On the FWD Attendant Indication Panel (AIP) 320RH:
 -the number symbol comes on.
 2. On the handset:
 -push the PA ALL pushbutton  - the number symbol goes off.
 switch.

 -
the PA ALL message comes on. On the AFT AIPs 320RH:

 -
the PA ALL IN USE message comes on. In the handset:

 -
the tone stops.

 In the cabin, all lavatories and both AFT attendant stations:
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ACTION RESULT -------------------------------------------------------------------------------
-
push the PTT pushbutton switch.  - a LO HI LO chime is heard through the loudspeakers.

 -
push and hold the PTT and the  - a tone is heard through the
 PA ALL pushbutton switch. loudspeakers.

 NOTE : Before you start the next test step make sure that all emergency
____
 oxygen-container door-stops are in the test position.

 3.
 In the cockpit, on C/B panel 49VU:

 - open the C/Bs 2WR, 3WR, 4WR, 5WR and 6WR.

 4.
 In the cockpit, on overhead panel 21VU:

 -lift the switch guard, push and release the MASK MAN ON pushbutton switch.

5.
 In the cockpit, on maintenance panel 50VU:

 -push and release the OXYGEN TMR RESET pushbutton switch.

6.
 On the C/B panel 49VU:

 - open the C/B 2KS2.
-close the C/B 2KS2.
In the cabin:
-
the doors of the emergency oxygencontainers (circuit breaker 7WRrelated) open to the test position.

 In the cabin, all lavatories and both AFT attendant stations:

 -
the volume of the tone through the loudspeakers increases.

-
the volume of the tone through theloudspeakers decreases to the normal level.

-
the volume of the tone through the loudspeakers increases.

-
the volume of the tone through the loudspeakers decreases to the normal level.

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ACTION RESULT -------------------------------------------------------------------------------
7. On the handset:  In the cabin, all lavatories and both
 AFT attendant stations:
 - release the PTT and the PA ALL  - the tone stops.
 pushbutton switch.
 8. At the FWD attendant station:
 - put the handset back to the  All indications and annunciations are
 cradle.  cancelled.
 9. In the cockpit, on C/B panel
 49VU:
 - close the C/Bs 2WR, 3WR, 4WR,
 5WR and 6WR.
 **ON A/C 151-199,
 Subtask 23-73-00-710-177-A

 D. Do the test of the automatic high-volume announcement. NOTE : On all the emergency oxygen-containers set the door stops to the
____
 test position.

 NOTE : Do not hold the MASK MAN ON pushbutton switch for more than 30
____ sec., because the FAULT indication light in the TMR RESET pushbutton switch comes on after 30 sec.
 -------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
1. At the FWD attendant station:  At the FWD attendant station:
 - lift the handset from the  - a tone is heard in the handset.
 cradle.
 On the FWD Attendant Indication Panel
 (AIP) 320RH:
 - the number symbol comes on. 

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ACTION RESULT -------------------------------------------------------------------------------
2. On the handset:
 -push the PA pushbutton switch. - the number symbol goes off.
 -
the PA ALL message comes on. On the AFT AIPs 320RH:

 -
the PA ALL IN USE message comes on. In the handset:

 -
the tone stops.

 In the cabin, all lavatories and both AFT attendant stations:
 -push and hold the PTT and the  - a tone is heard through the
 PA pushbutton switch. loudspeakers.

 NOTE : Before you start the next test step make sure that all emergency
____
　
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