90-01122-00 TBD 2011 Rev.
©Copyright 2011 Garmin International, Inc., or its subsidiaries All Rights Reserved Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without the express prior written consent of Garmin.
DOCUMENT PAGINATION Section Table of Contents Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Section 7 Appendix A Appendix B Appendix C Appendix D Page B Rev.
INFORMATION SUBJECT TO EXPORT CONTROL LAWS This document may contain information which is subject to the Export Administration Regulations ("EAR") issued by the United States Department of Commerce (15 CFR, Chapter VII, Subchapter C) and which may not be exported, released, or disclosed to foreign nationals inside or outside of the United States without first obtaining an export license.
1 GENERAL DESCRIPTION .............................................................................................................. 1-1 1.1 Introduction ................................................................................................................................ 1-1 1.2 Equipment Description .............................................................................................................. 1-1 1.3 Technical Specifications .................................................
5 CONNECTOR PINOUT INFORMATION ....................................................................................... 5-1 5.1 Pin Function List ........................................................................................................................ 5-1 5.1.1 5.2 P881 Connector .................................................................................................................. 5-1 Power and Antennas...........................................................................
GDL 88 MOD LEVEL HISTORY The following table identifies hardware modification (Mod) Levels for the GDL 88, GDL 88D, GDL 88 with GPS/SBAS and GDL 88D with GPS/SBAS. Mod Levels are listed with the associated service bulletin number, service bulletin date, and the purpose of the modification. The table is current at the time of publication of this manual (see date on front cover) and is subject to change without notice.
1 GENERAL DESCRIPTION 1.1 Introduction This manual is applicable for GDL 88 units with software version 2.00 or later. This manual describes the physical, mechanical, and electrical characteristics, as well as instructions and other conditions and limitations for installation and approval of the GDL units. Refer to Section 2, Limitations, for additional information and other considerations.
1.3 Technical Specifications 1.3.1 Physical Characteristics Table 1-2. Physical Characteristics – GDL 88 Units Characteristics Specifications Height Width Depth (Installed with rack and connectors) GDL 88 Weight (Unit only) GDL 88 Weight (Installed with rack) GDL 88 with GPS/SBAS Weight (Installed with rack) GDL 88D Weight (Unit only) GDL 88D Weight (Installed with rack) GDL 88D with GPS/SBAS Weight (Unit Only) GDL 88D with GPS/SBAS Weight (Installed with rack) 1.3.2 General Specifications Table 1-3.
1.3.3 GPS/SBAS Specifications Table 1-4. GPS/SBAS Specifications – GDL 88 and GDL 88D with GPS/SBAS Characteristics Number Of Channels Frequency Sensitivity (Acquisition, No Interference) Sensitivity (Drop Lock) Dynamic Range Lat/Lon Position Accuracy Velocity TTFF (Time To First Fix) Reacquisition Position Update Interval 1 PPS (Pulse Per Second) Datum SATCOM Compatibility Antenna Power Supply Specifications 15 (12 GPS and 3 SBAS) 1575.42 MHz L1, C/A code -134.5 dBm GPS -135.
1.3.5 1030 MHz Transmitter Specifications Table 1-6. Transmitter Specifications Characteristics Frequency Transmit Power Frequency Tolerance Specifications 1030 MHz -29 dBm + 20 kHz 1.3.6 1090 MHz Receiver Specifications Table 1-7. Receiver Specifications Characteristics Frequency Frequency Tolerance Modulation Data Rate Sensitivity Page 1-4 Rev.
1.3.7 UAT/1090 Requirements The GDL 88 requires UHF antenna(s) meeting the following specifications: Vertically polarized The VSWR produced by the antenna does not exceed 1.7:1 at 978 MHz and 1.5:1 at 1090 MHz. TSO-C66, TSO-C74, or TSO-C112 antennas that also meet the VSWR specification. NOTE Certain types of transponder antennas that utilize very thin radiator elements are only intended for use at 1030 and 1090 MHz.
1.4 License Requirements The Telecommunications Act of 1996, effective February 8, 1996, provides the FCC discretion to eliminate radio station license requirements for aircraft and ships. The GTN 750 installations must comply with current transmitter licensing requirements. In the US, to find out the specific details on whether a particular installation is exempt from licensing, please visit the FCC web site http://wireless.fcc.gov/aviation.
