For those of you who can't seem to get the flight attendant announcements to play, here's some hints:

1. Be sure the AFAS's toggle switch is set to "AUTO"
2. Be sure that on the Audio Selector Panel that the "PA" and "SPKR" buttons are activated.

Then, straight from the AFAS's programmer, Hans Hartmann, here are the circumstances under which the FA announcments will play:

Yes, it can be tricky!

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Flight Attendant Cabin Announcements
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Before we start: the passenger announcements (PA) and speaker (SPKR) must be activated on the audio panel (center console).

The best way to get all flight attendant announcements is to start the plane in "OFF" mode (cold&dark).

F1 ("We're about to close the cabin door")
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Played immediately after putting the FA switch to AUTO. The aircraft must be on ground, speed must be zero and engine #1 N1 must be below 20%. Arms F2

F2 ("On behalf of our cabin and flight crew")
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Played after F1 as soon as engine #1 N1 goes above 20%

F3 ("In preparation for takeoff")
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Played 5 seconds after captains PRE TAKEOFF announcement. Arms F4

F4 ("Ladies and gentlemen, now that we're airborne")
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Played after F3 when the aircraft passes 10000ft and the seat belt signs are being switched off

F5 ("The captain has turned on the seat belt signs")
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Played at least 5 seconds after captains bad weather announcement when seat belt signs are switched on

F6 ("The captain has turned on the seat belt signs in preparation for landing")
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Played at least 5 seconds after captains descent announcement when seat belt signs are switched on. Arms F7

F7 ("For those passengers with connecting flights")
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Played after F6 when the aircraft descends below 10000ft. Arms F8

F8 ("Flight attendants: disarm doors for arrival")
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Played after F7 when flaps are retracted and airspeed is below 60 knots.

That's all folks. Have fun.