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the amber FAULT indication light 22MQ and the LED's CHAN 1 or CHAN 2 of the control unit 24MQ show that the applicable pressure sensor is unserviceable. It is a normal system behavior that these lights may come on when the pressurization test of the fuselage is in progress. When the pressure decreases these lights go off and the CDLS is operative again.
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the amber FAULT indication light 22MQ and the LED's TOP, MID or BOT STRIKE of the control unit 24MQ show that the applicable electrical release strike is unserviceable.
**ON A/C ALL
4. Component Description
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A. Components of the Cockpit Door
(Ref. Fig. 001)
(1) Door Structure The cockpit door structure is a honeycomb core bonded between prepreg sheets. An armoured plate with the same decor as the passenger cabin lining is installed on each side of the door. The door has a cut-out section for the installation of a door escape hatch. On the cockpit door there is an upper hinge which is attached with screws to the cockpit structure. The bottom of the cockpit door has an attachment fitting which engages with the cockpit floor structure. Furthermore a door handle and a spyglass are installed on the cockpit door. Due to 'airworthiness' reasons it is not allowed to attach any additional rigid parts or similar attachments to the reinforced
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cockpit door. The rigid parts and attachments can have a negative impact if the cockpit door opens during a rapid decompression.
(2)
Door Escape Hatch The door escape hatch (referred to as hatch) is a honeycomb core bonded between prepreg sheets. Two aluminum plates with the same decor as the passenger cabin lining are installed on each side to prevent damage. Furthermore, two pip-pin fittings are installed on the inner side of the hatch. The hatch is installed into the cut-out section of the cockpit door. The two pip-pins engage with the related brackets of the door structure to keep the hatch in position.
(3)
The Three Latch Mechanism The top, center and bottom latch mechanisms are installed on the inner side of the cockpit door. The center latch mechanism has a spring-loaded D-ring assembly which when turned, extends or retrats its internal latch tenon. The adjustable tie-rods connect the three latch mechanisms together so that their internal tenons move at the same time. The extended tenons engage with the catch of the electrical release strikes so that the cockpit door is locked.
B. Components of the Cockpit Door Lock-System (Ref. Fig. 004)
(1)
Indication Light 22MQ The indication light 22MQ is installed in the COCKPIT DOOR panel 119VU of the center pedestal. The indication light 22MQ is divided into the OPEN legend and the FAULT legend. The OPEN legend comes on in amber when the cockpit door is opened. The FAULT legend also comes on in amber when there is a malfunction in the CDLS.
(2)
Key pad 25MQ The key pad 25MQ is an electronic unit, installed at the forward attendant panel 120RH. There are two LED's (red and green) and twelve pushbutton switches with the legends 0 thru 9, '*' and '#' on the front face. The logic of the key pad is divided into the "Routine Access" and the "Emergency Access". For the "Routine Access" you must enter the "#" pushbutton (or a numbered pushbutton plus the "#" pushbutton) to announce the access to the cockpit. For the "Emergency Access" you must enter the numerical emergency entry code and the "#" pushbutton. The green LED comes on when the flight crew allows entry into the cockpit. The red LED comes on when the flight crew does not allow entry into the cockpit.
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本文链接地址：A320飞机维护手册 AMM DOORS 舱门7(23)
