Northern Airborne Technology PTA12-0xx - Manual (Page 10)

PTA12-000 POTS Telephone Adapter
SM55-1 Installation and Operation Manual
Section 2 Rev: 1.01
Issue 4 Page 2-3
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.4 Post-Installation Checks
2.4.4.1 Voltage/Resistance Checks
Do not attach the PTA12-000 until the following conditions are met.
Check the following:
a) Check P101, pins <1> and <3> for +28 Vdc relative to ground.
b) Check P101, pins <14> and <16> for continuity to ground (less than 0.5
Ω).
2.4.4.2 Power On Checks
Notes: 1. PTA12 functionality is highly dependant on the airborne telephone system interface. Ensure
proper operation of the telephone transceiver, and ensure that the transceiver has an activated
telephone line.
2. Where the PTA12 is connected to an existing audio system, ensure that the PTA12 is properly
selected when performing audio checks.
Power up the aircraft’s systems and confirm normal operation of all functions of the PTA12-000. Refer to
Section 3 (Operation) for specific operational details.
a) Initiate a call to a valid telephone number and verify the operation for HOOK, HOLD, DTMF
keys (0-9, ¿, #), and VOL. Re-initiate the call using REDIAL. Test the FLASH function
(where applicable) while in the off-hook state (active).
b) Place the PTA12 in the on hook (inactive) state, and have another party call the line
connected to the PTA12. Verify proper RINGER, HOOK and HOLD operation.
c) To verify proper operation, all functions and levels should be checked in-flight.
Upon satisfactory completion of all performance checks, make all required log book entries, electrical
load, weight and balance amendments and other documentation as required by your local regulatory
agency before releasing the aircraft for service.