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TT26 ADS-B Transponder Installation Manual

24 January 2017

01633-00

Issue AC

______________________

Trig Avionics Limited

9

4. Unit and Accessories supplied

4.1 TT26 ADS-B Transponder Items

The TT26 includes the following items:

Unit Description

Qty

Part Number

TT26 Mode S Transponder

1

01629-00

4.2 Installation Kit

The optional TT26 installation kit includes the following items:

Unit Description

Qty

Part Number

Connector, coaxial TNC

1

00723-00

Headshell, 25 way

1

00726-00

25 way D-type contact housing (female)

1

00866-00

Crimp Terminal, Female, 22-24 AWG

20

00730-00

Hose clip, small

2

00734-00

Connector, coaxial SMA

1

01645-00

4.3 Required Items

Additional items you will require, but which are not in the TT26 package,
include:



Antenna and fixing hardware. The TT26 is compatible with any
transponder antenna approved to ETSO C74 or C112, and any GPS
antenna approved to ETSO or TSO C190.



Cables. You need to supply and fabricate all required cables.
Guidance on cable types is given in section 5 below.

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Summary of Contents for 01629-00

Page 1: ...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 ...

Page 2: ...This page intentionally left blank ...

Page 3: ...2 INTRODUCTION 5 2 1 TT26 DESCRIPTION 5 2 2 INTERFACES 5 2 2 1 TT26 ADS B Transponder Unit 5 3 TECHNICAL SPECIFICATIONS 7 3 1 TT26 TRANSPONDER UNIT 01629 00 7 3 2 INSTALLATION APPROVAL 8 3 3 NON ETSO FUNCTION 8 4 UNIT AND ACCESSORIES SUPPLIED 9 4 1 TT26 ADS B TRANSPONDER ITEMS 9 4 2 INSTALLATION KIT 9 4 3 REQUIRED ITEMS 9 5 INSTALLATION 11 5 1 UNPACKING AND INSPECTING EQUIPMENT 11 5 2 TRANSPONDER ...

Page 4: ... 5 5 4 Auxiliary Power 15 5 5 5 Squat Switch Input 16 5 6 D CONNECTOR CRIMP TERMINALS 16 5 7 WIRING CONSIDERATIONS 17 5 8 GPS ANTENNA 17 5 9 GPS ANTENNA CABLE 17 5 10 TRANSPONDER ANTENNA 18 5 11 TRANSPONDER ANTENNA CABLE 18 5 12 STATIC PRESSURE CONNECTION 18 6 INSTALLATION SETUP AND TEST 19 6 1 CORE CONFIGURATION ITEMS 19 6 1 1 Aircraft Address 19 6 1 2 Aircraft Registration 19 6 1 3 Aircraft Spee...

Page 5: ... 20 6 2 2 GPS Source 21 7 POST INSTALLATION CHECKS 22 8 CONTINUED AIRWORTHINESS 23 9 LIMITED WARRANTY 24 10 ENVIRONMENTAL QUALIFICATION FORMS 25 11 ADS B COMPLIANCE 27 11 1 ADS B PARAMETERS SUPPORTED 27 11 2 FAA 91 227 COMPLIANCE 28 11 3 AMC 20 24 COMPLIANCE 28 12 INSTALLATION DRAWINGS 29 12 1 DIRECT CHASSIS MOUNT 29 12 2 CONNECTOR ARRANGEMENT 30 13 BASIC INTERCONNECT DIAGRAM 31 ...

Page 6: ... 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 The software and FPGA versions are subject to change without notice 1 3 Changes from Previous Issue Section 1 4 and 5 5 2 Added document reference for TMAP specification Section 3 1 Added C145c class information Section 4 1 and 5 2 Removal of quick re...

Page 7: ...B class B1S The built in pressure sensor provides altitude measurement up to 70 000 feet The TT26 is certified to ETSO C10b ETSO C88b ETSO C145c ETSO C112e and ETSO C166b A2 The TT26 is controlled using a separate controller the controller forms part of the system and is required for full compliance with the altimetry TSO and transponder TSO The TT26 runs from either 14 volt nominal or 28 volt nom...

Page 8: ...6 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 Second Datalink A secondary RS 232 interface provides access to GPS data On ground input Allows automatic flight ground m...

