Nat InterMUSIC AA83-001, Инструкция по установке и эксплуатации

Страница: 12 / 30

AA83-001 InterMUSIC™ Stereo Intercom System Manual SM09-2A Rev. 4.00
2.3.2 Cautions
Do not bundle any lines from this unit with transmitter coax lines. Do not bundle any
logic, audio, or DC power lines from this unit with 400 Hz synchro wiring or AC power
lines. Do not position this unit next to any device with a strong alternating magnetic field
such as an inverter, motor or blower, or significant audio interference will result.
In all installations, use shielded cable exactly as shown and ground as indicated .
Significant problems may result from not following these guidelines.
All audio installations can be seriously degraded by incorrect wiring and shielding, and
may result in abnormal cross-talk, hum and ground-loop noise. Be especially careful
with all microphone wiring and Tie Line wiring, as these lines carry the lowest level
signals in the aircraft.
All microphone and headset jacks should be electrically isolated from the airframe or
significant ground loop noise may result.
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. Aircraft harnessing should permit the unit to be lowered from the
panel for easy access to all side adjustments. Do NOT mount the unit until all
adjustments have been carried out.
All wiring should be at least 22 AWG. Ensure that all ground connections are clean and
well secured, and that they share 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 breaker (1 A) or fuse (1 A fast), and not attached to any other
existing breaker without additional protection. The correct fuse is included with the
AA83.
Ensure that all ground connections are clean and well secured.
Page 2-2 Feb 8, 2006
ENG-FORM: 805-0108.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.