Northern Airborne Technology STX100 - Manual (Page 43)

INSTALLATION APPROVAL
TEST PROCEDURE
NAT Part #: STX100-000 Description: Globalstar ™ Satphone Transceiver
Document #: STX100\000\634-0 Rev: 1.00
1.0 Introduction
The purpose of this test is to identify any interference that the STX100-000 Globalstar ™
Satphone Transceiver may cause with existing aircraft systems.
1.1
Test Conditions
The STX100-000 should be installed and function tested in accordance with the
STX100-000 Globalstar
™ Satphone Transceiver Installation and Operation manual.
1.2 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 STX100-000 and the approach aids be checked in flight.
The GPS should be operational and navigating with at least the minimum complement of
satellites. VOR/ILS/GS receivers should be set to the test frequencies and selected for
display. If possible, set up a VOR/ILS ramp test set on the test frequencies 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 STX100-000 transmitter 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 movement of flags or needles on the
VOR/LOC/GS navigation display(s).
Monitor the power plant, fuel and other electric instruments in the chart provided and
note any anomalies that occur while operating the STX100-000. Assess the results.
If the aircraft is equipped with an Automatic Flight Control or Stability Augmentation
System, test fly the aircraft and verify that the operation of the STX100-000 Satphone
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.
1.3 Results
If the installed system passes all of the applicable EMI tests, then no further action is
required. If interference is observed, then the interference must be assessed against
Rev. 1.00 May 24, 2002 Page 1 of 4
ENG-FORM: 634-0100.DOT
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