Post-Installation Configuration & Checkout3-42 560-0982-01 Rev L GNS 480 (CNX80) Installation Manual3.3.3 System Checkout – Flight ChecksAll system functions that cannot be adequately tested on the ground will require a flight test. Even if allfunctions can be verified on the ground, a flight test is recommended as a final installation verification.Verify system operation as described in the following sections.3.3.3.1 COM Flight Test Check1. Verify the COM performance by contacting a ground station at a range of at least 50nm whilemaintaining an appropriate altitude, and over all normal flight attitudes. Performance should bechecked using low, high, and mid band frequencies.3.3.3.2 VOR Flight Test Check1. Tune a local VOR station within 50 miles.2. Verify the audio ident/voice quality.3. Verify the Morse code decoder IDs the station (95% probability).4. Fly to and from the station.5. Verify NAV flag, TO/FROM flag, and CDI are operational.6. Record accuracy in System Log (see manual).3.3.3.3 ILS Flight Test Check1. Tune an ILS at the local airport.2. Verify the audio ident/voice quality.3. Verify the Morse code decoder IDs the station (95% probability).4. Fly the approach.5. Verify NAV flag, GS flag, and CDI and VDI are operational.6. Verify BC annunciator.3.3.3.4 GPS Flight Test Check1. Verify that GPS position is not lost during normal aircraft maneuvering (e.g. bank angles of up to 30degrees and pitch angles associated with take-off, departures, approaches, landing and missedapproaches as applicable). If GPS position is lost, a “WARNING Loss of Navigation” message willbe displayed.2. Enter and activate a flight plan on the GNS 480. Fly the flight plan and verify that the display offlight plan data is consistent with the CDI indication (deviation, TO/FROM…) in the pilot’s primaryfield of view.