AA95-1000TSO Single Channel Audio Controller
Installation and Operation Manual
Rev 1.01
CONFIDENTIAL AND PROPRIETARY TO COBHAM
Page 3-2
When the Patient Phones ON/OFF switch is placed in the OFF position, the PAT Phones output is
disconnected. This is normally used when a PAX station is connected to a user whom the installer
wishes to have controlled access to the interphone system, such as an airlifted patient on board an air
medical aircraft who should not hear all interphone communications. However, the PAT phones output
can be used for any PAX user if the PAT switch is left on.
When the CALL/ISO input to the AA95-1000TSO is grounded, the CALL/ISO indicator LED will light. When the
CALL button is pressed, the call chime will activate and a CALL switch connection from the AA95-1000TSO to
another AA95-1000TSO CALL/ISO input will cause the CALL/ISO indicator LED to illuminate.
The NAV receive audio select switches (blue switch bats) are three position switches. When set to the up or
down position, the respective NAV receive audio is selected on. When set to the center off position, the
respective NAV receive audio is selected off.
The master receive volume control (RX VOL) adjusts all receive audio concurrently from 1% to full. It is
important to set the individual radio volume controls to a nominal level, then use the master receive volume on
the audio controller to adjust for changing flight conditions.
When the red mode switch is set to NORMAL, the passengers will hear the radio audio as selected on the
controller. The passengers will not hear any radio audio when the red mode switch is in the ISO/EMR position.
3.3.2
Transmit Selector Switch
The transmit selector switch is a six position switch used to select the desired transceiver. When the
hand mic or transmit PTT switch is activated, the mic will be coupled to the radio selected. The pilot has
priority over the copilot during transmit operations.
Receive audio for the transceiver selected is automatically activated as a function of the rotary selector
switch, and no additional switching is needed to establish outside communication. During transmit, all
audio selected is muted except the sidetone of the transceiver in use.
The front panel TX indicator will illuminate green when either the pilot or co-pilot transmits.