Northern Airborne Technology AMS43, Installation And Operation Manual

Page: 18 / 42

AMS43 Single Channel Audio Controller Manual SM59 Rev. 4.00
2.3.2 Cautions
In all installations, use shielded cable exactly as shown, and ground only as indicated.
Significant problems may result from not following these guidelines.
Failure to follow the installation and wiring instructions provided in this manual for power
and ground connections, including the rating of the circuit breaker, may lead to damage
in the power input circuitry of the unit.
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 Adjustments
The unit ships 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 on the
sides of the unit and are as follows:
2.3.4.1 Left Side panel adjustments
The trimpots on the left side panel are used to adjust the levels of audio in the user’s
headphones. Rotating the trimpots clockwise (cw) increases the level, and counterclockwise
(ccw) reduces it.
The ALERT LEVEL trimpot is used to adjust the levels for the three internally generated
Alert signals. Other parameters relating to these signals are adjusted from the right side
panel (see section 2.3.4.2.)
Page 2-2 Nov 10, 2003
ENG-FORM: 805-0106.DOT
Amendment #1 Feb 15, 2005
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.