Northern Airborne Technology VR28-013 - Manual (Page 13)

VR28-013 DC/DC Power Converter Manual SM32A Rev 4.00
2.3.3
Cabling and Wiring
All wiring should be at least 22 AWG, except power and ground lines, which should be
at least 18 AWG. Ensure that all ground connections are clean and well secured.
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
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.
2.3.4.1
Voltage/resistance checks
Do not attach the VR28-013 until the following conditions are met.
Check the following:
a) Check harness pins <1>, <2> and <9> for +28 Vdc relative to ground.
b) Ensure +13 Vdc lines pins <6>, <7> and <14> are not shorted to ground.
c) Check P101, pins <4> <11> and <12> for continuity to ground (less than 0.5 Ω).
2.3.4.2
Power On checks
Power up the aircraft's system with the VR28-013 installed, and confirm that the unit is
operating properly and the Power Output LED is on.
Double-check that the mounting and connector hardware is tightened securely.
Upon satisfactory completion of all performance checks, make the required log
entries and complete the necessary Regulatory Agency paperwork before
releasing the aircraft for service.
Page 2-2 Aug 21, 2006
ENG-FORM: 805-0109.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.