Version 16.10 AF-6600 AF-5000 Series Install Manual 110
Transponder Post Installation Checks
Post installation checks should be carried out in accordance with your certification requirements. These checks should
include:
• Mode S interrogations to verify correct address programming.
• Verification of the reported altitude using a static tester.
• Where installed, verification of correct squat switch ground/airborne indications. In an aircraft with a squat
switch, setting the Mode switch to ALT when the aircraft is on the ground should leave the transponder in
GND mode; when the aircraft becomes airborne, the mode should switch automatically to ALT.
• Interrogations to verify the receiver sensitivity. A Mode S transponder should have a minimum triggering
level (MTL) of between -77 dBm and -71 dBm. Failure to meet this requirement usually indicates antenna or
coaxial cable problems.
• Interrogations to verify the transmitted power. A Class 1 installation should have no less than 125 Watts at
the antenna (and no more than 500 Watts). A Class 2 installation should have no less than 71 Watts at the
antenna (and no more than 500 Watts). Failure to meet this requirement is also generally due to antenna or
wiring issues.
• Where installed, verification of the GPS position source and ADS-B outputs. Whenever a valid position is
received by the transponder and the transponder is in any mode other than Standby, ADS-B Extended
Squitters should be observed on the transponder test set.
• Ensure all regulatory requirements are met. In the United States, the transponder must be tested and
inspected per FAR 91.413.
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