9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
Flying Never Sounded So Good!™
PMA4000
PMA4000
Pilot’s Guide/Operation Manual
Audio Selector Panel
with 4-place
IntelliVOX® Intercom System
FAA--
FAA
Patented under one or more of the following; No. 5,903,277;
6,160,496 and 6,493,450
202--
041--
041
0000
0000
202
TSO C50c
TSO C50c
Rev 1
Rev 1
May 2004
May 2004
1 PMA4000 TSO Pilot Guide & User Manual
General Instructions
SCOPE
This section provides detailed operating instructions for the PS Engin eering
PMA4000 Audio Selector Panel/Intercom Systems. Please read it carefully
before using the equipment so that you can take full advantage of its capabilities.
This section is divided into three sections covering the basic operating areas of the PMA4000 systems. They are: Audio Selector, Transceiver Selection and Intercom.
Approval Basis
The PMA4000 Audio Selector Panels (P/N 11942) are FAA approv ed under 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 backlight will illuminate indicating
which audio source is selected.
The Com toggle switch controls what transceiver is being
heard by the pilot and copilot.
"C1" (Com 1) and "C2" (Com
2) push-buttons select the receiver, and are used to monitor
a com that is not selected for
transmit. You will always
audio from the transceiver that is selected by the 2-position mic selector toggle
switch.
The users can identify which receivers are selected by noting which pushbutton 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" position and remove that receiver from the audio. While selected, an internal
lamp will also annunciate the switch.
hear the
2 PMA4000 TSO-Pilot Guide & User Manual
Intercom Mode Selector Switch
Unit power is turned on and off by the mode selector switch. In the
OFF or "FAIL-SAFE" position,
the pilot is connected directly to Com 1 allowing
transmit and receive capability regardless of unit
condition. Any time power is removed or turned
OFF, the audio selector will be placed in the fail-
safe mode. The switch is a 3-position mode
switch that allows the pilot to tailor the intercom
function to best meet the situation.
I
SO: (Up Position): The pilot is isolated from the intercom and is connected
only to the aircraft radio. He will hear the aircraft radio reception (and sidetone during radio transmissions if provided by the transceiver). Copilot and
passengers will hear the intercom and music on Entertainment input, but
not the aircraft radio receptions or pilot transmissions.
A
LL: (Middle Position): All parties will hear the aircraft radio, intercom,
and music from entertainment input. However, during any intercom communications, the music volume automatically decreases when SoftMute is
active . The music volume increases gradually back to the original level
after communications have been completed.
Speaker Amplifier
Pressing the volume control will activate the cockpit speaker. This switch
will place all selected audio on the cockpit speaker when selected. The
speaker is automatically muted when the radio push to talk (PTT) is active.
To reduce power consumption and internal heat buildup, switch off the
speaker amplifier when not in use.
Microphone (Transmit) Selector Switch
Microphone Selector
The up switch position is C
copilot will be connected to the Com l transceiver.
While in the C
OM 1 or COM 2 mode, the intercom
functions normally. Both the pilot and copilot have
transmit capabilities on the selected transceiver. All
hear the selected audio if the intercom is in the A
mode. Only the person who presses their Push To
Talk (PTT), will be heard over the aircraft radio.
Placing the toggle switch in the C
place pilot and copilot on Com 2.
The PMA4000-Series has an automatic selector mode. Audio from the se-
OM 1. Both pilot and
LL
OM 2 position will
3 PMA4000 TSO Pilot Guide & User Manual
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