PS Engineering PMA450 Pilot's manual and operation manual - page 8
Page 8
202-450-0000
PMA450 Pilot Guide Rev. 1
in volume controls; therefore, volume also can be adjusted additionally at
the individual headset.
Mono headsets in Stereo Installation
Not recommended, because the benefit of IntelliAudio is lost. However, if
desired, the PMA450 can be installed monaurally by using the LEFT audio
connections only (left side contains Fail-Safe audio). Do NOT short left and
right together.
NOTE: Mono headsets that short the tip and ring (i.e. older
models) will introduce some audio distortion when used.
Modern, stereo headsets are recommended in all positions.
Intercom Modes (8)
The “ICS” pushbutton switch on the panel provides the selection of the
three intercom modes. The description of the intercom mode function is
valid only when the unit is not in the "Split" mode. In the split mode, the
pilot and copilot intercom is controlled by the ICS button
selecting CRW.
This button cycles through the intercom modes, from left
to right, then right to left as: ISO, ALL, CRW and CRW,
ALL, ISO. A green indicator shows which mode is cur-
rently active.
ISO (Pilot Isolate): The pilot is isolated from the intercom
and is connected only to the aircraft radio system. He
will hear the aircraft radio reception (and sidetone during radio trans-
missions). Copilot will hear passengers’ intercom and Music, while
passengers will hear copilot intercom and Music. Neither will hear air-
craft radio receptions or pilot transmissions. The pilot can hear music if
desired.
ALL: All parties will hear the aircraft radio and intercom. Crew and passen-
gers will hear selected Music. During any radio or intercom communi-
cations, the music volume automatically decreases. The music volume
increases gradually back to the original level after communications
have been completed. The music muting can be activated by radio only,
radio and intercom, or nothing, for a Karaoke mode.
CRW (C
REW
): Pilot and copilot are connected on one intercom channel
and have exclusive access to the aircraft radios. They may also listen to
Music. Passengers can continue to communicate with themselves with-
out interrupting the crew and may listen to music as configured.
Alternate Intercom Mode
The PMA450 includes an Alternate Intercom Mode. This mode allows in-
tercom communications between crew and passengers, without interrupting