Val Avionics Ltd
AP 100 Audio Panel
Installation and Operator’s Manual
crew. Muting for the external marker beacon receiver audio is provided by the MKR
switch. A steady LED annunciator for the MKR switch indicates that marker beacon
received audio, if present, will be heard in the headphones and over the cabin speaker if
the SPKR switch is selected. The pilot may mute the marker audio by depressing the
MKR select switch. Doing so will mute the incoming marker audio for approximately 20
seconds. While the marker audio is muted the MKR LED annunciator will flash.
Four un-switched audio inputs are provided at the rear connector for such audio inputs as
DME, ADF, Auto Pilot alerts or any other audio source which would commonly be
routed to the aircraft headphone and cabin speaker systems. These audios are not
controlled by any of the selector switches on the AP 100, therefore audio levels for these
devices will be controlled on each respective unit.
Figure 2 Unit Controls
P/N 0720100
Page 9
Original Issue
December 06
