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Purpose
The handle mechanism does these functions:
* Moves a closed and latched door to the cocked open position
* Moves a door in the cocked open position to the closed and
latched position.
Location
The handle mechanism is between the interior and exterior
control handles.
Physical Description
The handle mechanism has these major parts:
* Interior and exterior control handles
* Cam plate
* Door latching crank and cam roller rocker
* Door cocking crank and cam roller rocker
* Door latching crank and pushrods
* Door cocking crank and pushrod
* Door hinges and torque tube
* Upper and lower door gates, pushrods, and stoprods
* Associated shafts, bearings, retainers, springs, and
fasteners.
Functional Description
You operate the door handle mechanism manually.
The interior handle turns the cam plate.
The exterior handle fairs in a recess in the outer skin of the
door. It is spring-loaded to this position. When faired, the door
handle disengages the cam plate. When you pull the handle
from the faired position, it engages the cam plate by a spline
drive. When the handle spline drive is engaged, the handle can
turn the cam plate.
The cam plate has two cam tracks. One track drives the door
latching roller rocker. The other track drives the door cocking
roller rocker.
When the cam plate turns in the open direction, it causes these
things to occur:
* Door unlatches and its gates fold
* Door moves to the cocked open position.
The initial movement of the cam plate in the open direction
causes the latching roller rocker to rise steeply to the high cam.
This turns the roller rocker and the latching crank to which it is
splined. The latching crank transmits this motion to the door
latching mechanisms and door gates with pushrods. This
unlatches the door and folds the door gates. As the cam
continues to turn, it does not turn the latching roller rocker. This
is because the latching roller rocker stays on the high cam.
DOORS - PASSENGER/CREW - HANDLE MECHANISM
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-10-00-003
The initial turn of the cam plate in the open direction does not
turn the cocking roller rocker because it stays on the low cam.
As the cam continues to turn, it causes the cocking roller rocker
to rise to the high cam. This turns the roller rocker and the
cocking crank to which it is splined. A cocking crank pushrod
transmits this motion to the door torque tube. This causes the
door to move to the cocked open position.
When the door is in the cocked open position, the cam is at the
end of its travel. More force on the handle produces no more
motion. From this point, you push the door manually through the
door frame with the assist handles.
When the cam turns in the door closed direction, the linkages
work the same, but in reverse sequence:
* Door moves from the cocked open position to the closed
position
* Door gates unfold and the door latches engage.
The stop rods on the door gates are not part of the door gate
drive mechanism. The stop rods support the gates against their
pressure loads.
Operational Displays
A proximity sensor for the door warning system is on an upper
door latch track. When the door is not secure (not latched), the
sensor causes the P5 FWD ENTRY door warning light to come
on.
Training Information Point
The force on the control handle to open and close the door is
not large. If a large force is necessary, there is a fault with the
door or the procedure.
If the door does not close and latch easily, there may be a
clearance problem. Make sure the door-to-frame area is clear.
An incorrectly stowed escape slide girt strap may be caught
between the door and the frame.
If the airplane is pressurized, a properly rigged door will not
unlatch. This is because the door gates must open against
cabin pressure during door unlatch. Pressure on the door gates
has a mechanical advantage and prevents this.
From the cocked position, push the door through the door frame
with the assist handles. Do not use the control handle to push or
pull the door through the door frame. This puts too much stress
on the door hub.
DOORS - PASSENGER/CREW - HANDLE MECHANISM
EFFECTIVITY
GUN ALL 52-10-00
Page 10
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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737NGAMM8(66)
