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The main entrance door, baggage compartment door and optional cargo
door are surrounded by pneumatic seals that inßate to maintain cabin
pressurization in ßight. The seals are manufactured from natural or
synthetic rubber compounds reinforced with knitted elastic fabric and
covered with neoprene. The door seals are connected to a dedicated
pneumatic supply line plumbed into the bleed air manifold. A pressure
regulator in the supply line maintains inßation at seventeen (17) to nineteen
(19) psi and incorporates a safety relief valve to prevent over-inßation and
blowouts of the seals. Check valves installed in the line maintain seal
inßation in the event of loss of bleed air pressure, ensuring the integrity of
cabin pressurization.
Door seals are activated when the doors are in the correct locked and
latched position, signalled by the position of the bayonet Þttings on the
main entrance and baggage doors or locking and latching handles on the
optional cargo door. The seals inßate as engine bleed air enters the
manifold for cabin pressurization, pushing out against the frame of each
door.
On airplanes SN 1000-1284 having ASC 364, and SN 1285 and
OPERATING MANUAL
2A-52-00 PRODUCTION AIRCRAFT SYSTEMS
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October 11/02
Revision 8
subsequent, additional pneumatic supply lines, one from each engine, are
installed to the door seal pressure regulator. The additional lines ensure a
constant pressure and ßow output from the door seal regulator.
B. Smoke Evacuation Valve:
On airplanes SN 1000-1155 having ASC 157, SN 1034 and 1156 and
subsequent, a smoke evacuation valve is installed in the pneumatic line to
the baggage door inßatable seal. See the illustration in Figure 6. The
evacuation valve is located within a panel on top of the frame of the door
opening from the passenger cabin into the baggage compartment. The
valve has two positions: NORMAL OPS that selects normal operation of
the baggage door seal, and EVAC SMOKE that closes the pneumatic line
to the baggage door seal, deßating the seal and allowing any smoke
accumulating in the aft section of the pressurized cabin to be drawn out of
the airplane around the deßated baggage compartment door seal.
3. Unpressurized Section Doors:
A. Tail Compartment Door:
Access to the unpressurized compartment in the aft fuselage is provided by
a door and a telescoping ladder attached to the inside of the door. See
Figure 7. The tail compartment door is opened and closed from outside the
airplane with a handle installed ßush with the airplane surface, accessed by
a push-to-release button on the handle. When the handle is released, it
extends and can be rotated to retract the bayonet Þttings that lock the door.
The door opens downward and the attached ladder is manually extended
to provide access to the compartment. A microswitch on the bayonet Þtting
recess is connected to the door warning system. The microswitch will also
extinguish any tail compartment lights left on when the door is latched.
If for some reason the telescoping ladder has moved from the stowed
position while the door is closed and interferes with opening the door, a
small access panel on the aft part of the door may be removed and the
ladder repositioned to operate the door.
B. Service Compartment Doors:
The doors of the airplane service panels have a striker plate that closes a
microswitch within the panel. When the door to the panel is opened, the
microswitch is opened, powering a light within the panel and sending an
open signal to the door warning system.
The following service panels are located on the exterior of the airplane. Not
all airplanes have the provision for panel internal lighting or for door
position monitoring with the door warning system.
• Lavatory service
• Water service
• Oxygen service
• Single-point refueling
• Forward external switch panel
A forward lavatory service panel is installed as standard equipment on SN
1439 and subsequent. SN 1439 through 1454 have provisions to enable
door position monitoring, if desired by the operator. On SN 1455 and
subsequent, door position monitoring is enabled as standard.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-52-00
Page 5
October 11/02
Revision 8
Entrances, Exits and External Doors (Airplanes Not Having Cargo Door)
Figure 1
OPERATING MANUAL
2A-52-00 PRODUCTION AIRCRAFT SYSTEMS
Page 6
October 11/02
Revision 8
Entrances, Exits and External Doors (Airplanes Having Cargo Door)
Figure 2
　
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