PS Engineering PMA9000EX Installation Manual - Manual (Page 25)

PS Engineering
PMA9000EX Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-920-0000 Page 3-4 Rev. 9, Jan. 2011
3.8.1 Speaker Amplifier
The speaker (SPR) can be turned on or off in the same manner as the selected secondary navaids. This
control will place all selected audio on the cockpit speaker when this switch is selected. Except for the
unswitched audio, the speaker amplifier is not active in the "Split Mode”.
Unswitched audio, (the inputs dedicated to autopilot disconnect, altimeter warning, etc.) will come
through the speaker regardless of the speaker button position.
Depending on installation, important audio annunciations such as radar altimeter or autopilot disconnect
will come over the speaker even if it is not selected, while other unswitched, but muted inputs, such as
GPS alerts, will only be present if the SPR button is selected. Consult your professional avionics installer
for these important configuration details.
3.8.2 Alternate Intercom Function Mode
Alternate Intercom Function is a mode that allows everybody to talk on the intercom, but the passengers
do NOT here the aircraft radios. In addition, when the aircraft radios are active, the crew does not hear
the passengers’ microphones, although passengers continue to hear each other.