TT26 ADS-B Transponder Installation Manual 01633-00-AC 24 January 2017 Trig Avionics Limited Heriot Watt Research Park Riccarton, Edinburgh EH14 4AP Scotland, UK Copyright Trig Avionics Limited, 2016
This page intentionally left blank
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC CONTENTS 1. 2. PREFACE ...............................................................................................4 1.1 PURPOSE ...........................................................................................4 1.2 SCOPE ...............................................................................................4 1.3 CHANGES FROM PREVIOUS ISSUE......................................................4 1.
TT26 ADS-B Transponder Installation Manual 01633-00 5.4 TT26 TRANSPONDER ELECTRICAL CONNECTIONS ..........................12 5.4.1 5.5 6. 24 January 2017 Issue AC TT26 Interface – Pinout .........................................................13 TT26 TRANSPONDER INTERFACE DETAILS .....................................14 5.5.1 Power Input ............................................................................14 5.5.2 TMAP Control Port ...........................................................
TT26 ADS-B Transponder Installation Manual 01633-00 6.2 24 January 2017 Issue AC INTERFACE CONFIGURATION ...........................................................20 6.2.1 Altimetry Source .....................................................................20 6.2.2 GPS Source ............................................................................21 7. POST INSTALLATION CHECKS ....................................................22 8. CONTINUED AIRWORTHINESS ..................................
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 1. Preface 1.1 Purpose This manual describes the physical and electrical characteristics and the installation requirements for a TT26 ADS-B transponder. 1.2 Scope This document applies to the installation of the TT26 ADS-B Transponder. At the publication date of this manual the software version identifier for the TT26 is 1.6 and the FPGA version identifier is 1.5.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 2. Introduction 2.1 TT26 Description The TT26 ADS-B transponder system is an ED-73E compliant Mode S level 2els datalink transponder, with support for ADS-B extended squitter, elementary surveillance and SI codes, which also meets the relevant environmental requirements of ED-14G. The TT26 has a nominal power output of 250 watts, and meets the power output requirements for Class 1.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC connector and a static pressure connector. The 25 way D-type interface provides the following services: Power Input The TT26 operates on 11 to 33 volts DC. Controller Datalink A two wire data link is used to connect the TT26 and the controller. Depending on TT26 option, this interface can be provided over a half-duplex RS-485 interface (TMAP RS-485 bus) or a full duplex RS-232 interface (TMAP over RS-232).
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 3. Technical Specifications 3.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC Physical Specifications (including connectors) Height 62 mm (2.44”) Width 71.5 mm (2.81”) Length 153 mm (6.02”) Weight 475 g (1.05 lbs) 3.2 Installation Approval The conditions and tests required for the TSO approval of the TT26 are minimum performance standards.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 4. Unit and Accessories supplied 4.1 TT26 ADS-B Transponder Items The TT26 includes the following items: Unit Description TT26 Mode S Transponder Qty Part Number 1 01629-00 4.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC Fixings. To mount the transponder body directly using the tapped holes you will need three M4 bolts.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 5. Installation 5.1 Unpacking and Inspecting Equipment Carefully unpack the transponder and make a visual inspection of the unit for evidence of any damage incurred during shipment. If the unit is damaged, notify the shipping company to file a claim for the damage. To justify your claim, save the original shipping container and all packaging materials. 5.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 5.3 Cooling Requirements The TT26 ADS-B transponder meets all applicable ETSO requirements without forced air-cooling. Attention should however be given to the incorporation of cooling provisions to limit the maximum operating temperature if the TT26 is installed in close proximity to other avionics. The reliability of equipment operating in close proximity in an avionics bay can be degraded if adequate cooling is not provided.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 5.4.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC The following diagram shows the connector orientation as viewed from the wiring side. 5.5 TT26 Transponder Interface Details 5.5.1 Power Input The power supply can be 11-33 volts DC; no voltage adjustment is required. Use a 3 Amp (or greater) circuit breaker for power supply protection to the TT26. It is always good practice to use more than one ground wire in an installation.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 5.5.2.1 TMAP over RS-485 Bus Each TMAP RS485 interface comprises a balanced pair of signals, called A and B, both of which must be connected for communication to work. There are two sets of TMAP pins on the TT26, TMAP1 A and B, and TMAP2 A and B. This is to support future installation wiring options.