Page 9: ...uments EUROCAE ED 73E EUROCAE ED 14G RTCA DO 160G RTCA DO 181E RTCA DO 260B AS8003 AS392C DO 229D Software ED 12B RTCA DO 178B Level B Hardware DO 254 Level C Power Requirements 11 33 volts DC Typical 8 watts 14Volts Altitude 70 000 feet Humidity Tested to Category A in DO 160G Operating Temperature 55 C to 55 C Transmitter Frequency 1090MHz 1MHz Transmitter Power 250 watts nominal 125 watts minim...

Page 10: ... on or within a specific type or class of aircraft to determine that the aircraft operating conditions are within the TSO standards The transponder may be installed only if further evaluation by the user installer documents an acceptable installation that is approved by the appropriate airworthiness authority 3 3 Non ETSO Function The internal altimeter has been qualified to operate at altitudes o...

Page 11: ... Qty Part Number Connector coaxial TNC 1 00723 00 Headshell 25 way 1 00726 00 25 way D type contact housing female 1 00866 00 Crimp Terminal Female 22 24 AWG 20 00730 00 Hose clip small 2 00734 00 Connector coaxial SMA 1 01645 00 4 3 Required Items Additional items you will require but which are not in the TT26 package include Antenna and fixing hardware The TT26 is compatible with any transponder...

Page 12: ...Transponder Installation Manual 24 January 2017 01633 00 Issue AC ______________________ 10 Trig Avionics Limited Fixings To mount the transponder body directly using the tapped holes you will need three M4 bolts ...

Page 13: ... not too close to any high external heat source Avoid sharp bends and placing the cables too near to the aircraft control cables The TT26 transponder is mounted directly to the airframe using bolts into the three threaded holes in the chassis Section 12 contains mounting point positions To mount the transponder to the airframe proceed as follows Ensure that the chassis of the TT26 is flush with th...

Page 14: ...ovisions 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 5 4 TT26 Transponder Electrical Connections The TT26 has a single 25 way male connector which provides the data and power inputs to the transponder A single ...

Page 15: ... TMAP1B Bidirectional 4 Ground 5 RS 232 Aux Input 6 Ground 7 RS 232 Aux Output 8 TMAP2A Bidirectional 9 TMAP2B Bidirectional 10 Ground 11 Auxiliary Power Output 12 Ground 13 Not Connected 14 Ground 15 11 33 VDC Power Input 16 Reserved 17 Not Connected 18 Not Connected 19 Squat In Input 20 Not Connected 21 Not Connected 22 Not Connected 23 Not Connected 24 RS 232 Control RX Input 25 RS 232 Control ...

Page 16: ...ne ground wire in an installation This is particularly important when the transponder is mounted on a non conducting surface such as a composite structure With only one wire there could be only a single grounding path for the transponder controller and antenna 5 5 2 TMAP Control Port TMAP is a Trig serial protocol that provides a bi directional interface between the TT26 and a control system The p...

Page 17: ... levels 5 5 2 3 Secondary Port The unused RS 485 or RS 232 interface that is not being used as a control port will be available for Altimetry input and output The behaviour of the input depends on system configuration defined below The output always reflects the current altimetry source regardless of input configuration Note The TMAP RS 485 interface is optional and may not be present on systems u...

Page 18: ...d connections and are easier to assemble in situ in an aircraft where soldering is impractical They also allow individual wires to be removed and replaced in a receptacle without replacing the whole connector The socket contacts used in the 25 way connector conform to MIL part number M39029 63 368 and are suitable for wire gauges from 20 to 24 AWG These contacts are widely used in avionics install...

Page 19: ... interface In a certified installation the normal wire choice would be Tefzel hook up wire Wire of 20 AWG is more than adequate for the task in installations where weight is an issue wire of 22 or 24 AWG can also be used Where lighter wires than 20 AWG are used the individual wires should be laced together for support 5 8 GPS Antenna The TT26 is compatible with any GPS antenna approved to ETSO or ...

Page 20: ...dB loss for the connector at each end of the antenna cable assembly leaves an allowance of 1 5dB maximum loss for the cable itself An acceptable cable Has less than 1 5dB loss for the run length needed Has a characteristic impedance of 50 Ohms Has double braid screens or has a foil and braid screen For cable runs of less than 2 5 metres RG400 is a good choice 5 12 Static Pressure Connection The TT...

