Northern Airborne Technology AA86 - Manual (Page 25)

SM48 Rev. 4.00 AA86/87 Stereo Intercom Manual
Nov 12, 2003 Page 3-5
ENG-FORM: 806-0104.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
3.2.5.3 Stuck Mic Detector
The AA86/87 Stuck Mic Detector is automatic and therefore includes no front panel
switches or controls. An audible 'beeping' will be heard in both pilot and co-pilot
headsets if either pilot or co-pilot Push-To-Talk has been depressed for more than 30
seconds. If it is desired to continue transmitting when this audible warning is heard,
momentarily release the PTT button to reset the ‘Stuck Mic’ Detector timer.
3.3 EMERGENCY OPERATION
The NAT AA86/87 intercom incorporates a fully automatic Fail-Safe circuit that
automatically, and without pilot intervention, switches the pilot’s headset (including
microphone) directly to the aircraft radios in the event of loss of intercom power and
most other critical intercom failure conditions.
IT IS POSSIBLE THAT CERTAIN RARE FAILURE MODES WILL NOT TRIGGER
AUTOMATIC FAIL-SAFE OPERATION. Upon detection of an intercom/communication
failure, simply TURN THE INTERCOM OFF to restore full Fail-Safe operation and to
ensure direct connection of the pilot’s headset to the avionics equipment.
End of section 3.0