Garmin GTR 225 Installation Manual
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Garmin GTR 225 Installation Manual

Tso installation manual
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GTR 225/GNC 255
TSO Installation Manual
190-01182-02
March 2013
Revision B

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Summary of Contents for Garmin GTR 225

  • Page 1 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 March 2013 Revision B...
  • Page 3 Garmin. Garmin hereby grants permission to download a single copy of this manual and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed and to...
  • Page 4 Section 6 6-1 through 6-22 Section 7 7-1 through 7-2 Appendix A A-1 through A-2 Appendix B B-1 through B-20 Appendix C C-1 through C-10 Appendix D D-1 through D-26 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page B Rev. B...
  • Page 5 $1,000,000 under Section 2410 of the Export Administration Act of 1979. Include this notice with any reproduced portion of this document. This information in this document is subject to change without notice.Visit the Garmin web site (www.garmin.com) for current updates and supplemental information concerning the operation of Garmin products.
  • Page 6 Battery replacement and removal must be performed by professional services. CAUTION To avoid damage to the GTR 225 or GNC 255, take precautions to prevent Electro-Static Discharge (ESD) when handling the GTR, connectors, fan, and associated wiring. ESD damage can be prevented by touching an object that is of the same electrical potential as the unit before handling the unit itself.

  • Page 7: Table Of Contents

    Rack Installation ...........................4-5 4.7.2 GTR/GNC Unit Insertion and Removal ..................4-6 4.7.3 Unit Replacement .........................4-6 Antenna Installation and Connections .....................4-6 4.8.1 COM Antenna ..........................4-6 CONNECTOR PINOUT INFORMATION ...................5-1 Pin Function List ..........................5-1 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page iii...
  • Page 8 Load Database ..........................6-22 Documentation Checks ........................6-22 6.9.1 Airplane Flight Manual Supplement ..................6-22 PERIODIC MAINTENANCE ......................7-1 Equipment Calibration ........................7-1 VOR Checks ............................7-1 Cleaning ............................7-1 APPENDIX A ENVIRONMENTAL QUALIFICATION FORM ..........A-1 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page iv Rev. B...
  • Page 9 B.1 RS-232 Aviation Data Format ......................B-1 B.2 RS-232 NMEA Data Format ......................B-5 APPENDIX C MECHANICAL DRAWINGS ................C-1 C.1 Drawing List ............................ C-1 APPENDIX D INTERCONNECT DIAGRAMS ................D-1 D.1 Drawing List ............................D-1 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page v...
  • Page 10 Figure D-10. GNC - King Serial DME - Remote Mount Interconnect ..........D-18 Figure D-11. Parallel 2 of 5 DME Tuning Interconnect .................D-20 Figure D-12. Parallel Slip Code DME Tuning Interconnect ..............D-22 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page vi...
  • Page 11 Figure D-13. GNC - King Serial DME - Panel Mount Interconnect ............D-23 Figure D-14. GTR/GNC - GDU 620 Interconnect .................D-25 Figure D-15. GTR/GNC - GTN and GNS 400W/500W ................D-26 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page vii...
  • Page 12 Table B-1. Aviation Output Sentence Format ..................B-2 Table B-2. Type 2 Aviation Output Sentence Format ................B-4 Table B-3. Input Message Summary ...................... B-19 Table B-4. Output Message Summary ....................B-19 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page viii Rev. B...
  • Page 13 The table is current at the time of publication of this manual (see date on front cover) and is subject to change without notice. Authorized Garmin Sales and Service Centers are encouraged to access the most up-to-date bulletin and advisory information on the Garmin Dealer Resource web site at www.garmin.com using their Garmin-provided user name and...
  • Page 14 This page intentionally left blank GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page x Rev. B...

  • Page 15: General Description

    This manual is intended to provide mechanical and electrical information for use in the planning and design of an installation of the GTR 225, GTR 225A, GTR 225B, GNC 255A, or GNC 255B into an aircraft. This manual is not a substitute for an approved airframe-specific maintenance manual, installation design drawing, or complete installation data package.

