Northern Airborne Technology AA83-001 rev.4.00 - Manual (Page 18)

AA83-001 InterMUSIC™ Stereo Intercom System Manual SM09-2A Rev. 4.00
Note: Unusual buzzes, hums or other background audio may be symptomatic of
multiple grounds or noisy external systems sharing the same wire bundle.
Incorrect jack wiring is a common fault, especially for passenger stations, and
may cause loss of audio, a tone on the headset lines, or other problems.
c) Plug in the copilot's headset. Check for correct radio and ICS operation. Check
pilot's transmit priority. Check yoke or cyclic switch functions, if applicable.
d)
Plug in the hand mic (if applicable to the installation), and test for correct
operation in all modes. It must activate the transmitter(s) in all cases.
e)
Plug in any remaining headsets, and check for correct ICS operation.
f)
To verify proper operation, all functions and levels should be checked in-flight.
g)
To verify 'fail-safe' operation, ensure that the front-panel switch is in the NORM
position, and then pull the breaker or fuse that powers the AA83-001. The pilot's
headset is now connected directly to the COM or audio panel, and should be
checked to ensure the RX and TX functions work properly. It may be necessary
to adjust the RX VOL side trimpot to ensure RX audio from the audio panel is at
a suitable level for audibility.
Be sure headsets are of good quality and are installed correctly. Unless the AA83 has
specifically been wired for mono operation NEVER USE MONO AIRCRAFT
HEADSETS in the system, as they will short out one side of the AA83 power amplifier
when installed in stereo jacks. This may result in eventual unit failure, which IS NOT
COVERED BY WARRANTY.
Upon satisfactory completion of all performance checks, make the required log
entries and complete the necessary Regulatory Agency paperwork before
releasing the aircraft for service.
2.4 Continued Airworthiness
Maintenance of the AA83-001 is ‘on condition’ only. Periodic maintenance of this
product is not required.
Page 2-6 Feb 8, 2006
ENG-FORM: 805-0108.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.