1.5 Regulatory Compliance 1.5.1 TSO Authorization and Advisory Circular References The conditions and tests required for TSO approval of this article are minimum performance standards. It is the responsibility of those installing this article either on or within a specific type or class of aircraft to determine that the aircraft installation conditions are within the TSO standards. TSO articles must have separate approval for installation in an aircraft.
1.5.2 Non-TSO Functions Table 1-10. Non-TSO Functions Function Transponder Self Interrogations: The GDL 88 has the ability to transmit a low power Mode A all call interrogation on the 1030 MHz frequency for the purposes of receiving the squawk code and IDENT status from a nearby Mode A, A/C, or S transponder on the 1090 MHz frequency. Applicable SW P/N Applicable CLD P/Ns Table 1-11. System Functions DO-178B Level System Function NOTE All GDL 88 unit functions are design approved under the TSO.
1.5.3 TSO Deviations Table 1-12. TSO Deviations TSO Deviation TSO-C145c TSO-C154c TSO-C157 TSO-166b TSO-C195 1.5.4 FCC Grant of Equipment Authorization Table 1-13. FCC and IC IDs Model GDL 88 GDL 88 TSO Installation Manual 190-01122-00 FCC ID IPH-01246 IC ID 1312A-01246 Page 1-9 Rev.
1.
2 LIMITATIONS 2.1 Installation The conditions and tests required for TSO approval of this article are minimum performance standards. It is the responsibility of those installing this article either on or within a specific type or class of aircraft to determine that the aircraft installation conditions are within the TSO standards. TSO articles must have separate approval for installation in an aircraft.
3 INSTALLATION OVERVIEW Always follow acceptable avionics installation practices per AC 43.13-1B, AC 43.13-2B, or later FAA approved revisions of these documents. The GPS/SBAS installation instructions have been prepared to meet the guidance material contained in AC 20-138A “Airworthiness Approval of Global Navigation Satellite System (GNSS) Equipment.
3b. The GPS antenna should be mounted no closer than two feet from any antennas emitting more than 25 watts of power. An aircraft EMC check can verify the degradation of GPS in the presence of interference signals. 3c. To achieve the best possible low-elevation antenna gain (by minimizing pattern degradation due to shadowing and near-field interaction), the GPS antenna must be mounted with clearance from other antennas, including passive antennas such as another GPS antenna or XM antenna.
Figure 3-1. GPS Antenna Installation Considerations Page 3-4 Rev.
4 INSTALLATION PROCEDURES 4.1 Unit and Accessories For description of units, see Table 1-1. Table 4-1. Catalog Part Numbers Model GDL 88 GDL 88 with GPS/SBAS GDL 88D GDL 88D with GPS/SBAS Unit Only Kit 010-00859-00 010-00860-00 010-00861-00 010-00862-00 Standard Kit 010-00859-30 010-00860-30 010-00861-30 010-00862-30 Unit P/N 011-02369-00 011-02370-00 011-02371-00 011-02372-00 Table 4-2.
4.2 Optional Accessories 4.2.1 GPS Antenna Options For details regarding antenna selection, refer to Section 1.3.8. Once the antenna type is decided upon, refer to the information below for detailed parts information for antennas available directly from Garmin. Contact the manufacturer directly for information on other antennas.
4.2.2 UAT Antenna Options 4.3 Miscellaneous Options Item Connector, BNC, Male, Clamp GPS 1.57542 GHz Notch Filter Connector, TNC, Male, Clamp Garmin P/N 330-00087-00 330-00067-00 N/A Mfg P/N N/A N/A 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 4.4 Installation Materials not Supplied 4.4.
4.6 Coaxial Cable Installation Follow the steps below for installation of the coaxial cables: 1. Route the coaxial cable to the radio rack location keeping in mind the recommendations of Section 3.1. Secure the cable in accordance with AC 43.13-1B Chapter 11, section 11. 2. Trim the coaxial cable to the desired length and install the TNC and BNC connectors per the cabling instructions on Figure 4-1 below.
Table 4-4. Socket Contact Part Numbers Wire Gauge Configuration Module 78-pin Connector (P1001) P1001-P1005 Garmin P/N Military P/N AMP Positronic ITT Cannon 28 AWG [1] 336-00021-00 N/A N/A N/A N/A 22-28 AWG [2] 336-00021-00 M39029/58-360 204370-2 MC8522D 010-2042-000 [1] For configuration module pins, ensure that the crimp tool is set to crimp 28 AWG wire (indenter setting of „4‟). [2] Contacts listed are not to be used for configuration module wiring.
