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been selected to ARM, activation of the emergency batteries will allow
emergency batteries No. 3 and 4 to automatically power the interior
emergency lighting and main entrance door emergency lighting.
B. Optional Cargo Door:
At customer option, a cargo door may be installed on the right side of the
fuselage forward of the wing leading edge. The door is eighty and one-half
(80 ½) inches high and eighty-one (81) inches wide and opens out and
upward. The door is restricted to ground operation by the nutcracker
(squat) switch system. Like the main entrance door, the cargo door is
electrically controlled and hydraulically operated, has a pneumatically
inßated seal, and is locked and latched mechanically. A depiction of the
door is shown in Figure 4.
A door control panel is located just forward of the door on the inside of the
airplane cabin. The control panel has four indicator / switchlights and an
operating switch. Hydraulic power is furnished by the auxiliary hydraulic
system that must be activated using the switch on the cockpit overhead
panel. To open the door, the auxiliary hydraulic system must Þrst be
powered. The LOCK HDL REL switchlight is then pressed, and the UNLK
legend appears in the switchlight. The UNLK legend indicates that the relay
disabling the door locking handle has released, and the handle may be
unlocked. The relay will only release the locking handle for ten (10)
seconds during which time the handle may be moved to unlock the door.
The door lock handle is mechanically connected to a vent door that opens
when the lock handle is move to the unlock position. The vent door insures
the release of cabin pressure prior to opening the cargo door. The position
of the vent door, as viewed from outside the airplane, may be used as an
indicator of the position of the door locking handle.
Once the door is unlocked, the door latching handle is moved to the open
position. Moving the handle to the open position releases six (6)
mechanical locks at the bottom of the door and opens the six
microswitches in the door warning circuit. In the open position the handle
opens relays enabling the auxiliary hydraulic system, reduced to 1400 psi
(± 100) by the main entrance door reducer valve, to power the cargo door.
The availability of hydraulic power is indicated by illumination of the DOOR
HYD PWR indicator. The door switch, located on the lower section of the
control panel, is selected to the OPEN position and the hydraulic actuator
opens the cargo door. When the door is fully open, releasing the door
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-52-00
Page 3
October 11/02
Revision 8
switch de-energizes the hydraulic power relay, and trapped hydraulic
pressure holds the door in the open position. Closing the door is the
reverse of the opening sequence.
C. Baggage Compartment Door:
The airplane baggage compartment, located in the aft part of the
pressurized section of the fuselage, is a accessible in ßight from an interior
door in the passenger compartment, and on the ground through an exterior
door Þtted into the left side of the fuselage below the left engine pylon. See
Figure 5. The exterior door opens inward and upward to provide access for
loading and unloading baggage. Mechanically linked interior and exterior
handles rotate to open the door. Like the main entrance door, the baggage
compartment door is Þtted with four bayonet-type plungers that lock the
door and position microswitches to provide the circuitry for door warning
and door seal inßation. The baggage door may be used as a
supplementary emergency exit from the airplane since the baggage
compartment is accessible from the cabin.
D. Emergency Overwing Exit Windows:
Two overwing emergency exits are installed on each side of the airplane in
the passenger seating area. The four overwing exits are the primary
escape exits since the position of the exits provides adequate ground or
water clearance for exiting the airplane in the event of a forced landing or
ditching. The overwing exits are operated by pulling outward on the marked
exit handles on the inside of the windows, unlatching the windows from the
window seals. The windows may then be removed into the interior of the
airplane, freeing the emergency access. There is an emergency exterior
handle for each overwing window exit that is accessed through a door
beneath each window. Placards on the airplane exterior provide
instructions for opening the panels and rotating the handle within to open
the corresponding emergency window.
2. Door Seal System:
A. Pressurized Doors:
　
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