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 5.5.5 Squat Switch Input The Squat switch input allows the transponder to automatically switch between Airborne and Ground modes, and affects both the Mode S reply behaviour and the ADS-B reporting behaviour. The input will be asserted when the voltage to ground is pulled below approximately 4 volts. The logical sense of the input can be programmed to be either active low or active high.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC compliant, so the combination will crimp the supplied connectors. Once crimped, the contacts should be slotted into the rear of the connector shell. Push the contact in until the retaining tab clicks into place. Tug gently to confirm the contact is locked in place. 5.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC connectors should be less than 10dB. 5.10 Transponder Antenna The TT26 is compatible with any transponder antenna approved to ETSO or TSO C74 or C112. 5.11 Transponder Antenna Cable A low loss cable terminating at the transponder in a TNC connector is required. The TT26 is designed to meet Class 1 requirements with an allowance of 2 dB for loss in the connectors and cable used to connect it to the antenna.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 6. Installation Setup and Test The system controller uses the TMAP protocol to provide important system parameters to the TT26, including the Mode S address. The following items should be configured in the system controller. 6.1 Core Configuration Items 6.1.1 Aircraft Address The Mode S Address is a 24 bit number issued to the aircraft by the registration authority for the aircraft.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 6.1.5 Squat Switch Source The Squat switch input allows the TT26 to automatically switch between Airborne and Ground modes. If the squat switch input is not connected the “Ignore Squat Switch” option must be selected. 6.1.6 Aircraft Length and Width On the ground, ADS-B transmits encoded aircraft size information which is used by ATC to identify taxiing routes and potential conflicts.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC computer, or to receive the altimetry data over the link from the controller. In all three cases the altimetry data will be transmitted from the secondary data output (either RS232 or RS485, depending on which port is the control port). This output uses Shadin S format messages at 9600 bps. Only the D, a and b records are provided, as well as the Shadin checksum.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 7. 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. Interrogations to verify the receiver sensitivity.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 8. Continued Airworthiness Other than for periodic functional checks required by the regulations, the TT26 ADS-B transponder has been designed and manufactured to allow “on condition maintenance”. This means that there are no periodic service requirements necessary to maintain continued airworthiness, and no maintenance is required until the equipment does not properly perform its intended function.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 9. Limited Warranty Trig Avionics Limited warrants our products to be free from defects in materials and workmanship for a period of six (6) months from the date of installation by an authorised dealer.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 10. Environmental Qualification Forms Nomenclature: TT26 ADS-B Transponder Part Number: 01629-00-(xx) ETSO: C112e, C166b, C10b, C88b, C145c Manufacturer: Trig Avionics Limited Address: Heriot Watt Research Park, Riccarton, Currie, Scotland, EH14 4AP Conditions DO-160G Section Description of Conducted Tests Temperature and Altitude 4.0 Low temperature ground survival 4.5.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC Crash Safety 7.3 Equipment tested to Category B type 5 Vibration 8.0 Aircraft zone 2; type 3, 4, 5 to category S level M, type 1 (Helicopters) to category U level G Explosion 9.0 Equipment identified as Category X – no test required Waterproofness 10.0 Equipment identified as Category X – no test required Fluids Susceptibility 11.0 Equipment identified as Category X – no test required Sand and Dust 12.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 11. ADS-B Compliance TT26 ADS-B transponders include support for Extended Squitter ADS-B out. The TT26 is a DO-260B compliant broadcast participant. 11.1 ADS-B Parameters Supported The following table summarises the ADS-B parameters that are transmitted by the TT26.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC Emergency Status 6,1 Quality Indicator (NACp) 6,5 Quality Indicator (NACv) 6,5 Quality Indicator (SIL) 6,5 Version Indicator 6,5 Surface Length/Width 6,5 Surface Antenna Offset 6,5 In all cases, uncompensated latency due to the transponder and internal GPS is less than 150 milliseconds. 11.2 FAA 91.227 Compliance A TT26 can form the basis of 14 CFR 91.227 compliant ADS-B installation.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 12. Installation Drawings 12.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 12.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC 13.
TT26 ADS-B Transponder Installation Manual 01633-00 24 January 2017 Issue AC This page intentionally left blank ______________________ Page 32 Trig Avionics Limited
