Northern Airborne Technology AA83-100 - Manual (Page 12)

AA31 ICS Mode Controller Manual SM10 Rev. 4.10
2.3.2 Cautions
In all installations, use shielded cable exactly as shown and ground as indicated.
Significant problems may result from not following these guidelines.
2.3.3 Cabling and Wiring
All unshielded wire shall be selected in accordance with AC43.13-1B Change 1,
Paragraphs 11-76 through 11-78. Wire types should be to MIL-W-22759 as specified in
AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11. For
shielded wire applications, use Tefzel MIL-C-27500 shielded wire with solder sleeves
(for shield terminations) to make the most compact and easily terminated interconnect.
Follow the wiring diagrams in Section 2.6 as required.
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, pushbutton 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.
Page 2-2 Feb 4, 2005
ENG-FORM: 805-0107.DOT
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