Northern Airborne Technology NTX - Manual (Page 43)

INSTALLATION APPROVAL TEST
PROCEDURE
NAT Part #: NTX066 Description: Remote Mount FM Transceivers
Document #: NTX066\634-0 Rev: 1.00
Rev. 1.00 Aug 10, 2005 Page 1 of 5
ENG-FORM: 634-0101.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
1. Post Installation EMI Test
The purpose of this test is to identify any interference that the NTX066 may
cause with existing aircraft systems.
2. Test
Conditions
The NTX066 should be installed and all functions should be tested. The antenna
VSWR should be checked. A forward and reverse power measurement with an
in-line wattmeter installed between the transceiver and antenna should show no
more than 10% reflected power. For the following tests, ensure that the transmit
power is set to HI.
3. Methodology
Most of the EMI tests can be accomplished on the ground. In some cases, in-flight-
testing may be required/desired. If the aircraft is approved for IFR operations, it is
mandatory that interference between the NTX066 and the approach aids be checked
in-flight.
The GPS should be operational and navigating with at least the minimum compliment
of satellites. The VHF comm should be set to the frequencies indicated in the
applicable table with the squelch disabled. VOR/ILS/GS receivers should be set to the
frequencies indicated in the applicable table and selected for display. If possible, set
up a VOR/ILS ramp test set on the frequencies indicated in the applicable table and
adjust the output until the flags are out of view. The transponder and encoder should
be monitored with ramp test equipment. If possible, set the ADF to a nearby
navigation station.
Modulate the NTX066 transmitter on the frequencies indicated in the applicable
table for at least 20 seconds. Observe the GPS for any degradation in satellite
status or availability, or flags. Listen for any noise or detected audio signals on
the VHF comm(s). Listen for any noise or detected audio signals on the
VOR/LOC receiver audio and look for any movement of flags or needles on the
VOR/LOC/GS navigation display(s).
List the power plant, fuel and other electric instruments in the applicable table
and note any anomalies that occur while transmitting. Assess the results.
If the aircraft is equipped with an autopilot or a stability augmentation system,
test fly the aircraft and verify that the operation of the NTX066 transceiver does