Northern Airborne Technology 270 - Manual (Page 19)

SM270 Rev. 4.10 Model 270 Universal Interface Amplifier Manual
2.3.5 Post-Installation Checks
If any preset requires adjustment, be sure this is performed before flight, 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.
2.3.6
Voltage/Resistance Checks
Do not attach the model 270 until the following conditions are met.
Check the following:
a) P1
pin <1> for +28 Vdc or P1 pin <2> for +14 Vdc relative to ground.
b)
P1 pins <14> <15> <20> <21> and <23> for continuity to ground (below 0.5 Ω).
2.3.7
Power On Checks
a) Install the model 270 and power up the ship’s systems. Verify normal operation
of all radio functions. Refer to the manual supplied with the mobile radio for
specific operation details.
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.
2.4 Continued Airworthiness
Maintenance of the Model 270 is ‘on condition’ only. Periodic maintenance of this
product is not required.
2.5 Accessories Required But Not Supplied
Installation kit p/n D25SM-IKC (crimp) is required to complete the installation. The kit
consists of the following:
Quantity Description NAT Part #
1
D-min 25 Socket Housing 20-21-025
25 MS Crimp Socket 20-26-901
1 Lock Clip Set 20-27-004
1 25 Pin Metal Hood 20-28-225
Dec 12, 2006 Page 2-5
ENG-FORM: 805-0108.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.