstair extension the locking plungers are released and the airstair
is moved to the door opening where it locks in position. As the airstair
is extended, a locking arm automatically engages, to hold the stair in the
extended position.
C. Passenger/Crew Downward Opening Door (Figures 10 and 11).
The entrance door is manually operated and downward opening with the stairs
forming an integral part of the door structure. Its movement is controlled
by a counter-balance system of gas springs and a spring-loaded cable drum.
The latching mechanism is operated by an internal single-lever handle,
located on the forward side of the steps, a T-handle which is recessed in a
riser of a step and an external handle with a key lock. A pull-in handle
on the rear handrail can be used to reduce the force required to close the
door from the inside.
Once closed, the door is latched from the inside by pushing the internal
handle downward. The T-handle is then pulled out of its recess to stow the
external handle, which clicks audibly when stowed.
The door is unlocked from the inside when the handle is pulled upwards
ejecting the external handle from its pocket. The door is then unlatched
by continuing to pull the internal handle upwards. As the door opens, the
handrails unfold upward.
The door unlocks from the outside by the operation of a PUSH trigger in the
external handle, which is ejected from its pocket. To unlatch the door,
the external handle is then turned 45 degrees counterclockwise. Pull-out
and pull-in handles are also provided to assist the operator in opening or
closing the door from the outside or inside, respectively. When the door
is fully open a door support leg extends to the ground.
D. Emergency Exit Door
For details of the emergency exit door, refer to EMERGENCY EQUIPMENT.
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OPERATING MANUAL
PSP 606
Baggage Compartment Door (Figure 12)
The baggage compartment door is located on the left side of the aircraft
immediately aft of the passenger compartment. The door opens inwards and
upwards on two sets of tracks attached to the structure, and is assisted
during opening by balance springs with cable attachment to the door and
structure. The door is held closed by two plungers which locate inside
fittings attached to the door frame, and which are operated by an external
handle via levers and push-pull rods.
Two plunger-actuated proximity switches are installed to provide an
indication in the flight compartment, when the door is not safely closed.
On aircraft incorporating Canadair SB 600-0226 and on aircraft 1088 and
subs,
the baggage compartment door can be operated from either the inside or
outside, by a handle mechanism located near the bottom of the door.
On other aircraft,
the baggage compartment door can be opened/closed from the outside only, by
manual operation of a single handle located near the bottom of the door.
The external handle stows flush into a pocket in the door outer skin and in
this position, it acts as a lock for the latching mechanism. The handle
has a keylock which unlocks or locks a PUSH trigger. The PUSH trigger,
when pressed, ejects the handle, then it can be turned to release the
locking plungers and open the door.
Rear Equipment Bay Door (Figure 13)
The rear equipment bay door, located at the bottom of the rear fuselage,
provides access to the APU, air conditioning units, replenishment points
for No. 1 and No. 2 hydraulic systems, and the aircraft battery. The door
opens downward, and is secured at the forward edge by two hinges which are
equipped with quick-release pins to facilitate easy door removal.
The rear equipment bay door is held closed by two plungers at the rear
edge, and is opened/closed by a handle. Handle operation is the same as
　
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