DOC AIRBUS | AMM A320FFWD PASSENGER/CREW DOOR - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The doors are in the forward section of the fuselage, between the stations FR16 and FR20.
The doors have two different mechanisms :
The emergency escape slide is operated by the emergency control-handle on the inner side of the door.
If you open the door from the outside, the escape slide is automatically disarmed.
The dimensions of the door are :
The doors have two different mechanisms:
The slide/raft is operated by the emergency control handle on the inner side of the door.
If you open the door from the outside, the slide/raft is automatically disarmed.
The dimensions of the door are:
** ON A/C NOT FOR ALL The doors are in the forward section of the fuselage, between the stations FR16 and FR20.
The doors have two different mechanisms :
- the locking and compensation mechanism
- the emergency evacuation mechanism
The emergency escape slide is operated by the emergency control-handle on the inner side of the door.
If you open the door from the outside, the escape slide is automatically disarmed.
The dimensions of the door are :
- Height: 1829 mm (72.0079 in.)
- Width: 813 mm (32.0079 in.)
The weight of the door is: - without the escape slide 90 kg (198.4160 lb)
- with the escape slide 114 kg (251.3269 lb)
The doors have two different mechanisms:
- the locking and compensation mechanism
- the emergency evacuation mechanism
The slide/raft is operated by the emergency control handle on the inner side of the door.
If you open the door from the outside, the slide/raft is automatically disarmed.
The dimensions of the door are:
- Height : 1829 mm (72.0079 in.)
- Width : 813 mm (32.0079 in.)
The weight of the door is: - with the slide/raft 147 kg (324.0794 lb)
- without the slide/raft 90 kg (198.4160 lb)
A. Structure of the Door
The primary structural elements of the door are:
These elements are attached to the door:
The primary structural elements of the door are:
- the horizontal longerons
- the vertical curved members
- the outer skin
- the inner skin
- the edge members
These elements are attached to the door:
- the adjustable stops which give the safety if the pressurization system is defective. They can be adjusted to put the door flush with the fuselage.
- the guide rollers engage in the sliders on the frame of the door. They are positioned so that the stops disengage or move in the correct position when you lift or lower the door.
- you can see the warning light panel through the door window when you open the door from the outside.
- a seal is installed around the door on the inner side. It has holes at equal intervals.
When the door is closed, the seal is pushed against the frame of the fuselage. When the passenger cabin is pressurized, the seal inflates.
The lower guide fittings on the door frame have holes to drain the rainwater.
The four air stoppers are installed between the door and the door frame. They prevent the cold air from penetrating into the cabin.
An additional thermal insulation blanket is installed behind the emergency escape slide, around the door/support arm connections and behind the door buffer housing.
3. Operation
A. Locking and Compensation Mechanism
Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL
Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL
Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL
The door is locked with a hook on the upper section of the door.
This hook is attached to the locking shaft with a rod and a bellcrank.
An arm on the locking shaft gives a visual indication.
A spring rod holds the door in the locked position.
A safety pin stops the door if there is a malfunction of the locking mechanism or the lifting mechanism.
The inner and outer control handles are slaved to one another by a gearbox assembly.
The gearbox assembly is attached to the locking shaft and the reducer shaft. It stops the outer handle when the door is released with the inner handle.
When the door closes, the inner control handle puts the outer control handle in its housing through the gearbox.
When the door is open, and in the up position, a safety pin prevents the gearbox from turning.
The door is immobilized in the up position when the lowering shaft no longer touches the stop fitting on the frame.
The compensation mechanism is a torsion bar. It enables easy opening and closing of the door by weight compensation when it is released.
The force that is necessary to release the door must be equal to or less than 16 daN (35.9694 lbf)
Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL This hook is attached to the locking shaft with a rod and a bellcrank.
An arm on the locking shaft gives a visual indication.
A spring rod holds the door in the locked position.
A safety pin stops the door if there is a malfunction of the locking mechanism or the lifting mechanism.
The inner and outer control handles are slaved to one another by a gearbox assembly.
The gearbox assembly is attached to the locking shaft and the reducer shaft. It stops the outer handle when the door is released with the inner handle.
When the door closes, the inner control handle puts the outer control handle in its housing through the gearbox.
When the door is open, and in the up position, a safety pin prevents the gearbox from turning.
The door is immobilized in the up position when the lowering shaft no longer touches the stop fitting on the frame.
The compensation mechanism is a torsion bar. It enables easy opening and closing of the door by weight compensation when it is released.
The force that is necessary to release the door must be equal to or less than 16 daN (35.9694 lbf)
B. Escape slide control mechanism
The escape slide is installed on the bottom of the door.
When the emergency control handle is in the armed position, the escape slide girt bar engages into the fittings on the door threshold. It is stowed on the door when the emergency control handle is in the DISARMED position
A housing installation that contains a cam-disk and a roller attaches the escape slide control lever to the outer control handle. It disarms the escape slide automatically when the door is opened with the exterior control handle.
The escape slide control mechanism puts the escape slide control lever in the DISARMED position when the door is not fully closed and locked.
A hook prevents arming of escape slide when the door is open.
A spring rod and a hook are attached to the locking shaft with a rod.
The locking shaft locks the escape emergency handle in the DISARMED position.
The escape slide inflation mechanism is a striker attached to the bellcrank assembly on the escape slide control mechanism. When the emergency control handle is put in the ARMED position, the striker turns about its axis and moves under the striker mechanism attached to the damper and emergency operation cylinder. The emergency control handle is in the ARMED position.
