Northern Airborne Technology AA30-3xx - Manual (Page 12)

AA30-301 Expansion Panel Manual SM74 Rev. 4.10
2.3.2
Cautions
In all installations, use shielded cable exactly as shown and ground as indicated.
Significant ground loop and noise problems may result from not following these
guidelines.
The shielding and routing of the receive audio lines used in the AA30-301 installation is
very critical and poor performance of the aircraft audio system will result if the
installation shown on Interconnect drawing AA30\301\403-0 and -1 is not followed.
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 Post-Installation Checks
2.3.4.1 Voltage/Resistance Checks
Check the following:
a) P101 pin <13> for +28 Vdc avionics buss voltage.
b) P101 pin <12> for +28 Vdc lighting buss voltage.
c) P101 pins <15> <16> <18> <20> <22> and <25> for continuity to ground (power).
d) P101 pin <24> for continuity to ground (lighting).
2.3.4.2 Power On Checks
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.
Page 2-2 Oct 16, 2006
ENG-FORM: 805-0107.DOT
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