  • Page 16: Technical Specifications

    GTR 225 Weight (Unit Only) 2.36 lbs (1.07 kg) GNC 255 Weight (Unit Only) 3.02 lbs (1.37 kg) GTR 225 (Installed with rack and connectors) 3.06 lbs (1.39 kg) GNC 255 (Installed with rack and connectors) 3.96 lbs (1.80 kg) 1.3.2...

  • Page 17: Display

    30 seconds time-out, reverts to receive Less than 5% distortion when the transmitter is at 85% modulation Demodulated Audio Distortion at 350 to 2500 Hz Sidetone 1.4 Vrms into a 500 Ω load 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 1-3...

  • Page 18: Vor Specifications

    IDENT tone of 1020 Hz Ident Tone is attenuated at least 20 dB down. The distortion in the receiver audio output does not exceed 10% at Audio Distortion all levels up to 100 mW. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 1-4 Rev. B...

  • Page 19: Loc Specifications

    IDENT tone of 1020 Hz Ident Tone is attenuated at least 20 dB down. The distortion in the receiver audio output does not exceed 10% at Audio Distortion all levels up to 100 mW. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 1-5...

  • Page 20: Glideslope Specifications

    Flag • 150 Hz modulation is absent. • 90 Hz modulation is absent. • 90 Hz and 150 Hz modulations are both absent. • RF signals are absent. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 1-6 Rev. B...

  • Page 21: Table 1-2. Gtr/Gnc Current Specifications

    [2] The specified current draw does not include the superflags. If connected, their current draw must be added to the specified current. The superflags will supply up to 320 ma each regardless of the input voltage. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 1-7...

  • Page 22: License Requirements

    The VHF transmitter in this equipment is guaranteed to meet Federal Communications Commission acceptance over the operating temperature range. Modifications not expressly approved by Garmin could invalidate the license and make it unlawful to operate the equipment. GTR 225/GNC 255 TSO Installation Manual...

  • Page 23: Regulatory Compliance

    C,E, H1,H2 006-B1374-03 thru -0( ) ED-23C [1] C - Complete TSO I - Incomplete TSO [2] ETSO-2C128 and ETSO-2C169a are not applicable to the GTR 225. 1.5.1 Non-TSO Functions There are no non-TSO functions. Table 1-4. System Functions System Function...

  • Page 24: Tso Deviations

    3. Garmin was granted a deviation from the TSO to use RTCA/DO-178B instead of an earlier version to demonstrate compliance for the verification and validation of the computer software. 1. Garmin was granted a deviation from the ETSO to have a deflection response of 0.5 to 2.7 ETSO-2C40c seconds.

  • Page 25: Gtr/Gnc Database

    (iv) damage caused by service performed by anyone who is not an authorized service provider of Garmin; or (v) damage to a product that has been modified or altered without the written permission of Garmin. In addition, Garmin reserves the right to refuse warranty claims against products or services that are obtained and/or used in contravention of the laws of any country.
  • Page 26 This page intentionally left blank GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 1-12 Rev. A...

  • Page 27: Limitations

    Part 27 aircraft. To meet requirements for Part 23 Class II, Class III and Class IV, and Part 27 aircraft, it may be necessary to install a second VHF communications radio. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 2-1...
  • Page 28 This page intentionally left blank GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 2-2 Rev. A...

  • Page 29: Installation Overview

    In accordance with Canadian Radio Specifications Standard 102 (RSS 102), RF field strength exposure to persons from an antenna connected to this device should be limited to 60V/m for controlled environment and 28 V/m for uncontrolled environment. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 3-1...

  • Page 30: Interference Of Gps

    Locate the COM antenna as far as possible from all GPS antennas. If a COM antenna is found to be the problem, a 1.57542 GHz notch filter (Garmin P/N 330-00067-00) may be installed in the VHF COM coax, as close to the COM as possible. This filter is not required for the GTR/GNC transmitter.

  • Page 31: Cabling And Wiring Considerations

    Use 22 or 24 AWG wire for all connections. For power and ground, use the wire gauge specified in the interconnect drawing, then 22 AWG for the short length from the splice to the connector. Avoid sharp bends. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 3-3...

