Garmin GTX 23 Installation Manual

Also see for GTX 23: Installation manual

Contents

Garmin GTX 23 Installation Manual Manual pdf 10 page image

190-00906-01 GTX 23 Installation ManualRev. C Page 1-11 GENERAL DESCRIPTION1.1 IntroductionThis manual is intended to provide mechanical and electrical information for use in the planning anddesign of an installation of the GTX 23 into an aircraft. This manual is not a substitute for an approvedairframe-specific maintenance manual, installation design drawing, or complete installation data package.Attempting to install equipment by reference to this manual alone and without first planning or designingan installation specific to your aircraft may compromise your safety and is not recommended. The contentof this manual assumes use by competent and qualified avionics engineering personnel and/or avionicsinstallation specialists using standard aviation maintenance practices in accordance with Title 14 of theCode of Federal Regulations and other relevant accepted practices. This manual is not intended for use byindividuals who do not possess the competencies and abilities set forth above.NOTEGarmin recommends installation of the GTX 23 by a Garmin-authorized installer. To theextent allowable by law, Garmin will not be liable for damages resulting from improper ornegligent installation of the GTX 23. For questions, please contact Garmin AviationProduct Support at 1-888-606-5482.1.2 Equipment DescriptionThe Garmin GTX 23 remote-mounted Mode S Transponder is a radio transmitter and receiver thatoperates on radar frequencies. It receives ground radar and TCAS interrogations at 1030 MHz, and ittransmits a coded response of pulses at 1090 MHz. The GTX 23 replies to Mode A, Mode C, and Mode Sinterrogations. Mode A replies consist of framing pulses and any one of 4,096 codes, which differ in theposition and number of pulses transmitted. Mode C replies include framing pulses and encoded pressurealtitude. Mode S replies can contain various information such as the Mode A code, Mode C altitude,ICAO address, and Elementary Surveillance and Enhanced Surveillance data described below.Features of the GTX 23 include support for ADS-B, TIS-A, mutual suppression, IDENT functionality, SIcodes, elementary surveillance (ELS), and enhanced surveillance (EHS). ADS-B, TIS-A, and mutualsuppression are discussed in following sections. IDENT functionality activates a Special PositionIdentification (SPI) pulse for 18 seconds in Mode A replies. This helps the air traffic controller confirmyour position on their radar screen. SI codes, ELS, and EHS better facilitate meeting various requirementsfor operation in European airspace. SI codes uniquely identify ground radar with overlapping coverage.Supporting SI codes enables reduction in ground infrastructure complexity. ICAO Annex 10, Volume IV,Amendment 77, paragraph 2.1.5.1.7.1 mandated SI code support. Elementary and Enhanced Surveillanceprovide additional aircraft parameters to ground radar systems (for ELS, see JAA TGL 13 rev 1 datedJune 01, 2003; for EHS, see AMC 20-13, which supersedes JAA NPA 20-12a). Elementary Surveillanceprovides a detailed transponder capability report and aircraft identification data (e.g. Flight ID or radio callsign). Additionally, TCAS II compatible transponders supporting ELS can provide resolution advisorydata if the aircraft is equipped with TCAS II. (ELS is Mode S BDS registers (1,0), (2,0), and (3,0).)Enhanced Surveillance provides selected vertical intention, track and turn reporting, and heading andspeed reporting. (EHS is Mode S BDS registers (4,0), (5,0), and (6,0).)