TT21 Mode S Transponder Installation Manual 00560-00-AA 19 January 2009 Trig Avionics Limited Heriot Watt Research Park Riccarton, Currie EH14 4AP Scotland, UK Copyright Trig Avionics Limited, 2009
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TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA CONTENTS 1. 2. 3. 4. 5. PREFACE ....................................................................................................................................... 1 1.1 PURPOSE.................................................................................................................................... 1 1.2 SCOPE .........................................................................................................
TT21 Transponder Installation Manual 00560-00 5.7 TC20 CONTROLLER ELECTRICAL CONNECTIONS .................................................................... 10 5.7.1 5.8 TC20 Interface - Pinout.................................................................................................. 10 TC20 CONTROLLER INTERFACE DETAILS ................................................................................ 10 5.8.1 TMAP Bus..............................................................................
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 8.6 ALTITUDE ENCODER WARM UP .............................................................................................. 22 8.7 GENERAL LOW TEMPERATURE OPERATION............................................................................. 22 8.8 WARNING MESSAGES .............................................................................................................. 22 8.9 FAULT ANNUNCIATION..............................
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA This page intentionally left blank ______________________ iv Trig Avionics Limited
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 1. Preface 1.1 Purpose This manual describes the physical and electrical characteristics and the installation requirements for a TT21 Mode S Transponder and associated TC20 controller. 1.2 Scope This document applies to the installation of the TT21 Mode S Transponder. At the publication date of this manual the software version identifier for the TT21 is 1.1 and the FPGA version identifier is 1.1.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 2. Introduction 2.1 TT21 Description The TT21 Mode S transponder system is an ED-73B Class 2 compliant Mode S level 2 datalink transponder, with support for extended squitter, which also meets the relevant environmental requirements of ED-14D. It is certified to ETSO 2C112b and ETSO C166a. The TT21 transponder is controlled using a separate front panel controller, called the TC20.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 3. Technical Specifications 3.1 TT21 Transponder Unit (00675-00) Specification Characteristics Compliance ETSO 2C112b Class 2 Level 2es, ETSO C166a Class B0 FCC Identification VZI00675 Applicable documents EuroCAE ED-73B, EuroCAE ED-14E (RTCA DO-160E), RTCA DO-181D, RTCA DO-260A change 2 Software ED-12B (RTCA DO-178B) Level B Hardware DO-254 Level C Power Requirements 11 – 33 Volts DC. Typical 5 Watts @ 14Volts.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 3.2 TC20 Control Unit (00649-00) Specification Characteristics Compliance ETSO 2C112b, ETSO C88a Applicable documents EuroCAE ED-73B, EuroCAE ED-14E (RTCA DO-160E), RTCA DO-181D, SAE 8003 Software ED-12B (RTCA DO-178B) Level B Altitude -1000 to 35,000 feet Humidity 95% @ +50°C for 6 hours; 85% @ +38°C for 16 hours.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 4. Unit and Accessories supplied 4.1 TT21 Mode S Transponder Items The TT21 Mode S transponder includes the following items: Unit Description Qty Part Number TT21 Mode S Transponder 1 00675-00 TT21 Mounting Tray 1 00667-00 4.2 TC20 Controller Items The TC20 controller includes the following items: Unit Description Qty Part Number TC20 Transponder Controller 1 00649-00 TT21 Installation Kit 1 00668-00 4.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 4.4 Required Items Additional items you will require, but which are not in the TT21 package, include: Antenna and fixing hardware. The TT21 is compatible with any transponder antenna approved to ETSO C74 or 2C112. Cables. You need to supply and fabricate all required cables. Guidance on cable types is given in section 5 below. Fixings.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 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.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA provided. 5.5 TT21 Transponder Electrical Connections The TT21 has a single 25 way female socket which provides the data and power inputs to the transponder. A single TNC coaxial connector attaches to the antenna. 5.5.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 5.6 TT21 Transponder Interface Details 5.6.1 Power Input The power supply can be 11-33 Volts DC; no voltage adjustment is required. Use a 3 Amp circuit breaker for power supply protection to the TT21. 5.6.2 TMAP Bus TMAP is a Trig proprietary bus based on RS485 signalling. It provides a bi-directional interface between the transponder and the control head.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 5.6.8 External Standby Input This input, when held low, places the transponder in Standby mode. It should be used to switch between transponders in an installation with two transponders. The input is active low, and will be asserted when the voltage to ground is pulled below approximately 4 Volts. 5.6.9 GPS Position Input The GPS position input is required to support ADS-B functionality.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA signals, called A and B, both of which must be connected for communication to work. TMAP A and B lines on the controller should be connected to the corresponding A and B lines of either TMAP1 or TMAP2 on the TT21. 5.8.2 Altitude Out The TC20 incorporates an altitude encoder. Certain GPS receivers can benefit from having altitude information supplied to them.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA AWG 24 AWG 99 5.0 m An alternative to a harness built from individual wires, particularly for a long cable run, is to use a multi-core cable. Aviation grade cable with 6 or more cores is often more expensive than the individual wires, and therefore is not generally a good choice for a certified aircraft.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA connectors and cable used to connect it to the antenna. Excessive loss will degrade both transmitter output power and receiver sensitivity. Allowing 0.25dB 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.