  • Page 32: Air Circulation And Cooling

    After reconfiguring the avionics in the cockpit panel, if the GTR/GNC unit is mounted less than 12 inches from the compass, recalibrate the compass and make the necessary changes for noting correction data. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 3-4 Rev.

  • Page 33: Installation Procedures

    GPS 1.57542 GHz Notch Filter 330-00067-00 Connector, TNC, Male, Clamp 031-4452 [1] [1] This part is not available from Garmin. Vendor Contact Information (provided for convenience only): Amphenol RF, Four Old Newtown Road, Danbury, CT 06810 Phone: 800-627-7100 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev.

  • Page 34: Optional Reference Material

    Push/Pull (manually resettable) Circuit Breakers  Tie Wraps or Lacing Cord  Ring Terminals (for grounding)  Coaxial Cable (RG-400, RG-142B or equivalent – Refer to Table 4.8 for additional information) GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 4-2 Rev. B...

  • Page 35: Special Tools Required

    274-7048-000MIL 91067-1 601966-1 601966-6 2031838-1 M81969/14-01 Daniels AFM8 M81969/1-04 M81969/14-01 Astro 615717 615725 M81969/1-04 NOTE Insertion/extraction tools from ITT Cannon are all plastic; others are plastic with metal tip. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 4-3...

  • Page 36: Coaxial Cable Installation

    EXCESS BRAID. SOLDER CONTACT TO CENTER CONDUCTOR . 5. INSERT CABLE CLAMP AND GASKET INTO CONNECTOR BODY MAKING SURE THAT SHARP EDGE OF CLAMP SEATS PROPERLY AND TIGHTEN NUT . Figure 4-1. Coaxial Cable Installation GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 4-4 Rev. B...

  • Page 37: Equipment Mounting

    [2] Contacts listed are not to be used for configuration module wiring. Use the contacts supplied with the configuration module when installing configuration module wires in P1001. [3] Non-Garmin part numbers shown are not maintained by Garmin and are subject to change without notice.

  • Page 38: Gtr/Gnc Unit Insertion And Removal

    This would be an acceptable place to insert the VSWR. Any problem with the antenna installation is most likely seen as high reflected power. A VSWR of 3:1 may result in up to a 50% loss in transmit power. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 4-6...

  • Page 39: Connector Pinout Information

    LIGHTING LO 1 RESERVED RESERVED RESERVED COM MIC 2 KEY* COM REMOTE TRANSFER* COM REMOTE TUNE UP* COM REMOTE TUNE DOWN* AIRCRAFT POWER RS-232 GND LIGHTING LO 2 RESERVED 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 5-1...
  • Page 40 AIRCRAFT POWER An asterisk (*) following a signal name denotes that the signal is an Active-Low, requiring a ground to activate. If there is no asterisk, the signal is an Active-High. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 5-2...

  • Page 41: P2002 Connector - Nav Board

    VOR/ILS ARINC 429 OUT A VOR OBI CLOCK VOR OBI SYNC VOR OBI DATA VLOC REMOTE TRANSFER ILS ENERGIZE SPARE SPARE GLIDESLOPE +FLAG PAR DME 1 MHZ-D/SERIAL DME ON GLIDESLOPE +UP RESERVED RESERVED 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 5-3...
  • Page 42 AIRCRAFT GND RESERVED AIRCRAFT POWER AIRCRAFT POWER GLIDESLOPE - FLAG PAR DME 100 KHZ-E GLIDESLOPE +DOWN PAR DME 1MHZ-E RESERVED GLIDESLOPE COMPOSITE OUT RESERVED AIRCRAFT GND AIRCRAFT GND AIRCRAFT GND GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 5-4 Rev. B...

  • Page 43: Power, Lighting, And Antennas

    AIRCRAFT POWER P2002 AIRCRAFT POWER P2002 AIRCRAFT GROUND P2001 AIRCRAFT GROUND P2001 AIRCRAFT GROUND P2001 AIRCRAFT GROUND P2002 AIRCRAFT GROUND P2002 AIRCRAFT GROUND P2002 AIRCRAFT GROUND P2002 AIRCRAFT GROUND P2002 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 5-5...

