TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TFM-550 Installation & Operating Instructions
TiL 99RE262 Rev A Issue 9
A-1
APPENDIX – TO “INSTALLATION INSTRUCTIONS”
POST INSTALLATION EMI TEST
PURPOSE
The purpose of this test is to identify any interference that the TFM-550 may cause with
existing aircraft systems. As the TFM-550 installation may include the ATC-550 antenna
tuner controller, this test, as required, will also identify any interference caused by the ATC-
550.
TEST CONDITIONS
The TFM-550 transceiver and any accessories (e.g., RC-550, ATC-550) should be installed
and function tested. The antenna VSWR should be checked. A forward/reverse power check
with a in-line wattmeter should show no more than 10% reflected power. For the following
tests, insure that the power switch is in the high position.
METHODOLOGY
Most of the EMI tests can be accomplished on the ground. In some cases flight testing is
required or is easier. If the aircraft is approved for IFR operations, then it is mandatory that
interference between the TFM-550 Airborne FM 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 with the squelch open.
VOR/DME receivers should be set to the frequencies indicated and selected for display. If
possible, set up a DME ramp test set on the frequencies indicated and adjust the output
until the flags are out of view. The transponder and encoder should be monitored with ramp
test equipment. Set the output of the transponder test set to 3db above the output
necessary to achieve 90% reply. If possible set the ADF to a nearby navigation station.
Modulate the TFM-550 transmitter on the indicated frequencies 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; look for any moment of flags or needles on the
VOR/LOC/GS navigation display(s). Observe the transponder for any loss of reply or
spurious reply.
List the power plant, fuel and other electric instruments in the chart provided and note any
anomalies that occur while transmitting. Assess the results.
If the aircraft is equipped with an autopilot or a stability augmentation system, then test fly
the aircraft and verify that operation of the TFM-550 transceiver does not have adverse
effects on these systems. After checking for gross effects at a safe altitude, fly an
approach with each of the different navigation systems coupled to the autopilot (ILS, GPS
etc.) and look for any anomalies.
When the installation includes the ATC-550 antenna tuner controller, this test (where
indicated by an asterisk “*”) will also identify any interference caused by the ATC-550. In
these cases, the ATC-550 must be turned on and off by means of its breaker as often as
required, while monitoring the victim equipment.
Содержание TFM-550
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