DA80 Series DigiVOX™ Digital Intercom Manual
SM57 Rev. 4.10
2.3.8
Post-Installation Checks
2.3.8.1 Voltage/resistance
checks
Do not attach the DA80 until the following conditions are met.
Check the following:
a)
Check P101, pin
<1>
for +12 to 30 Vdc relative to ground.
b)
Check P101, pin
<14>
for continuity to ground (less than 0.5
Ω
).
c)
For the DA80-010 only, check P101, pin
<25>
for continuity to ground (less than
0.5
Ω
) when the ICS KEY is activated.
2.3.8.2
Power On checks
Install the DA80 and power up the aircraft’s systems. Verify normal operation of all
functions. Refer to Section 3 for specific operation details.
a)
Begin with only the pilot's headset installed, no hand mic. Check for correct radio
operation (both receive and transmit) and ICS operation. 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 PLT ISO. 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 radio and ICS operation. Check
pilot's transmit priority. Check yoke or cyclic switch functions, if applicable.
d)
Plug in the hand mic, 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.
Note
: Incorrect jack wiring is a common fault for rear passenger stations, and
may cause a wide range of problems.
f)
To verify proper operation, all functions and levels should be checked in-flight.
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.
Page 2-6
Oct 13, 2004
ENG-FORM: 805-0104.DOT
PROPRIETARY AND CONFIDENTIAL TO NORTHERN AIRBORNE TECHNOLOGY LTD.