  • Page 44: Lighting Bus

     Waypoint position (latitude and longitude) and magnetic variation NOTE Aviation RS-232 data may be transmitted with or without the current GPS altitude in feet. Refer to Appendix B. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 5-6 Rev. B...
  • Page 45 Set COM Volume Level and Audio Control Parameters  Set COM channel spacing  Set NAV audio mode (GNC ONLY)  Set Omni-Bearing Select (OBS) value (GNC ONLY)  Set NAV Volume Level (GNC ONLY) 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 5-7...
  • Page 46 COM AUDIO is the summation of the COM receiver audio, COM sidetone audio, and intercom audio. Pin Name Connector 500 Ω COM AUDIO HI P2001 500 Ω COM AUDIO LO P2001 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 5-8 Rev. B...

  • Page 47: Com Discrete Inputs

    COM selections only. The pilot may exit this independent mode—restoring COM selection control to the front panel knobs and keys—by again depressing the switch for two seconds. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 5-9...

  • Page 48: Vor/Ils Audio

    VOR/LOC REMOTE TRANSFER* discrete input may be used to flip-flop between the active and standby NAV frequencies. A momentary low on this pin will load the standby NAV frequency into the active NAV frequency field. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 5-10...

  • Page 49: Vor/Ils Indicator

    +225 ±75 mVDC. When indicating FROM, output is -225 ±75 mVDC. When invalid information is present (Flag IN VIEW) the TO/FROM output is 0 ±10 mVDC. Pin Name Connector VOR/LOC +TO P2002 VOR/LOC +FROM P2002 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 5-11...
  • Page 50 The driver output voltage is not more than 1.0 V when sinking 20 mA. The maximum off state leakage current with respect to GND is less than 10 A. Pin Name Connector ILS ENERGIZE P2002 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 5-12 Rev. B...

  • Page 51: Rmi/Obi

    The maximum off state leakage current with respect to ground is less than 10 A. Pin Name Connector VOR OBI CLOCK P2002 VOR OBI SYNC P2002 VOR OBI DATA P2002 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 5-13...

  • Page 52: Dme Tuning

    PAR DME 50KHZ P2002 PAR DME 1MHZ-A P2002 PAR DME 1MHZ-B P2002 PAR DME 1MHZ-C P2002 PAR DME 1MHZ-D/SERIAL DME ON P2002 PAR DME 1MHZ-E P2002 DME COMMON P2002 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 5-14 Rev. B...
  • Page 53 SERIAL DME - DATA P2002 SERIAL DME - CLOCK P2002 SERIAL DME - RNAV/CH REQ P2002 SERIAL DME - RNAV MODE P2002 DME COMMON P2002 SERIAL DME - DME REQUEST P2002 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 5-15...
  • Page 54 This page intentionally left blank GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 5-16 Rev. B...

  • Page 55: Post Installation Configuration And Checkout Procedures

    If it is noticed that the lighting level on the GTR/GNC does not increase as the lighting bus input is increased in brightness, verify that the wiring is correct before proceeding. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 6-1...

  • Page 56: Connector Engagement Check

    ENT key and apply power to the GTR/GNC by turning the COM volume knob clockwise. Release the ENT key when the display activates and ‘Garmin’ appears on the screen. The first page displayed is the Config Mode page. While in configuration mode, pages can be selected by turning the outer knob to select the high-level page, turning the inner knob to select the subpage, and then pressing the ENT key to select the desired page.

  • Page 57: Sys Configuration

    The GNC can display DST data from a DME or GPS device. Select “GPS, DME” to give priority to DST data from a connected GPS receiver or “DME, GPS” to give priority to DST data from a connected DME receiver. Figure 6-3. DST Display Page 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 6-3...

  • Page 58: Figure 6-4. Intercom Enable Page

    This will set the minimum brightness of the bezel keys or display. The display minimum brightness level has a range from 1 to 100. The default level is 1. The bezel key minimum brightness level has a range from 0 to 100. The default level is 1. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 6-4...

  • Page 59: Table 6-4. Photocell Page Parameter Description

    0 (zero) to 100, and is set to 50 as a default value. This may also be used to match lighting curves with other equipment in the panel. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 6-5...