4.7 Equipment Mounting 4.7.1 Unit Replacement 4.8 Antenna Installation and Connections This section provides information on the antenna cable installation. Refer to 3.1 herein for installation location considerations. SUGGESTION: Temporarily locate the GPS/SBAS antenna with coax connected to the GTN unit and check the GPS/SBAS performance as described in Section. Once a suitable location has been verified, then permanently mount the antenna.
5 CONNECTOR PINOUT INFORMATION 5.1 Pin Function List 5.1.1 P881 Connector View looking at rear of unit, Pin X is top X 20 19 39 59 18 38 58 78 57 77 17 16 37 36 56 76 15 35 55 75 14 34 54 74 13 33 53 73 11 32 52 72 31 51 71 10 30 50 70 9 29 49 69 8 28 48 68 7 6 27 26 47 67 46 66 5 25 45 65 4 24 44 64 43 63 2 3 23 22 42 62 1 21 41 61 40 60 Table 5-1.
Pin 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 P881 Connector Cont’d Pin Name SPARE* RS-232 GND 5 USB GROUND USB VBUS POWER RS-232 GND 4 RS-232 GND 3 RS-232 GND 2 RS-232 GND 1 ARINC 429 IN 2A ARINC 429 IN 1A ARINC 429 IN 3A FAN GROUND ETHERNET IN 1A ETHERNET IN 1B ETHERNET OUT 1A ETHERNET OUT 1B PRESSURE ALT BROADCAST ANNUN* RS-422 OUT 1A RS-422 IN 1A TEST MODE* SUPPRESSION USB DATA LO USB DATA HI CONFIG MODULE DATA CONFIG MODULE
5.2 Power and Antennas This section covers the power input requirements and antenna connections. See Appendix D for interconnect information. 5.2.1 Power Pin Name AIRCRAFT POWER AIRCRAFT POWER AIRCRAFT GND AIRCRAFT GND Connector P881 P881 P881 P881 Pin 19 20 77 78 I/O In In --- 5.2.2 Antennas Pin Name UAT ANTENNA – BOTTOM BNC UAT ANTENNA – TOP GPS/SBAS ANTENNA TNC Connector P882 P883 P884 I/O I/O I/O In UAT antenna(s) use BNC coaxial connectors on the connector backplate.
6 POST INSTALLATION CONFIGURATION AND CHECKOUT PROCEDURES Page 6-4 Rev.
GDL 88 TSO Installation Manual 190-01122-00 Page 6-5 Rev.
7 PERIODIC MAINTENANCE This section contains information on periodic calibration and maintenance required for continued airworthiness. 7.1 Equipment Calibration No scheduled servicing tasks or internal manual adjustments are required on the GDL 88 units. 7.2 Cleaning The GDL 88 units do not require regular cleaning. 7.3 Battery Replacement The GDL 88 with GPS/SBAS and the GDL 88D with GPS/SBAS includes an internal battery that will last about 10 years.
Page 7-2 Rev.
Appendix A ENVIRONMENTAL QUALIFICATION FORM For RTCA/DO-160F Environmental Qualification Forms (EQFs) visit the Dealers Only site on http://www.garmin.com. The GDL 88 units all use the same EQF, part number 005-00358-20. GDL 88 TSO Installation Manual 190-01122-00 Page A-1 Rev.
Appendix B GDL 88 DATA FORMAT B.1 GDL 88 RS-232 Fuel/Air Data Input Format B.1.1 Electrical Interface The input signals are compatible with RS-232C. Data input at 9600 baud (1200 baud for Apollo Altitude Encoder) with a word length of 8 bits, one stop bit, and no parity. One message is received per second. B.1.
B.1.4 Shadin Altitude Sentence The GDL 88 is capable of receiving the following 17-byte message from Shadin Altitude Encoders, Altitude Serializers, and Altitude Converters: RMS<+/->12345T<+/->12ul Where: RMS ASCII characters space (0x20) <+/-> sign indicator (0x2b["+"] or 0x2d["-"]) 12345 altitude in feet T ASCII character <+/-> sign indicator 12 sensor temperature ul checksum of bytes 1 through 14 in hex ASCII (i.e.
B.1.
Appendix C MECHANICAL DRAWINGS GDL 88 TSO Installation Manual 190-01122-00 Page C-5 Rev.
Appendix D INTERCONNECT DIAGRAMS Page D-6 Rev.
GDL 88 TSO Installation Manual 190-01122-00 Page D-7 Rev.
