Northern Airborne Technology AA20-431 - Manual (Page 28)

AA20-431 Cabin PA System Manual SM22 Rev. 4.10
3.3.2.2 PA
Operation
To broadcast voice messages over the PA system, select the SPKR switch to the PA
position, make the appropriate selection at the aircraft audio controller, then activate the
radio PTT switch. After the chime (see section 3.4), speak clearly and deliberately into
the microphone.
3.4 Chimes
The integrated chime capabilities of the AA20-431 provide advisory tones for typical
cabin/passenger applications.
3.4.1 No Smoking
When the ‘No Smoking’ keyline is activated, the music will mute and a chime will be
heard on the speaker and in the headset(s). The chime will last for 6 to 7 seconds, then
the music audio will slowly return to its previous level (2 to 4 seconds). The chime will
activate on keying (No Smoking ‘on’) and again on un-keying (No Smoking ‘off’).
3.4.2 Seatbelt
When the ‘Seatbelt’ keyline is activated, the music will mute and a chime will be heard
on the speaker and in the headset(s). The chime will last for 6 to 7 seconds, then the
music audio will slowly return to its previous level (2 to 4 seconds). The chime will
activate on keying (Seatbelt ‘on’) and again on un-keying (Seatbelt ‘off’).
3.4.3 Message
When the ‘Message’ keyline is activated, the music will mute and a chime will be heard
on the speaker and in the headset(s). The chime will last for 6 to 7 seconds, then the
music audio will slowly return to its previous level (2 to 4 seconds). The chime will
activate on keying and again on un-keying.
3.4.4 PA
When the ‘PA’ keyline is activated, the music will mute, a chime will be heard on the
speaker and in the headset and the mic amp will be turned on. The chime will last for 6
to 7 seconds, after which mic audio will be heard on the speaker and in the headset.
When the ‘PA’ keyline is de-activated, music audio will slowly return to its previous level
(2 to 4 seconds). The chime will activate only once on keying.
End of section 3.0
Page 3-2 Apr 21, 2004
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