Page 21: ...mber although you may also encounter one written as an 8 digit octal number 6 1 2 Aircraft Registration The aircraft registration is the unique alphanumeric string that identifies the aircraft It used as the default flight ID 6 1 3 Aircraft Speed Class Mode S transponders can transmit their maximum airspeed characteristics to aircraft equipped with TCAS This information is used to help identify th...

Page 22: ... instead it usually reports the location of the actual GPS antenna not the GPS receiver In normal flight operations this distinction is of no practical importance at all but if ADS B is used to manage taxiway conflicts a significant offset in antenna position could mean that the aircraft is not in the same place as the ADS B reported position Although primarily intended for position correction on ...

Page 23: ... as the Shadin checksum If the system is configured to use external air data the input protocol expected is also Shadin S format 6 2 2 GPS Source The transponder has an internal GPS receiver and that is the primary position source for ADS B operation The GPS data is routed internally to the transponder and is also transmitted on the auxiliary serial port pin 7 The internal GPS can be disabled and ...

Page 24: ...ogations to verify the receiver sensitivity A Mode S transponder should have a minimum triggering level MTL of between 77 dBm and 71 dBm Failure to meet this requirement usually indicates antenna or coaxial cable problems Interrogations to verify the transmitted power The installation should have no less than 125 watts at the antenna and no more than 500 watts Failure to meet this requirement is a...

Page 25: ...signed 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 When service is required a complete performance test should be accomplished following any repair action Repairs should only be carried out...

Page 26: ... normal wear All warranties are F O B Trig Avionics Limited Heriot Watt Research Park Riccarton Currie EH14 4AP Trig Avionics will not accept or pay for any charges for warranty work performed outside our factory without prior written consent This warranty applies only to products in normal use It does not apply to units or circuit boards defective due to improper installation physical damage tamp...

Page 27: ...sts Temperature and Altitude 4 0 Category E1 Low temperature ground survival 4 5 1 55 C Low temperature short time operating 4 5 1 55 C Low temperature operating 4 5 2 55 C High temperature operating 4 5 4 55 C High temperature short time operating 4 5 3 55 C High temperature ground survival 4 5 3 85 C Loss of Cooling 4 5 5 Cooling air not required 55 C operating without cooling air Altitude 4 6 1...

Page 28: ...t Spray 14 0 Equipment identified as Category X no test required Magnetic Effect 15 0 Equipment tested to Category Z 0 3m Power Input 16 0 Equipment tested to Category BXX Voltage Spike 17 0 Equipment tested to Category B Audio frequency conducted susceptibility 18 0 Equipment tested to Category B Induced signal susceptibility 19 0 Equipment tested to Category AC Radio frequency susceptibility 20 ...

Page 29: ... The following table summarises the ADS B parameters that are transmitted by the TT26 Parameter BDS Register SPI 0 5 Emergency Indicator 0 5 Barometric Altitude 0 5 Quality Indicator NIC 0 5 Airborne Position Latitude 0 5 Longitude 0 5 Quality Indicator NIC 0 6 Surface Position Latitude 0 6 Longitude 0 6 Surface Ground Speed 0 6 Surface Ground Track 0 6 Aircraft Identification 0 8 Airborne Ground ...

Page 30: ...ernal 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 For installations seeking certification to 91 227 or other applicable standards additional compliance information is available on request from Trig Avionics Limited 11 3 AMC 20 24 Compliance A TT26 can form the basis of an AMC 20 24 compliant ADS B installation...

Page 31: ...26 ADS B Transponder Installation Manual 24 January 2017 01633 00 Issue AC ______________________ Trig Avionics Limited 29 12 Installation Drawings 12 1 Direct Chassis Mount All dimensions in millimetres ...

Page 32: ...allation Manual 24 January 2017 01633 00 Issue AC ______________________ 30 Trig Avionics Limited 12 2 Connector Arrangement GPS Antenna Transponder Antenna TT26 Interface Static Pressure Connection All dimensions in millimetres ...

Page 33: ...TT26 ADS B Transponder Installation Manual 24 January 2017 01633 00 Issue AC ______________________ Trig Avionics Limited Page 31 13 Basic Interconnect Diagram ...

Page 34: ...TT26 ADS B Transponder Installation Manual 24 January 2017 01633 00 Issue AC ______________________ Page 32 Trig Avionics Limited This page intentionally left blank ...

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