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cabin door. If the upper cabin door is not closed with the locking pins
engaged, the vent door will remain open to prevent the airplane from
pressurizing. The vent door is connected to the upper door handle
mechanism through a series of bell cranks and link rods which will
keep the vent door closed while the upper door handle is in the closed
position. As the upper door handle is rotated out of the closed position,
the vent door will open and remain open while the handle is in
transition. When the handle is in the fully open position, the vent door
will close. The vent door will remain closed while the upper cabin door
is open to prevent ice and moisture contamination.
The lower cabin door is equipped with a single locking handle which is
installed in the upper edge of the door as it is viewed in the closed position.
The handle can be lifted out of the recess and rotated forward to
latch the door or aft to unlatch the lower cabin door. Gas struts are installed
on the forward lower door structure to aid in closing and
prevent damage if the door is inadvertently allowed to drop open.
Pilot’s Manual
1-6 PM-132A
CABIN ENTRY DOOR (CONT)
A cable and knob assembly is attached to the forward side of the lower
door frame. The cable and knob assembly is used to raise and lower the
lower door from inside the cabin. When closing the lower cabin door, a
secondary latch will automatically engage and hold the lower door in
position against the door seal until the lower door handle is rotated
forward to the locked position. If the handle is not rotated to latch the
door and the door is left in position by the secondary latch, the upper
door will be prevented from closing due to a pin which extends outboard
from the lower door just below the handle.
When the locking handle on the lower door is rotated forward, the
latching mechanism drives four pins into the fuselage frame, securing
the lower door. The inside and outside handles on the upper cabin door
are secured to a common shaft within the door. When either upper door
handle is rotated to the closed position, six latching pins are driven into
the fuselage structure and two pins are driven from the upper door into
overlapping halves in the lower door. There are a total of eight pins
installed in the upper door. Two of the six upper door latching pins are
driven through both the fuselage structure and through interlocking
arms on the lower door, which secure the doors together.
When the cabin entry door pins are engaged (there are twelve pins
total, eight in the upper door, four in the lower door), the door becomes
a rigid structural member. Correct pin engagement may be checked
using the small sight windows installed in the upper and lower inner
door panels. Sight windows are provided to check pin engagement for
ten of the latch pin locations, for two middle lock pins and for the lower
lock (pawl).
ENTRY DOOR ANNUNCIATIONS
All of the twelve cabin door latching pins are installed so they contact
a microswitch when the pin is fully engaged. If any of these pins do not
make contact when the upper door handle is closed, a red ENTRY
DOOR warning light is displayed on the Crew Warning Panel (CWP)
and a red ENTRY DOOR message on the Engine Indicating and Crew
Alerting System (EICAS) illuminates to provide the crew with visual
indication of cabin door security.
Pilot’s Manual
PM-132A 1-7
ENTRY DOOR ANNUNCIATIONS (Cont)
A white ENTRY DOOR PIN message will illuminate on the CAS
whenever the aircraft is on the ground and the cabin door pins are not
all fully engaged or all not fully disengaged. The ENTRY DOOR CWP
message will be simultaneously displayed with the ENTRY DOOR PIN
CAS message. If the keylock on the upper cabin entry (forward
emergency exit) door is locked and electrical power is applied to the
aircraft the red ENTRY DOOR light on the CWP will illuminate steady
to prevent operations with the emergency exit locked. The red ENTRY
DOOR and white ENTRY DOOR PIN CAS messages will also be
displayed on the EICAS when the aircraft is in this configuration.
If the DOOR circuit breaker on the pilot’s circuit breaker panel is out,
the red ENTRY DOOR CWP annunciator and the red ENTRY DOOR
and white ENTRY DOOR PIN CAS messages will all be displayed at
the same time.
Pilot’s Manual
1-8 PM-132A
CABIN DOOR OPERATION
To open the cabin door from the outside:
1. Insert the key in the key lock and rotate to unlock.
2. Lift the upper door handle out and rotate the handle clockwise
with both hands to the stop, releasing the door latch pins.
3. Raise the upper door by hand until the gas struts automatically
　
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