On the overhead panel 21VU:

 -
the SYS ON indicator light goes off.

In the cabin:

-
the emergency announcements stop.

 **ON A/C 052-055, 057-057,
 Subtask 35-23-00-720-054-B
 C. Functional test of automatic mask release NOTE : The prerecorded announcements are normally established by the
____ operator in accordance with the PRAM-Vendor. You can hear the emergency announcement only if it is recorded.
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1.
 On the circuit breaker panel 49VU:

 - open circuit breaker 2WR and 3WR:

 2.
 On the overhead panel 21VU:

-lift the switch guard and push and hold the MASK MAN ON pushbutton switch for more than 30 sec.
 -release the MASK MAN ON
pushbutton switch.

3.
 On the maintenance panel 50VU:

On the overhead panel 21VU:
-the SYS ON indicator light comes on.
 In the cabin:
 -all doors of the emergency oxygen containers open.
 -the emergency announcements are heard.
 On the maintenance panel 50VU:
 -after approx. 30 sec. the FAULT indicator light in the TMR RESET pushbutton switch comes on.
-the FAULT indicator light in the TMRRESET pushbutton switch goes off.

 -------------------------------------------------------------------------------
ACTION RESULT -------------------------------------------------------------------------------

-push the TMR RESET pushbutton switch.
4. On the FWD Attendant Panel (FAP) 120RH:
 -push the PRE REC ANN. STOP membrane switch.
 5. In the cabin at the first two seatrows:
 -close the doors of all related emergency oxygen containers.
 6. On the overhead panel 21VU:
-push the AHS ON pushbutton switch.
7. At the vacuum source:
-
slowly decrease the pressure to 16800 ft. (5120 m)

-
slowly increase the pressure to 0 ft. (0 m).

-
the On indicator light in the TMRRESET pushbutton switch comes on during the time the pushbutton is pushed.

 On the overhead panel 21VU:

 -
the SYS ON indicator light goes off.In the cabin:

-
the emergency announcements stop.

On the overhead panel 21VU:
-
the ON legend in the AHS ONpushbutton switch comes on.

In the cabin at the first two seatrows:

-
the doors of the respective oxygencontainers open at 16000 +0 -500 ft. (4870 +0 -150m).

 On the overhead panel 21VU:

 -
the SYS ON indicator light comes on. In the cabin:

 -
the emergency announcements are heard.

 -------------------------------------------------------------------------------
ACTION RESULT -------------------------------------------------------------------------------
8. On the maintenance panel 50VU: On the maintenance panel 50VU:

 -push the TMR RESET pushbutton switch.
9. On the FWD Attendant Panel (FAP) 120RH:
 -push the PRE REC ANN. STOP membrane switch.
 10. On the overhead panel 21VU:
-push to reset the AHS ON pushbutton switch.
11. At the electronic rack 103VU:
 -remove the SWITCH OFF relay 9WR.
 -install a wire between pin A2 and A3 of the relay socket.
 12. In the cabin at the first seatrow:
 -close the door of one emergency oxygen container.
 13. At the vacuum source:
-slowly decrease and hold the pressure to 14800 ft. (4500 m) for more than 30 sec.
-
the On indicator light in the TMRRESET pushbutton switch comes on during the time the pushbutton is pushed.

 On the overhead panel 21VU:

 -
the SYS ON indicator light goes off.In the cabin:

-
the emergency announcements stop.

On the overhead panel 21VU:

-
the ON legend in the AHS ONpushbutton switch goes off.

In the cabin at the first seatrow:
-the door of the related oxygencontainer opens at 14000 +0 -500 ft.(4260 +0 -150m).
 On the overhead panel 21VU:

 -------------------------------------------------------------------------------
ACTION RESULT -------------------------------------------------------------------------------
14. In the cabin at the first
seatrow:

R - after approx. 30 sec. close R the door of the related emergency oxygen container.
 15. At the vacuum source:
 -slowly increase the pressure to 0 ft. (0 m).
 16. On the maintenance panel 50VU:
-push the TMR RESET pushbutton switch.
　
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