Speaker amplifier (7), Public address function – PS Engineering PMA450 Installation Manual User Manual
Page 24
PS Engineering
PMA450 Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-450-0000
Page 3-4
Rev. 3, November 2014
NOTE: Switched Inputs can be renamed at the configuration set up. See §
for more information.
In SPLIT mode, only the pilot will hear selected navigation audio.
3.6
Speaker Amplifier (7)
To activate the PMA450 cockpit speaker output, press and hold the bottom line-select button (SPR) for one
second or until SPR appears in the display.
In “Split Mode” all audio that the pilot hear will also be present in the speaker.
Unswitched audio #1 & #2, (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.
Unswitched
Input
Hear in
Fail Safe
(Pilot)
Hear in
Crew Headset
Hear in SPR
1
Yes
Yes
Yes
2
No
Yes
Yes
3
No
Yes
When SPR selected
4
No
Yes
When SPR selected
3.6.1
Public Address Function
To access PA function, press and hold the center line select button for more than 1 second, until the display
changes to PUBLIC ADDRESS.