Northern Airborne Technology 802 - Manual (Page 12)

802-009 Switch Panel
SM802 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 4 Page 2-5
ENG-FORM: 805-0117.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.6 Post-Installation Checks
2.4.6.1 Voltage/Resistance Checks
Do not attach the 802-009 until the following conditions are met.
Check the following:
a) Check P1, pin 55 for +28 Vdc relative to ground.
b) Check P1 pin 54 for continuity to power ground (less than 0.5
Ω).
c) Check P1 pin 52 and P1 pin 53 for 115 Vac 400 Hz.
d) Check P1 pin 51 for continuity to chassis ground (less than 0.5
Ω).
e) Check P1 pin 18 for continuity to ground when the PTT key switch is activated (less than
0.5
Ω).
f) Check all shielded cable grounds for continuity to ground (less than 0.5
Ω).
g) Check all speaker and mic inputs and outputs for correct HI/LO orientation.
2.4.6.2 Power On Checks
Power up the aircraft’s systems and confirm normal operation of all functions of the 802-009. Refer to
Section 3 (Operation) for specific operational details.
a) Begin with only the Pilot's headset installed, no hand mic. Confirm correct radio operation,
both receive and transmit and Interphone operation. Check yoke (or cyclic) switch action.
b) Plug in the Copilot's headset. Check for correct radio and Interphone operation. Check pilot's
transmit priority. Check yoke (or cyclic) switch functions.
c) Check Interphone operation between Pilot and Copilot positions.
d) Plug in the hand mic, if installed, and test for correct operation in all modes.
e) Plug in any remaining headsets, and check for correct Interphone 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 shall be checked in-flight.
g) Check preset adjustments are completed before aircraft departure.
Upon satisfactory completion of all performance checks, make all required log book entries, electrical
load, weight and balance amendments and other documentation as required by your local regulatory
agency before releasing the aircraft for service.
2.5 Adjustments and Connections
2.5.1 Adjustments
There are three screwdriver potentiometer adjustments on the 802-009 accessible through access holes
in the rear of the unit. These are for OXY MODE INPH VOL, BRIEFER VOL, and SDTN VOL.
The OXY MODE INPH VOL is used to adjust the preset interphone volume when the NORM MIC/OXY
MIC selector switch is in the OXY MIC position and the oxygen mask microphone is in use.