Garmin GTR 225 Installation Manual

Also see for GNC 255: Pilot's guide

Contents

Garmin GTR 225 Installation Manual Manual pdf 73 page image

190-01182-02 GTR 225/GNC 255 TSO Installation ManualRev. B Page 6-196.7 Flight Checks6.7.1 COM Flight CheckAfter the installation is complete, a flight check is required to ensure satisfactory performance. To checkthe communications transceiver, maintain an appropriate altitude and contact a ground station facility at arange of at least 50 nautical miles. Contact a ground station in close proximity. Press the COM volumeknob to select manual squelch and listen for any unusual electrical noise, which would increase the squelchthreshold. If possible, verify the communications capability on both the high, low, and mid bands of theVHF COM band. It may be required by the governing regulatory agency to verify operation of the COMtransmitter and receiver at the extents of a ground facility’s service volume (e.g. FAA AC 23-8A).6.7.2 VOR Flight Check (GNC Only)1. Tune a local VOR station within 50 miles.2. Verify the audio IDENT and voice quality and verify that no objectionable electrical interferencesuch as magneto noise is present.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.It may be required by the governing regulatory agency to verify operation of the VOR receiver at theextents of a ground facility’s service volume (e.g. FAA AC 23-8A).6.7.3 ILS Flight Check (GNC Only)1. Tune an ILS at a local airport.2. Verify the audio IDENT and audio quality and verify that no objectionable electrical interferencesuch as magneto noise is present.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.