  • Page 60: Figure 6-7. Lighting Bus Page

    The Display Information page (Figure 6-8) allows the installer to view and verify the display software version, part number, serial number, minimum software level, hardware version, boot version, part number and minimum boot version of the unit. Figure 6-8. Display Information Pages GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 6-6 Rev. B...

  • Page 61: Nav Configuration (Gnc Only)

    Refer to Section 6.8 for instructions on how to load software to the GTR/GNC. NOTE Garmin recommends the use of a USB 2.0 compatible USB flash drive for updating databases and software on the GTR/GNC. Figure 6-9. Display Update Page 6.4.2...

  • Page 62: Figure 6-11. Arinc 429 Page

    TX: Generates all 429 outputs with SDI = 2 For use with serial Electronic Flight Instruments (EFIS) conforming to the SERIAL Garmin Serial Data Specification. See Appendix B 6.4.2.3 DME Configuration (GNC Only) Select the DME configuration page to configure the DME channel mode settings.

  • Page 63: Com Configuration

    Figure 6-12. NAV Information Page 6.4.2.5 NAV Update NOTE Garmin recommends the use of a USB 2.0 compatible USB flash drive for updating databases and software on the GTR/GNC.   Figure 6-13. NAV Software Update Page Refer to Section 6.8 for instructions on loading software to the GTR/GNC.

  • Page 64: Figure 6-15. Com Rx Squelch Page

    P/N, FPGA version, and FPGA P/N. Figure 6-16. COM Information Page 6.4.3.4 COM Update NOTE Garmin recommends the use of a USB 2.0 compatible USB flash drive for updating databases and software on the GTR/GNC.   Figure 6-17. COM Software Update Page Refer to Section 6.8 for instructions on loading COM software to the GTR/GNC.

  • Page 65: Audio Configuration

    GTR/GNC. If a music audio source is connected to P2001-3 and 19, it may be desirable to enable the Hi-Fidelity audio. Use the smaller inner knob to select On or Off. Press ENT when the appropriate selection is displayed. Figure 6-20. Hi-Fidelity Audio Page 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 6-11...

  • Page 66: Log Functions

    6.4.5.1 Download Log NOTE Garmin recommends the use of a USB 2.0 compatible USB flash drive for updating databases and software on the GTR/GNC. The Download Log page (Figure 6-21) is where the GTR/GNC keeps an error log to aid in diagnostics and troubleshooting.

  • Page 67: Ground Checks (Configuration Mode)

    7. Verify that the OBS decoded properly from 0 to 360 degrees. If the GNC will not accept the calibration, there may be a problem with the resolver interface. Verify wiring and contact Garmin for assistance if necessary. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev.

  • Page 68: Flags Check (Gnc Only)

    (Max Left, Full Left, Centered, Full Right, Max Right). 3. On the VDI selection, verify correct operation of the vertical deviations on the indicator by using the corresponding selections (Max Up, Full Up, Centered, Full Down, Max Down). GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 6-14...

  • Page 69: Lighting Bus Interface Check

    2. Slowly vary the lighting bus level that is connected to the GTR/GNC. Verify that the display brightness tracks the lighting bus setting. Continue to maximum brightness and verify proper operation. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 6-15...

  • Page 70: Ground Checks (Normal Mode)

    4. Ensure the Morse code identifier is being received over the crew headsets. 5. If the audio is not heard, verify the wiring connections to the audio panel. 6. Ensure the audio volume is sufficient for all anticipated cockpit noise conditions. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 6-16...

  • Page 71: Vhf Com

    1. Operate the connected serial remote tune source and the GTR/GNC in normal mode. 2. Ensure that the remote source is able to display data from the GTR/GNC. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 6-17...

  • Page 72: Interface Checkout

    (2) the frequency of a DME ground tester. 3. Verify that the DME locks on to the signal and a valid distance is displayed. 4. Tune an invalid VOR station. Verify that the DME data is flagged. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 6-18...

  • Page 73: Flight Checks

    3. Verify the Morse code decoder IDs the station (95% probability). 4. Fly the approach. 5. Verify NAV flag, GS flag, and CDI and VDI are operational. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 6-19...

