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Sept 04
1-15
P I LOT T R A I N I N G GU I D E
AIRPLANE GENERAL
PASSENGER DOOR SCHEMATIC
PASSENGER DOOR COMPONENTS
The following components are described to provide an understanding of the passenger
door operating system.
LIFT ARMS
Two levers are connected from either end of the lockshaft to the fixed linked arms on
the airstair structure. They are driven by the handles and assisted by the tension spring.
Their purpose is to lift the door out of its frame, and hold it up and out in relation to the
airstair while the door is opening.
“G” LOCKS
In the locked position, the “G” lock hooks hold the door in relation to the airstairs and
prevent any upward movement in the door frame during turbulence, or negative “G”
flight.
CLOSED POSITION
Handrail
Cable
Assembly
GX_01_030
1-16 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
AIRPLANE GENERAL
VENT FLAP
A pressurization vent flap is centrally located at the top of the door under the
lockshaft. The flap prevents pressure building up until the “G” locks engage. Once the
locks are in and the flap is shut, the pressure holds the flap firmly shut. The vent flap is
opened by the lockshaft mechanism as the “G” locks are disengaged to prevent any
residual pressure from the pressurization system.
LOCKED INDICATION
Visual indication of latching and locking is given by an indicator arm that is driven
directly by the last motion of the internal handle. The indicator, in the form of a green
line, lines up with a green line on the airstairs only after the door latches and detents
are engaged. The indication is viewed through a window cutout in the internal handle
cover. A safe indication is indicated by the alignment of the two green lines. A
window in the handle exposes a red fixed plate when the handle is out of the safe
locked position.
PASSENGER DOOR OPERATING HANDLES
The external handle is set into a box in the lower door structure. It is connected by
push/pull rods inside the door to the lockshaft, at the forward end.
Lift Arm
Aft “G” Lock
Vent Flap
Forward “G” Lock
Locking Handle
GX_01_031
For Training Purposes Only
Sept 04
1-17
P I LOT T R A I N I N G GU I D E
AIRPLANE GENERAL
EXTERNAL HANDLE
As the lockshaft reaches its fully locked position, the handles are held in position with
spring tension. When the handles are moved out of the locked position, the spring
assists in lifting the door and reduces the load on the handles.
The internal handle is a lever on the forward side of the door directly attached to a
lockshaft and to the forward door lift arm.
GX_01_032
Lockshaft
Note: The door is not in the fully
closed position until the handle
moves to the full down position.
1-18 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
AIRPLANE GENERAL
INTERNAL HANDLE
NOTE: Handle shown in the locked
(stowed) position. The door is not in
the fully closed position until the
handle moves fully down.
GX_01_033
For Training Purposes Only
Sept 04
1-19
P I LOT T R A I N I N G GU I D E
AIRPLANE GENERAL
PASSENGER DOOR SWITCHES
The internal door operating switch is controlled on and off by the “DOOR” switch
installed internally in the door frame, next to the main passenger door.
The external door operating switch is controlled on and off by the “DOOR” switch
installed next to the main the main passenger door.
GX_01_034
INTERNAL SWITCH
(View looking from inside
the airplane)
EXTERNAL SWITCH
Note:
Both switches are guarded
but not shown.
(Green aircraft switches shown)
1-20 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
AIRPLANE GENERAL
EXTERNAL DOOR SWITCH ACCESS PANEL
PASSENGER DOOR OPERATION
The following examples are intended to familiarize the operator with events which
occur when moving the passenger door from either the open, or closed positions. The
door operations are described in detail and should be followed as per Aircraft
Maintenance Manual, Chapter 52.
EXTERNAL DOOR OPERATION
To open the passenger door externally:
• Push flap in
• Grasp handle
• Lift fully to open
• Pull outwards
To close the passenger door externally:
NOTE
Do not recycle the handle during closing operation without
reopening door sufficiently to rearm door uplock lever.
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