SM55 Rev. 4.00
PTA12-000 POTS Telephone Adapter Manual
2.3.5 Post-Installation
Checks
2.3.5.1 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
).
2.3.9.2
Power On checks
Install the PTA12 and power up the ship’s systems. Verify normal operation of all
functions. Refer to Section 3 for specific operation details.
Notes
: 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.
Where the PTA12 is connected to an existing audio system, ensure that the
PTA12 is properly selected when performing audio checks.
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.
Note
: To verify proper operation, all functions and levels should be checked in-flight.
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 PTA12 is ‘on condition’ only. Periodic maintenance of this product is
not required.
Nov 12, 2003
Page 2-3
ENG-FORM: 805-0106.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
