PS Engineering PMA4000 Pilot’s Guide - Manual (Page 2)

2 PMA4000 TSO-Pilot Guide & User Manual
General Instructions
SCOPE
This section provides detailed operating instructions for the PS Engineering
PMA4000 Audio Selector Panel/Intercom Systems. Please read it carefully
before using the equipment so that you can take full advantage of its capa-
bilities.
This section is divided into three sections covering the basic operating ar-
eas of the PMA4000 systems. They are: Audio Selector, Transceiver Selec-
tion and Intercom.
Approval Basis
The PMA4000 Audio Selector Panels (P/N 11942) are FAA approved un-
der TSO C50c (Audio Amplifiers).
Audio Selector
Through the use of four latched, push-button,
back-lit switches, it is possible to select
any or all receiver audio.
When selected, an internal back-
light will illuminate indicating
which audio source is selected.
The Com toggle switch con-
trols what transceiver is being
heard by the pilot and copilot.
"C1" (Com 1) and "C2" (Com
2) push-buttons select the re-
ceiver, and are used to monitor
a com that is not selected for
transmit. You will always hear the
audio from the transceiver that is
se-
lected by the 2-position mic selector toggle
switch.
The users can identify which receivers are selected by noting which push-
button switches are illuminated. Push buttons labeled N1 (Nav 1), N2 (Nav
2) are "latched" type switches. When one of these buttons is pressed, it will
stay in the "in" position. Press the switch again and it be in the "out" posi-
tion and remove that receiver from the audio. While selected, an internal
lamp will also annunciate the switch.