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Allow 3 inches from the end of the wire to the shield termination to allow the hood to be easily installed.
Note that the hood is a 'clamshell' hood, and is installed after the wiring is complete.
All wiring should be at least 22 AWG, except power and ground lines, which should be at least 20 AWG.
Ensure that all ground connections are clean and well secured.
2.3.4
Notes
All Audio Controllers used with the AA31 must have the ICS Tie and Gain Modifications installed. This
will only be a concern on Audio Controllers prior to s/n 1918.
Power for the AA31 may be sourced from a dedicated ½ Amp protection device, or from the protection
device that provides power to the primary Audio Controller. Observe proper wire size selection in the
case of the latter.
Any Audio Controllers wired as 'Rear' Controllers have their ICS tie lines permanently connected together.
2.3.5
External Switches and Lamps
The Rear Call Switches are generally momentary, push button switches that are used to activate the ICS
Call LED's associated with the AA31. These switches can be individual items supplied by the installing
agency, or an integral part of the Audio Controllers in the aircraft.
The AA31 provides outputs to drive external lamps/annunciators to indicate the position of the ICS
Function Selector switch. These annunciators can be individual items supplied by the installing agency,
or an integral part of the Audio Controllers in the aircraft. In most cases, the various outputs are tied
together at the AA31 and used to drive a single 'isolated' annunciator.
2.3.6
Post-Installation Checks
If any preset requires adjustment, be sure this is carried out before the aircraft leaves, and that the unit
and its mating connector are secured before departure. Make all required log book entries, electrical
load, weight and balance amendments and other paperwork as required by your local regulatory agency.
2.3.6.1
Voltage/Resistance Checks
Do not attach the AA31 until the following conditions are met.
Check the following:
a)
P101 pin <1> for +28 Vdc relative to ground.
b)
P101 pin <14> for continuity to ground (less than 0.5
In an Intercom System with four Audio Controllers, check for continuity between Terminations 1, 2 and 3.
Pins <7> to <19>, Pins <8> to <20>, and Pins <9> to <21> should measure less than 1
April 14, 2012 Rev: 5.00
ENG-FORM: 805-0100.DOTX
CONFIDENTIAL AND PROPRIETARY TO ANODYNE ELECTRONICS MANUFACTURING CORP.
AA31 ICS Mode Controller
SM10 Installation and Operation Manual
).
.
Page 2-2
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