Northern Airborne Technology AA12S-600 - Manual (Page 13)

AA12S-600 Compact Stereo Audio Controller
SM84 Installation and Operation Manual
Section 2 Rev: 1.02 Issue 1 Page 2-3
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.4 Post-Installation Checks
2.4.4.1 Voltage/Resistance Checks
Do not attach the AA12S-600 until the following conditions are met.
Check the following:
a) Check P101 pin <1> for avionics buss voltage.
b) For 28 V lighting input, check P101 pin <8> for avionics lighting buss voltage relative to
ground (with lighting on).
c) For 14 V lighting input, check P101 pin <23> for avionics lighting buss voltage relative to
ground (with lighting on).
d) Check P101 pins <16>, <37> and <38> for continuity to ground (less than 0.5
Ω).
e) Check P101 pins <9>, <10>, <11>, <12>, <13>, <14>, <15> and <24> for continuity to
ground when the relevant switch is closed.
f) Check P102 pins <16> and <31> for continuity to ground when the relevant switch is closed.
2.4.4.2 Power On Checks
Power up the aircraft’s systems and confirm normal operation of all functions of the AA12S-600. Refer to
Section 3 (Operation) for specific operational details.
a) Begin with only the CREW 1 headset installed. Confirm correct radio operation, both receive
and transmit. Check radio audio inputs and selection of same.
b) If there is a music source in the system turn it on and verify that music is removed in the
CREW and ISO modes. Check for proper mute operation.
c) 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.
d) Check the ICS modes (NORM, CREW, and ISO) and Emergency operation. Confirm that the
ICS is disabled in the CREW 1 headset in ISO mode.
e) Plug in the CREW 2 headset. Check for correct ICS and transmit operation. Check that
CREW 2 loses transmit capability in ISO mode.
f) Plug in the PAX 1 headset. Check for correct ICS and transmit operation. Check that PAX 1
loses transmit capability in CREW and ISO modes.
g) Plug in any remaining headsets, and check for correct ICS operation.
h) To verify proper operation, all functions and levels shall be checked in-flight.
i) 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.