Garmin GTX327 Installation Manual

Also see for GTX 327: Pilot's guide Pilot's guide Installation manual Pilot's guide Pilot's guide

GTX 327 Installation Manual Page 1-1190-00187-02 Revision K1 GENERAL DESCRIPTION1.1 IntroductionThis manual presents the mechanical, and electrical installation requirements for the GTX 327 DigitalDisplay Mode A/C Transponder. After installation of the GTX 327, FAA Form 337 must be completedby an appropriately certificated agency and ATC transponder tests required by 14 CFR, Part 91.413 mustbe completed to return the aircraft to service.1.2 Equipment DescriptionThe Garmin GTX 327 is a panel-mounted transponder with the addition of altitude reporting and timingfunctions. The transponder is a radio transmitter and receiver that operates on radar frequencies,receiving ground radar or TCAS interrogations at 1030 MHz and transmitting a coded response of pulsesto ground-based radar on a frequency of 1090 MHz.As with other Mode A/Mode C transponders, the GTX 327 replies with any one of 4,096 codes, whichdiffer in the position and number of pulses transmitted. By replying to ground transmissions or TCASinterrogations, the GTX 327 enables ATC to display aircraft identification, altitude and groundspeed onATC radar screens or TCAS traffic indicators. The GTX 327 is equipped with IDENT capability thatactivates the Special Position Identification (SPI) pulse for 18 seconds.The GTX 327 is configured with all key controls. The layout of the front panel keys and displayssegregates the transponder’s primary functions from the secondary timing functions. The unit can beconfigured so the aircraft avionics master bus can turn the unit on.The GTX 327 can also be incorporated in installations with other compatible control/display units such asthe Garmin GNS 480 (CNX80).Provision is made for unit software upgrade by means of RS-232 data transfer through rear connectorpins. The installation of an optional connector is highly recommended. If the optional connector isplaced in the aircraft, transponder removal and reinstallation for software upgrade is not required. Thesoftware can be changed while the unit is still mounted inside the aircraft.CAUTIONThe GTX 327 lens is coated with a special anti-reflective coating, whichis very sensitive to skin oils, waxes and abrasive cleaners. CLEANERSCONTAINING AMMONIA WILL HARM THE ANTI-REFLECTIVECOATING. It is very important to clean the lens using a clean, lint freecloth and an eyeglass lens cleaner that is specified as safe foranti-reflective coatings.