A visual indicator is installed at the forward end of the girt bar.
There is a special "wiper" ring on slide flexible controls. The special ring reduce the control loads of flexible controls under adverse freezing conditions.
A slide/raft is installed on the bottom of the door. The slide/raft girt bar has a built-in quick release mechanism.
When the emergency control handle is in the armed position, the escape slide girt bar engages into the fittings on the door threshold. It is stowed on the door when the emergency control handle is in the DISARMED position
A housing installation that contains a cam-disk and a roller attaches the escape slide control lever to the outer control handle. It disarms the escape slide automatically when the door is opened with the outer control handle.
The escape slide control mechanism puts the escape slide control lever in the DISARMED position when the door is not fully closed and locked.
A hook pin prevents arming of the escape slide when the door is open.
A spring rod and a hook are attached to the locking shaft with a rod.
The locking shaft locks the slide/raft control handle in the DISARMED position.
The slide/raft inflation mechanism is a striker attached to the bellcrank assembly on the slide/raft control mechanism, the striker turns about its axis and moves under the striker mechanism attached to the damper actuator and the emergency operation cylinder. The emergency control handle is in the ARMED position.
A visual indicator is installed at the forward end of the girt bar.
There is a special sealing ring on the slide/raft flexible controls. The special ring reduces the control loads of flexible controls under adverse freezing conditions.
The escape slide is installed on the bottom of the door.
When the emergency control handle is in the armed position, the escape slide girt bar engages into the fittings on the door threshold. It is stowed on the door when the emergency control handle is in the DISARMED position
A housing installation that contains a cam-disk and a roller attaches the escape slide control lever to the outer control handle. It disarms the escape slide automatically when the door is opened with the exterior control handle.
The escape slide control mechanism puts the escape slide control lever in the DISARMED position when the door is not fully closed and locked.
A hook prevents arming of escape slide when the door is open.
A spring rod and a hook are attached to the locking shaft with a rod.
The locking shaft locks the escape emergency handle in the DISARMED position.
The escape slide inflation mechanism is a striker attached to the bellcrank assembly on the escape slide control mechanism. When the emergency control handle is put in the ARMED position, the striker turns about its axis and moves under the striker mechanism attached to the damper and emergency operation cylinder. The emergency control handle is in the ARMED position.
A visual indicator is installed at the forward end of the girt bar.
There is a special "wiper" ring on slide flexible controls. The special ring reduce the control loads of flexible controls under adverse freezing conditions.
A slide/raft is installed on the bottom of the door. The slide/raft girt bar has a built-in quick release mechanism.
When the emergency control handle is in the armed position, the escape slide girt bar engages into the fittings on the door threshold. It is stowed on the door when the emergency control handle is in the DISARMED position
A housing installation that contains a cam-disk and a roller attaches the escape slide control lever to the outer control handle. It disarms the escape slide automatically when the door is opened with the outer control handle.
The escape slide control mechanism puts the escape slide control lever in the DISARMED position when the door is not fully closed and locked.
A hook pin prevents arming of the escape slide when the door is open.
A spring rod and a hook are attached to the locking shaft with a rod.
The locking shaft locks the slide/raft control handle in the DISARMED position.
The slide/raft inflation mechanism is a striker attached to the bellcrank assembly on the slide/raft control mechanism, the striker turns about its axis and moves under the striker mechanism attached to the damper actuator and the emergency operation cylinder. The emergency control handle is in the ARMED position.
A visual indicator is installed at the forward end of the girt bar.
There is a special sealing ring on the slide/raft flexible controls. The special ring reduces the control loads of flexible controls under adverse freezing conditions.
C. Support Arm of the Door
Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL
Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL
Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL
The support arm is attached to the door with the upper connection link and the lower connection link (lifting lever) that is attached to the reducer shaft with an adjustable rod.
The support arm and the two upper and lower guide arms move the door forward and out of the aircraft.
Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL Locking and Compensation Mechanisms ** ON A/C NOT FOR ALL The support arm and the two upper and lower guide arms move the door forward and out of the aircraft.
D. Indicating and Warnings
Indicating and Warning of the Forward Passenger/Crew Door ** ON A/C NOT FOR ALL
Indicating and Warning of the Forward Passenger/Crew Door ** ON A/C NOT FOR ALL
Indicating and Warning of the Forward Passenger/Crew Door ** ON A/C NOT FOR ALL Indicating and Warning of the Forward Passenger/Crew Door ** ON A/C NOT FOR ALL (1) Mechanical indicating :
(a) A visual indicator on the shaft of the locking mechanism indicates the position of the door (open or closed).
(b) A visual indicator on the girt bar indicates the position of the girt bar (engaged or not).
(2) Electrical indicating :
(a) The proximity switches transmit the position of:
- the escape-slide control lever on the escape-slide control mechanism.
- the door handle on the shaft of the locking mechanism.
- the hook on the upper frame of the door.
(3) SLIDE ARMED indicator light and CABIN PRESSURE warning light panel:
(a) The SLIDE ARMED indicator light comes on if a person tries to open the door when the escape-slide is in the ARMED position.
(b) When the cabin pressure is greater than 2.5 mb with engines stopped and slide disarmed the CABIN PRESSURE warning light comes on and flashes. This prevents sudden opening when a person tries to open the door.