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 5.11.3 TNC Connector This section describes the technique for attaching the antenna cable to the supplied TNC connector. If a low-loss cable is needed that has too large a dielectric diameter to fit the supplied connector, a short length (up to 150mm or 6 inches) of smaller cable may be used with suitable mating connectors to adapt to the transponder connector.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA The following diagram shows the general arrangement, although other combinations may be used: For aircraft with ¼ inch static lines, two adapters are provided which can convert from ¼ inch inside diameter hoses to the 5 mm hose in the install kit. In all cases, the static line should include drainage provisions and should be routed in accordance with CS 23.1325 or other applicable airworthiness provisions for the aircraft.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 6. Installation Setup and Test The TT21 uses a simple setup system to program important system parameters, including the Mode S address. In the original factory configuration, the setup screen is the first thing that runs when you switch on the transponder.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 6.1.4 Airspeed Category Mode S transponders can transmit their maximum airspeed characteristics to aircraft equipped with TCAS. This information is used to help identify threats and to plan avoiding action by the TCAS equipped aircraft. The airspeeds are grouped in ranges; using the rotary knob, select the range that corresponds to the aircraft. 6.1.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 6.1.11 ADS-B Test Message Option Because of limitations in the ATC radar computer systems, in US airspace the FAA require ADS-B equipped aircraft to periodically transmit their Mode A squawk code in an ADS-B squitter message. This allows the computer system to reconcile conventional radar traces with ADS-B information in a mixed surveillance environment.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA altitude point adjusts the correspondence at the altitude limit of the encoder. Since the altitude limit of the encoder is likely to be higher than the service ceiling of the aircraft, it is sufficient to set the upper adjustment at the service ceiling of the aircraft. Note: DO NOT EXCEED THE ALTITUDE OR RATE OF CLIMB LIMITS OF THE PITOTSTATIC INSTRUMENTS OF THE AIRCRAFT.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 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.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 8. Normal Operation 8.1 Overview On the front panel is a monochrome LCD display flanked by a rotary mode selector knob (OFF, SBY, GND, ON, and ALT) and a continuously rotating knob used for code and data entry. 8.2 Display The display shows the operating mode of the transponder, the reported pressure altitude, and the current squawk code and Flight ID. The reply indicator is active when the transponder replies to interrogations.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA replies for 18 seconds. IDT will appear in the display. FN Pressing the FN button provides access to changing the Flight ID. VFR Pressing the VFR button sets the transponder to the preprogrammed conspicuity code. Pressing the button again restores the previous squawk code. ENT The ENT button enters a digit in the code selector. 8.5 Code Selector Knob The right hand knob is used to set squawk codes and the Flight ID.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA Note the FAULT message shown on the screen and pass that information to your avionics maintenance organisation.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 9. Continued Airworthiness Other than for periodic functional checks required by the regulations, the TT21 Mode S 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.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 10. Limited Warranty Trig Avionics Limited warrants our products to be free from defects in materials and workmanship for a period of two (2) years from the date of installation by an authorised dealer. This warranty covers repair and/or replacement at our option, of any parts found to be defective, provided such defects in our opinion are due to faulty material or workmanship and are not caused by tampering, abuse, or normal wear.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 11. Environmental Qualification Forms Nomenclature TT21 Mode S Transponder Part Number: 00675-(XX) ETSO: 2C112b, C166a Manufacturer Trig Avionics Limited Address Heriot Watt Research Park, Riccarton, Currie, Scotland, EH14 4AP Conditions Temperature and Altitude DO-160E Section 4.0 Description of Conducted Tests Equipment tested to Categories A2, C1 Low temperature ground survival 4.5.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA Nomenclature TC20 Mode S Controller Part Number: 00649-(XX) Manufacturer Trig Avionics Limited Address Heriot Watt Research Park, Riccarton, Currie, Scotland, EH14 4AP Conditions Temperature and Altitude ETSO: DO-160E Section 4.0 2C112b, C88a Description of Conducted Tests Equipment tested to Categories A4, C4 Low temperature ground survival 4.5.1 -55°C Low temperature short-time operating 4.5.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 12. ADS-B Compliance TT21 transponders include support for Extended Squitter ADS-B out. The TT21 is a DO-260A change 2 compliant category B0 broadcast-only participant. 12.1 ADS-B Parameters Supported The following table lists the ADS-B parameters that are transmitted by the TT21 transponder when connected to an appropriate GPS receiver.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA installation and system attributes for the overall aircraft installation. AMC20-24 has been adopted as a base standard for ADS-B surveillance in other parts of the world, and provides radar-like separation capabilities between participating IFR aircraft.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 13. Installation Drawings 13.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 13.2 Front Panel Controller Dimensions Controller shown without the mounting adapters (00678-00) used for 57mm (2¼ inch) instrument mounting. All dimensions in millimetres.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 13.3 Front Panel Cut-out Options The front panel controller can be fitted to either the compact mounting hole or a conventional 57mm (2¼ inch) instrument cut-out. The compact mounting is a truncated 58 mm opening; please note that the mounting screws are NOT in the same location for the two options. All dimensions in millimetres.
TT21 Transponder Installation Manual 00560-00 19 January 2009 Issue AA 14.
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