PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000
Page 3-9
Rev. 6, Dec. 2015
“(b)(5) Any other portable electronic device that the operator of the aircraft has determined will not cause
interference with the navigation or communication system of the aircraft on which it is to be used.”
You can refer to Advisory Circular 91.21-1A for more information, at
http://www.faa.gov
3.9.1
Music Muting
The SoftMute™ circuit will mute the music whenever there is conversation on the radio, the intercom, or
both, depending on the “Mute” mode selected. When that conversation stops, the music returns to the pre-
vious level comfortably, over a second or so.
The mute mode functions are controlled through Music Mute Menu which has
three
modes for each music
input. Mute ALL, Karaoke & Radio Mute.
The PMA450 always defaults to
Mute ALL
when turned on.
In Mute- music
will
mute with
either
intercom
or
radio
“Karaoke” mode - music will not mute except during radio transmissions.
Radio (Rad) Mute -
Radio
will mute music, but intercom will
not
mute music.
In addition to the panel mute menu, a remote switch may be installed to allow the passengers local access
to their Karaoke mode. When this switch is grounded, the menu choice is overridden.
3.9.2
Music Volume
The volume of the music inputs can also be adjusted from the menu of the PMA450:
Press Music → Music Volume → Desired music input. The LED Volume bar and the numeric volume will
show the volume level.
Figure 6 – Music Volume screen
3.9.3
Music in Pilot ISO mode
When the isolate (ISO) mode is activated, the music for the pilot is automatically disabled.. If desired, the
pilot can elect to hear Music #1 or #2, in the ISO mode, by toggling the Music line select with a long press
or holding the ICS button, while in the ISO mode.