PASSENGER DOOR COMPONENTS (CONT'D)
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, 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 relative to the airstairs and prevent any
upward movement in the door frame during turbulence or negative “G” flight.
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 release any residual pressure from the pressurization system.
LIFT ARM
VENT
FLAP
FORWARD
"G" LOCK
AFT "G"
LOCKING
HANDLE
GF0110_031a
LOCK
O
P
E
N
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 internal handle cover provides an indication to the cabin
crew by the red band indicators to the cover and the handle. The red band across the handle and
cover clearly shows the handle in the locked position. A safe indication is indicated by the
alignment of the two red lines.
AIRPLANE GENERAL
Rev 12, Aug 14, 2006
Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
01−10−49
