Northern Airborne Technology AA37 - Manual (Page 12)

AA37 Series Alerting System Manual SM39 Rev 4.00
2.3.3 Cabling and Wiring
For shielded wire applications, use Tefzel Mil-M-27500 or Mil-M-81044 shielded wire
with solder sleeves (for shield terminations) to make the most compact and easy to
terminate interconnect. Follow the wiring diagrams in Section 2.4 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. Ensure that all ground connections are clean and
well secured.
2.3.4 Post-Installation Checks
2.3.4.1 Voltage/resistance checks
Do not attach the AA37 until the following conditions are met.
Check the following:
a) P101
pin <1> for +28 Vdc relative to ground.
b) P101
pin <14> for continuity to ground (below 0.5 Ω).
2.3.4.2. Alert 1
a) Install the AA37. Power up the ship’s systems. Connect a headset to the pilot’s
headset jack and activate the AA37 Alert 1 trigger circuit. There should be a
continuous tone with no unusual noises or disruptions heard in the headset.
Reset the AA37 Alert 1 trigger circuit.
b)
Activate the second AA37 Alert 1 trigger circuit, if installed. There should be a
continuous tone with no unusual noises or disruptions heard in the headset.
Reset the AA37 Alert 1 trigger circuit.
c) Repeat
steps 2.3.4.2 a) and b) for the copilot’s headset, if the feature is used in
the installation.
Page 2-2 Nov 10, 2003
ENG-FORM: 805-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.