  • Page 74: Software Loading

    5. After the card has been created, select finish to complete the process. 6. Remove the USB drive from the slot. The GTR/GNC USB loader drive is now ready to use. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 6-20...

  • Page 75: Loading Software To The Gtr/Gnc

    3. Verify that the available GTR/GNC software updates are being displayed. 4. Press the ENT key to begin the software update. When the updates are finished, the GTR/GNC will display the updates. 5. Verify the software updates loaded successfully. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 6-21...

  • Page 76: Load Database

    Figure 6-28. Verify Database Version Documentation Checks 6.9.1 Airplane Flight Manual Supplement Ensure that the Airplane Flight Manual Supplement (AFMS) is inserted in the Airplane Flight Manual (AFM) or Pilot’s Operating Handbook (POH). GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 6-22 Rev. B...

  • Page 77: Periodic Maintenance

    The front bezel, keypad, and display can be cleaned with a microfiber cloth or with a soft cotton cloth dampened with clean water. DO NOT use any chemical cleaning agents. Care should be taken to avoid scratching the surface of the display. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page 7-1...
  • Page 78 This page intentionally left blank GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page 7-2 Rev. A...

  • Page 79: Appendix Aenvironmental Qualification Form

    For RTCA/DO-160F Environmental Qualification Forms (EQFs) visit the Dealer Resource Center Garmin’s web site. The EQF part number for the GTR Series (GTR 225/225A/225B) is 005-00658-02. The EQF part number for the GNC Series (GNC 255A/255B) is 005-00658-03. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev.
  • Page 80 This page intentionally left blank GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page A-2 Rev. A...

  • Page 81: Appendix Bgtr/Gnc Data Format

    Table B-1 describes the Type 1 output sentence item designator (id) and item data (dddd) fields. If data for these sentences is invalid or unavailable, dashes ("-") are used to fill in all non-blank character positions. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page B-1...

  • Page 82: Table B-1. Aviation Output Sentence Format

    * The altitude is not output if the RS-232 port is configured as “Aviation Output 2.” * The line feed character is not output if the RS-232 port is configured as “Aviation Output 2.” GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page B-2 Rev.
  • Page 83 - sequence number (1 binary byte; last waypoint flag is set; route sequence number is 1) - ASCII carriage return character (0D hex) - ASCII line feed character (0A hex) 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page B-3...

  • Page 84: Table B-2. Type 2 Aviation Output Sentence Format

    - undefined hhhhhhh - hundredths of latitude minutes (unsigned binary) Two's complement binary in 16ths of degrees. mvar Easterly variation is positive. MSB output first. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page B-4 Rev. B...

