Under emergency conditions the function of the door damper changes to an
actuator to open the door. When the release lever is raised, the
percussion mechanism breaks the diaphragm of the pressure accumulator.
This causes the nitrogen gas from the pressure accumulator to extent the
actuator piston rod.
The main components of the door damper and emergency operation cylinder
are:
-
the cylinder body,
-
the pressure accumulator,
-
the valve block,
-
the pressure gage housing,
-
the percussion housing,
The cylinder body contains the hydraulic assembly for the speed regulation and the damper assembly for smooth and safe door operation. The accumulator pressure contains the pneumatic power required for the automatic emergency operation. It is filled with nitrogen to a pressure of 123 bar (1783.9637 psi). The valve block which is installed on the cylinder body includes the charging valve and the pressure reducing valve.
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Door Damper and Emergency Operation Cylinder
Figure 008
1EFF : 301-399, 1 52-22-00Page 13 1 1 May 01/04 1 1 1CES 1 The pressure gage housing which is directly mounted on the pressure accumulator includes the pressure gage and the pressure microswitch. The pressure gage has a red, yellow and green indicator area to show the actual pressure in the gas cylinder. The pressure microswitch sends a signal to the Cabin Intercommunication Data System (Ref. 23-73-00) and the Centralized Fault Display System (Ref.31-30-00). These systems inform the flight crew that the pressure in the pressure accumulator decreases below the limit of 100 bar (1450.3770 psi).
F. Door Locking Mechanism
(Ref. Fig. 009, 010)
The door locking mechanism which is manually operated locks and keeps the
door in the safety closed position. It also lifts the door before you can
move the unlocked door to the open position.
The primary components of the door locking mechanism are:
-
the door handle mechanism,
-
the locking shaft mechanism,
-
the balance mechanism,
-
the lifting mechanism.
(1) Door Handle Mechanism The door handle mechanism includes the inboard handle assembly and the outboard handle assembly.
The inboard handle assembly contains the inboard handle, the internal control shaft, the push rod and the pull rod. The inboard handle is attached to the internal control shaft which has a twin lever and a shaft lever. A push rod is installed between the shaft lever and the engaging lever of the locking shaft assembly. The pull rod connects the twin lever and the adjustment lever unit of the lifting mechanism. The movement of the inboard handle turns the internal control shaft so that the locking shaft mechanism and the lifting mechanism are operated.
The outboard handle assembly contains the outer handle, the control mechanism and the handle flap. The movement of the handle flap operates the control mechanism. This causes the outboard handle to connect with the external control shaft. A connection rod is installed between the external control shaft and the internal control shaft. Thus, the outboard handle operates the locking shaft mechanism and the lifting mechanism during its outboard movement.
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Mechanism of the 73" Emergency Exit Door
Figure 009
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Mechanism of the 60" Emergency Exit Door
Figure 010
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On the external control shaft there are a hollow shaft with two levers. One lever is connected to the transmission shaft of the escape slide-release mechanism through the related push rod. The other lever engages with the control mechanism as soon as the handle flap is operated. This causes the transmission shaft to turn when the outboard handle is moved. It also disarms the slide-release mechanism. The control mechanism also prevents the operation of the outboard handle if the inboard handle is moved up or down. 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320飛機維護手冊 AMM DOORS 艙門3(46)
