Northern Airborne Technology AA86 - Manual (Page 13)

AA86/87 Stereo Intercom Manual SM48 Rev. 4.00
Page 2-8 Nov 12, 2003
ENG-FORM: 805-0104.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4 Post-Installation Checks
2.4.1 Voltage/resistance checks
Do not attach the AA86/87 until the following conditions are met.
Check the following:
a)
Check P1, pin <1> for +10 to +32 Vdc relative to ground.
b)
Check P1, pins <14> and <15> for continuity to ground (less than 0.5 Ω).
2.4.2
Power On checks
Install the AA86/87 and power up the ship’s comm/nav systems. Verify normal
operation of all functions. Refer to Section 3 for specific operation details.
a)
Begin with only the pilot's headset installed. Check for correct radio operation
both receive and transmit. Check yoke (or cyclic) switch action.
b)
If there is a music source in the system turn it on and verify that music is heard in
all modes except Pilot Isolate. Check for proper mute operation.
Note: Unusual buzzes, hums or other background audio are symptomatic of
multiple grounds, or noisy external systems such as blowers or pumps
sharing wiring with the audio system. Failure to key or correctly modulate
a transmitter is often the result of forgetting to connect all required
grounds to the radio or external audio system.
c)
Plug in the copilot's headset. Check for correct ICS operation. Check yoke
switch functions, if installed.
d)
Plug in any remaining headsets, and check for correct ICS operation.
Note: Incorrect jack wiring is a common fault for rear passenger stations, and
may cause a wide range of problems.
e)
To verify proper operation, all functions and levels should be checked in-flight.
2.5 Continued Airworthiness
Maintenance of the AA86/87 Stereo Intercom is ‘on condition’ only. Periodic
maintenance of this product is not required.