  • Page 85: Nmea Data Format

    Encoded hex: each character consists of 4 bits of data placed in the low order nibble +30h. For example, the 8-bit value 5Fh would be encoded as two characters with values of 35h and 3Fh, which map to the ASCII characters “5” and “?”, respectively. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page B-5...
  • Page 86 COM Audio Volume. 03 = Request COM software version. 13 = Request GTR Status. d ......Message sub-id; set to (ASCII) 1 for Request COM Audio Volume, 0 otherwise. “00”......Reserved. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page B-6 Rev. B...
  • Page 87 8.33 KHz frequency is requested when the GTR/GNC is in 25 KHz channel spacing mode. Note: The GTR/GNC will ignore this message while transmitting on the active COM frequency. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page B-7...
  • Page 88 ......Data type: (ASCII) 1 = headphone, 4 = sidetone level, 9 = RF squelch vv ......Volume level: 00-FFh; two encoded hex characters (30h-3Fh). Example message: $PGRMC0211=<chksm><CR><LF> Set the speaker output volume to 1Dh out of FFh (“=“ = 3Dh, -30h = Dh). GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page B-8 Rev. B...
  • Page 89 000 to 950KHz in 50KHz steps, or the even numbers from 30h to 56h. “0” ......Reserved, data in this field will be ignored. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page B-9...
  • Page 90 The KHz portion converts ASCII ‘P’ to 50h, -30h yields 20h, x 25KHz steps = 800KHz. Note: The GNC will check input frequencies for validity. An RS-232 serial error message output will be generated if the frequency is invalid. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page B-10...
  • Page 91 “43”......Message ident. vv ......Volume level: 00-FFh; two encoded hex characters (30h-3Fh). Example message: $PGRMV431=<chksm><CR><LF> Set the NAV volume to 1Dh out of FFh (“=“ = 3Dh, -30h = Dh). 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page B-11...
  • Page 92 8.33 KHz mode. Note: This message is output at a nominal one second rate, or faster whenever the transceiver function or status changes. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page B-12 Rev. B...
  • Page 93 ......COM TX Power Limited; (ASCII) 0 = OK, 1 = Transmit power limited. h ......COM locked out; (ASCII) 0 = OK, 1 = Active frequency locked at 121.500 MHz. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page B-13...
  • Page 94 (ASCII) 0 = OK, 1 = stuck. Example message: $PGRMV4100010<chksm><CR><LF> GNC is running and ready to accept serial input, and glide slope guidance is unavailable. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page B-14 Rev. B...
  • Page 95 This situation will occur whenever the receiver determines that it is within the “cone of confusion” directly over a VOR, or when no signal is being received. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page B-15...
  • Page 96 If the decoded identifier is less than five characters in length, then the trailing characters will be filled in with spaces. Identifiers are restricted to using ASCII character 0-9 and A-Z. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page B-16...
  • Page 97 50KHz boundaries (i.e. 108.00, 108.05, 108.10, etc.). mk ......Standby NAV frequency: m = MHz, where m + 30h = desired MHz frequency in the range of 108 to 117MHz. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page B-17...
  • Page 98 “V” ......Message class. This is a GNC NAV message. 40 ......Message ident. vv ......Volume level: 00-FFh; use encoded hex (30h-3Fh). Example message: $PGRMV4030<chksm><CR><LF> The headphone volume level is 30h out of FFh. GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page B-18 Rev. B...

  • Page 99: Table B-3. Input Message Summary

    / Low Comm Software Version Upon request Length is in bytes and includes the “$” start of message character and the <CR><LF> end of message Notes sequence. 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page B-19...
  • Page 100 This page intentionally left blank GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page B-20 Rev. B...

  • Page 101: Appendix Cmechanical Drawings

    □ Figure C-3. GNC Center of Gravity □ Figure C-4. GTR Center of Gravity □ Figure C-5. GTR/GNC Rear Connector Layout Detail □ Figure C-6. Panel Cutout Detail □ Figure C-7. GTR Mounting Rack 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page C-1...
  • Page 102 This page intentionally left blank GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page C-2 Rev. A...
  • Page 103 Figure C-1. GTR/GNC Dimensions 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page C-3...
  • Page 104 Figure C-2. GTR/GNC Mounting Rack GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page C-4 Rev. B...
  • Page 105 6,'( 2) %(=(/  723 2) %(=(/   2876,'( 2) ,167$// 75$< 127(6  ',0(16,216 $5( ,1 ,1&+(6  ',0(16,216 $5( )25 5()(5(1&( 21/< Figure C-3. GNC Center of Gravity 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page C-5...
  • Page 106 6,'( 2) %(=(/  723 2) %(=(/   2876,'( 2) ,167$// 75$< 127(6  ',0(16,216 $5( ,1 ,1&+(6  ',0(16,216 $5( )25 5()(5(1&( 21/< Figure C-4. GTR Center of Gravity GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page C-6 Rev. B...
  • Page 107 Figure C-5. GTR/GNC Rear Connector Layout Detail 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page C-7...
  • Page 108 Figure C-6. Panel Cutout Detail GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page C-8 Rev. B...
  • Page 109 DURING INSTALLATION OF THE MOUNTING RACK, ENSURE EDGE OF THE TAB (BOTTOM FLANGE OF THE RACK) IS FLUSH WITH THE FACE OF THE INSTURMENT PANEL. Figure C-7. GTR Mounting Rack 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page C-9...
  • Page 110 This page intentionally left blank GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page C-10 Rev. B...

