Northern Airborne Technology MI34 - Manual (Page 12)

MI34 Mobile Interface Manual SM29 Rev. 4.00
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.
All audio installations can be degraded by incorrect wiring and shielding, and may result
in abnormal cross-talk, hum, and ground-loop noise.
2.3.3
Notes
For Midland SynTech XTR radios, the 34-pin ribbon cable assembly may need to be re-
terminated to match the pin allocations shown on drawing MI34\403-2 and drawing
MI34\403-3.
2.3.4
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 24 AWG, except power and ground lines, which should be
at least 22 AWG. Ensure that all ground connections are clean and well secured.
2.3.5 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.
WARNING:
High volume settings can cause hearing damage.
Set the headset volume control to the minimum volume
setting prior to conducting audio tests, and slowly increase
the headset volume level to a comfortable listening level.
With the MI34 disconnected from its mating connector, check pin 1 of J101 for +28 VDC
(or +14 VDC on pin 2) relative to ground and check pin 14 for continuity to ground
(below 0.5
Ω). Do not attach the MI34 until these conditions are met.
Page 2-2 Nov 30, 2003
ENG-FORM: 805-0109.DOT
Amendment # 1 Jan 10, 2007
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.