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R  When the push coil is energized, the plunger extends and puts a load 
R  on the high-energy spring. If the plunger is fully extended, the push 
R  coil is de-energized and the hold coil is energized to hold the 
R  plunger in this position. 
R  When the hold coil is also de-energized, the high-energy spring 
R  retracts and the plunger moves quickly to the retracted position. 
R  All electrical release strikes have an internal sensor, which 
R  operates the solenoid when it receives an applicable signal. Then, 
R  the plunger extends and the catch is blocked or it retracts and the 
R  catch is free. 
R  The PPTC assembly is a thermal fuse that prevents an overheat 
R  condition of the solenoid. This malfunction can occur during a 
R  blockage of the catch because the push coil stays energized. 
R 
R  The center electrical release strike (31MQ) also has an external 
R  microswitch to monitor the condition of the center latch mechanism. 
R  When its tenon disengages from the catch, this causes the OPEN legend 
R  of the indication light 22MQ to come on. 
R  (6) Control Unit 24MQ 
R  The control unit 24MQ is installed in the overhead panel 20VU. This 
R  panel has the white legends CKPT DOOR CONT, the STRIKE TOP, MID and 
R  BOT and the CHAN 1 and CHAN 2. 
R  The control unit controls the logic (fault indications, time delays 
R  and door access control) of the cockpit door lock-system. It has two 
R  internal pressure sensors which start the fault logic sequence if a 
R  rapid decompression in the cockpit occurs. This can also occur during 
R  the pressurization test of the fuselage. 
R  The microprocessor of the control unit receives signals from: 
R  - the toggle switch 26MQ 
R  - the key pad 25MQ. 
R  The microprocessor sends a signal to operate: 
R  - the buzzer 23MQ 
R  - the indication light 22MQ 
R  - the green or red LED of the key pad 25MQ 
R  - the solenoids of the three electrical release strikes 30MQ, 31MQ 
R  and 32MQ.

 

 5. Operation
_________
 A. Normal Mode
 NOTE : If the CDLS is not energized with electrical power the cockpit
____ door is in the unlocked condition. When you then push the cockpit door in the flight direction it opens.
 (1) Routine Access into the Cockpit Door from the Cabin Side Push the "#" pushbutton or enter a numbered pushbutton plus the "#" pushbutton on the key pad 25MQ . Then the buzzer 23MQ sounds which tells the flight crew that an access into the cockpit is requested. When the flight crew sets the toggle switch 26MQ on the COCKPIT DOOR panel 119VU to the UNLOCK position this causes:
 -
the control unit 24MQ to de-energize the solenoids of the electrical release strikes 30MQ, 31MQ and 32MQ. Then the plungers retract so that they do not block their catches.

 -
the control unit 24MQ to send a signal to the key pad 25MQ so that

 its green LED comes on. The green LED on the key pad 25MQ shows that the cockpit door is unlocked and access into the cockpit is available.
 Push the cockpit door into the flight direction until the magnetic stop keeps it in its fully open position. Then the amber OPEN indication light 22MQ on the COCKPIT DOOR panel 119VU comes on. This shows that the cockpit door is open.
 When the flight crew sets the toggle switch 26MQ on the COCKPIT DOOR panel 119VU to the LOCK position this causes:
 -
the control unit 24MQ to energize the solenoids of the electrical release strikes 30MQ, 31MQ and 32MQ. Then their plungers remain extended and block their catches.

 -
the control unit 24MQ to send a signal to the key pad 25MQ and its

 red LED comes on. The red LED on the key pad 25MQ shows that the cockpit door is locked and an access into the cockpit is rejected.
 In this case the operation of the key pad 25MQ and the buzzer 23MQ is prevented during a defined time (adjustable between 5min. and 15 min.). The flight crew can cancel this function when they set the toggle switch 26MQ to the UNLOCK position.
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 (2) Opening of the Cockpit Door from the Cockpit Side Lift and turn the D-ring of the center latch mechanism through 90 degrees so that its internal, spring-loaded tenon retracts. At the same time, the related tie-rods operate the spring-loaded tenons of the top and bottom latch mechanisms. The tenons retract and disengage from the catches of the electrical release strikes and you can open the cockpit door.
　
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