  • Page 111: Appendix Dinterconnect Diagrams

    □ Figure D-13. GNC - King Serial DME - Panel Mount Interconnect □ Figure D-14. GTR/GNC - GDU 620 Interconnect □ Figure D-15. GTR/GNC - GTN and GNS 400W/500W 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-1...
  • Page 112 This page intentionally left blank GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-2 Rev. A...
  • Page 113 Figure D-1. GTR/GNC System Interface Diagram 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-3...

  • Page 114: Figure D-2. Gtr/Gnc Typical Installation

    Figure D-2. GTR/GNC Typical Installation Sheet 1 of 2 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-4 Rev. B...
  • Page 115 Figure D-2. GTR/GNC Typical Installation Sheet 2 of 2 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-5...

  • Page 116: Figure D-3. Gtr/Gnc Power Lighting Configuration Interconnect

    Figure D-3. GTR/GNC Power Lighting Configuration Interconnect GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-6 Rev. B...

  • Page 117: Figure D-4. Gtr/Gnc - Antennas Interconnect

    Figure D-4. GTR/GNC - Antennas Interconnect Sheet 1 of 4 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-7...
  • Page 118 Figure D-4. GTR/GNC - Antennas Interconnect Sheet 2 of 4 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-8 Rev. B...
  • Page 119 Figure D-4. GTR/GNC - Antennas Interconnect Sheet 3 of 4 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-9...
  • Page 120 Figure D-4. GTR/GNC - Antennas Interconnect Sheet 4 of 4 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-10 Rev. B...

  • Page 121: Figure D-5. Gtr/Gnc - Audio Panel Interconnect

    Figure D-5. GTR/GNC - Audio Panel Interconnect Sheet 1 of 2 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-11...
  • Page 122 Figure D-5. GTR/GNC - Audio Panel Interconnect Sheet 2 of 2 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-12 Rev. B...

  • Page 123: Figure D-6. Gtr/Gnc - Mic Interconnect

    Figure D-6. GTR/GNC - MIC Interconnect 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-13...

  • Page 124: Figure D-7. Gtr/Gnc - Vor/Ils Interconnect

    Figure D-7. GTR/GNC - VOR/ILS Interconnect Sheet 1 of 2 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-14 Rev. B...
  • Page 125 Figure D-7. GTR/GNC - VOR/ILS Interconnect Sheet 2 of 2 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-15...

  • Page 126: Figure D-8. Gtr/Gnc Switches Interconnect

    Figure D-8. GTR/GNC Switches Interconnect GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-16 Rev. B...

  • Page 127: Figure D-9. Rmi Obi Interconnect

    Figure D-9. RMI OBI Interconnect 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-17...

  • Page 128: Figure D-10. Gnc - King Serial Dme - Remote Mount Interconnect

    Figure D-10. GNC - King Serial DME - Remote Mount Interconnect Sheet 1 of 2 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-18 Rev. B...
  • Page 129 Figure D-10. King Serial DME - Remote Mount Interconnect Sheet 2 of 2 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-19...

  • Page 130: Figure D-11. Parallel 2 Of 5 Dme Tuning Interconnect

    This page intentionally left blank Figure D-11. Parallel 2 of 5 DME Tuning Interconnect Sheet 1 of 2 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-20 Rev. A...
  • Page 131 Figure D-11. Parallel 2 of 5 DME Tuning Interconnect Sheet 2 of 2 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-21...

  • Page 132: Figure D-12. Parallel Slip Code Dme Tuning Interconnect

    Figure D-12. Parallel Slip Code DME Tuning Interconnect GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-22 Rev. B...
  • Page 133 Figure D-13. GNC - King Serial DME - Panel Mount Interconnect Sheet 1 of 2 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-23...
  • Page 134 Figure D-13. GNC - King Serial DME - Panel Mount Interconnect Sheet 2 of 2 GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-24 Rev. B...
  • Page 135 Figure D-14. GTR/GNC - GDU 620 Interconnect 190-01182-02 GTR 225/GNC 255 TSO Installation Manual Rev. B Page D-25...
  • Page 136 Figure D-15. GTR/GNC - GTN and GNS 400W/500W GTR 225/GNC 255 TSO Installation Manual 190-01182-02 Page D-26 Rev. B...

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