Nat AA12 Installation And Operation Manual - page 40
AA12 Compact Audio Controller Manual
SM21 Rev. 4.10
Page 3-4
Sep 9, 2004
ENG-FORM: 806-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.6
Pilot Isolate/Emergency Operation
3.6.1
Pilot Isolate
The Pilot Isolate switch is a red, two-position toggle switch. This switch can be set to
NORM for normal use. However, the AA12 provides split bus operation, allowing the
pilot to be removed from the intercom and entertainment channels. By setting the
switch to PILOT ISO, the pilot is connected directly to the radios, leaving the copilot and
passengers to continue to use the intercom and hear entertainment, but not be
interrupted by the pilot or any incoming radio traffic. The green annunciator does not
illuminate for the pilot transmit operations in the PILOT ISO mode.
Note: In this mode, the copilot's MIC is not locked out and transmission is possible,
although incoming radio audio is not received.
Pilot Isolate Switch
3.6.2
Emergency operation
If the AA12 loses power for any reason, it changes to the Power Fail mode and the pilot
is connected directly to the radios for EMERGENCY operation. The external TX PTT
switch still functions in this mode. This mode is similar to the PILOT ISO mode except
that all copilot and passenger functions are lost since they depend on external power.
The front panel annunciator failing to light under any condition indicates a power failure.
End of section 3
CAUTION:
The pilot should confirm that all aspects of
EMERGENCY operation are working before
accepting the aircraft into service.