AA12S Series Compact Audio Controller
SM69 Installation and Operation Manual
Section 2 Rev: 1.00
Issue 4
Page 2-3
ENG-FORM: 805-0117.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
Unless otherwise noted, all wiring shall be a minimum of 24 AWG, except power and ground lines, which
shall be a minimum of 22 AWG. Reference the Interconnect drawing for additional specifications. Check
that the ground connection is clean and well secured, and that it shares no path with any electrically noisy
aircraft accessories such as blowers, turn and bank instruments or similar loads. Power to this unit must
be supplied from a separate circuit breaker or fuse (fast blow), and not attached to any other circuit
breaker without additional protection. Verify that the selected circuit breaker size and wire gauge are
adequate for the installation using the techniques specified in AC43.13-1B Change 1, Paragraphs 11-47
through 11-51 and 11-66 through 11-69.
2.4.4
Post-Installation Checks
2.4.4.1
Voltage/Resistance Checks
Do not attach the AA12S until the following conditions are met.
Check the following:
a) Check P101, pin <1> for avionics buss voltage.
b) Check P101, pin <16> for continuity to ground (less than 0.5
Ω
).
c) Check P101, pins <9>, <10>, <11> and <12> for continuity to ground when the relevant
switch is closed.
d) Check P301, pin <5> for avionics lighting buss voltage relative to ground (with lighting on).
e) Check P301 pin <17> for continuity to ground.
2.4.4.2
Power On Checks
Power up the aircraft’s systems and confirm normal operation of all functions of the AA12S. Refer to
Section 3 (Operation) for specific operational details.
a) Install the AA12S and power up the aircraft’s systems. Turn on the radios and accessories
required for the system.
b) Check for correct radio audio and adjust for an acceptable level.
c) Perform all installed functions, and check the ICS and TX functions for all users. Refer to
Section 3 (Operation) for specific operational details.
Note:
Significantly different headsets may have different microphone characteristics.
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
The unit is shipped from the factory with all internal adjustments set to the normal test levels. Once
installed in the aircraft, it may be desirable to change some of these settings to best suit the local
operating environment. The internal adjustments are located along the sides of the unit.
