Northern Airborne Technology PIA01-001 - Manual (Page 11)

PIA01-001 Passenger Intercom Amplifier
SM78 Installation and Operation Manual
Section 2 Rev: 1.00 Issue 1 Page 2-2
ENG-FORM: 805-0121.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.4.1 Warnings
WARNING:
High volume settings can cause hearing damage.
Set the headset volume control to the minimum setting prior to
conducting tests, and slowly increase the volume to a comfortable
listening level.
2.4.2 Cautions
CAUTION:
Do not bundle any lines from this unit with transmitter coax feed lines. Do not
bundle any logic, audio, or DC power lines from this unit with 400 Hz synchro
wiring or AC power lines. Do not position this unit next to any device with a
strong alternating magnetic field such as an inverter, motor or blower, or
significant audio interference will result.
In all installations, use shielded cable exactly as shown, and ground only as
indicated. Significant problems may result from not following these guidelines.
Failure to follow the installation and wiring instructions provided in this manual
for power and ground connections, including the rating of the circuit breaker,
may lead to damage in the power input circuitry of the unit.
CAUTION:
Installation Limitations
1. Approval Settings
The PIA01 has only been tested to demonstrate compliance with the
requirements of TSO-C139 with the installation settings listed below.
Settings other than those listed are not approved.
Item Setting
Microphone Impedance 150 Ohm
Headphone Impedance 150 Ohm
These settings are applied by connector pin strapping (analog mode) or via
the digital ICS Tieline (digital mode).
2. Software Approval
A deviation to TSO-C139 has been granted by the FAA to allow the
software to be developed to RTCA/DO178B Level D in lieu of Level C. As
a result the PIA01 must not be used for flight crew intercommunication
or radio communication functions. Provision must be available in the
aircraft audio system to permit the flight crew to disconnect audio from
the PIA01 from their headphone audio.