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Garmin GTX 327 Transponder Manual

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Comments to date: 5. Page 1 of 1. Average Rating:
blfer 12:37am on Wednesday, October 13th, 2010 
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smorris12 1:00pm on Thursday, July 22nd, 2010 
Solid card for an old machine. Allowed me to use the Dell 4300, 1.7 GHz P4, 768 mb pc 100 ram as a bot machine for DAOC. Worked out of the box.
phsabater 7:02pm on Friday, July 16th, 2010 
GeForce 6200AVP 256MB Graphics card The card worked as advertised. The computer was now able to run the programs that I had purchased.

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GTX 327

Mode A/C Transponder

pilots guide

Copyright 1999 - 2008 GARMIN Ltd. 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. 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 print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited. This manual is written for software version 2.10, and is not suitable for earlier software versions. Information in this document is subject to change without notice. Visit the GARMIN web site ( for current updates and supplemental information concerning the operation of this and other GARMIN products.
Software License Agreement
BY USING THE GTX 327, YOU AGREE TO BE BOUND BY THE TERMS AND CONDITIONS OF THE FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS AGREEMENT CAREFULLY. GARMIN grants you a limited license to use the software embedded in this device (the Software) in binary executable form in the normal operation of the product. Title, ownership rights and intellectual property rights in and to the Software remain in GARMIN. You acknowledge that the Software is the property of GARMIN and is protected under the United States of America copyright laws and international copyright treaties. You further acknowledge that the structure, organization and code of the Software are valuable trade secrets of GARMIN and that the Software in source code form remains a valuable trade secret of GARMIN. You agree not to decompile, disassemble, modify, reverse assemble, reverse engineer or reduce to human readable form the Software or any part thereof or create any derivative works based on the Software. You agree not to export or re-export the Software to any country in violation of the export control laws of the United States of America.
CAUTION: The GTX 327 should be turned off before starting or shutting down aircraft engine(s).
NOTE: Contact a Garmin authorized dealer for software updates.

April 2008

Part Number 190-00187-00 Rev. D

Printed in USA

Limited Warranty
This GARMIN product is warranted to be free from defects in materials or workmanship for one year from the date of purchase. Within this period, GARMIN will at its sole option, repair or replace any components that fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts or labor, provided that the customer shall be responsible for any transportation cost. This warranty does not cover failures due to abuse, misuse, accident or unauthorized alteration or repairs. THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED OR STATUTORY, INCLUDING ANY LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE. IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE, OR INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do not allow the exclusion of incidental or consequential damages, so the above limitations may not apply to you. GARMIN retains the exclusive right to repair or replace the unit or software or offer a full refund of the purchase price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY. To obtain warranty service, contact your local Garmin Authorized Service Center. For assistance in locating a Service Center near you, call Garmin Customer Service at one of the numbers shown below. Garmin International, Inc. Garmin (Europe) Ltd. 1200 East 151st Street Liberty House, Bulls Copse Road Olathe, Kansas 66062, U.S.A. Hounsdown Business Park Phone: 913/397.8200 Southampton, SO40 9RB, U.K. FAX: 913/397.8282 Phone: +44/0870.8501241 FAX: +44/0870.8501251

NOTE: It is the responsibility of the GTX 327 owner to obtain proper licensing before using the transponder. NOTE: The coverage expected from the GTX 327 is limited to line of sight. Low altitude or aircraft antenna shielding by the aircraft itself may result in reduced range. Range can be improved by climbing to a higher altitude. It may be possible to minimize antenna shielding by locating the antenna where dead spots are only noticed during abnormal flight attitudes.
The GTX 327 transponder is powered on by pressing the STBY, ALT, or ON keys, or by a remote avionics master switch (if applicable). After power on, a start-up page is displayed while the unit performs a self test. If the unit detects an internal failure, the screen displays SELF TEST FAILED.

Mode Selection Keys

OFF Powers off the GTX 327. Pressing STBY, ON, or ALT key powers on the transponder displaying the last active identification code. STBY Selects the standby mode. When in standby mode, the transponder will not reply to any interrogations. ON Selects Mode A. In this mode, the transponder replies to interrogations, as indicated by the Reply Symbol ( ). Replies do not include altitude information. ALT Selects Mode A and Mode C. In ALT mode, the transponder replies to identification and altitude interrogations as indicated by the Reply Symbol ( ). Replies to altitude interrogations include the standard pressure altitude received from an external altitude source, which is not adjusted for barometric pressure. The ALT mode may be selected in aircraft not equipped with an optional altitude encoder; however, the reply signal will not include altitude information. Any time the function ON or ALT is selected the transponder becomes an active part of the Air Traffic Control Radar Beacon System (ATCRBS). The transponder also responds to interrogations from TCAS equipped aircraft.

Code Selection

Code selection is done with eight keys (0 7) providing 4,096 active identification codes. Pushing one of these keys begins the code selection sequence. Digits that are not yet entered appear as dashes. The new code is activated when the fourth digit is entered. Pressing the CLR key moves the cursor back to the previous digit. Pressing the CLR key when the cursor is on the first digit of the code, or pressing the CRSR key during code entry, removes the cursor and cancels data entry, restoring the previous code. The CLR key may be pressed up to five seconds after code entry is complete to return the cursor to the fourth digit. The numbers 8 and 9 are not used for code entry, only for entering a Count Down time and for adjusting contrast and display brightness.

Keys for Other GTX 327 Functions
IDENT Pressing the IDENT key activates the Special Position Identification (SPI) Pulse for 18 seconds, identifying your transponder return from others on the air traffic controllers screen. The word IDENT will appear in the upper left corner of the display during this time. VFR Sets the transponder code to the pre-programmed VFR code selected during installation configuration (this is set to 1200 at the factory). Pressing the VFR key again restores the previous identification code. If the VFR key is pressed when disabled (dependent upon installation configuration) a VFR Key Disabled message appears, to indicate that no operation took place. FUNC Changes the page shown on the right side of the display. Display includes Pressure Altitude, Flight Time, Count Up, and Count Down timers. START/STOP Starts and stops the Count Up, Count Down, and Flight timers. CRSR Initiates starting time entry for the Count Down timer and cancels transponder code entry. CLR Resets the Count Up, Count Down, and Flight timers. Cancels the previous keypress during code selection and Count Down entry. Returns cursor to the fourth code digit within five seconds after entry. 8 Reduces Contrast and Display Brightness when the respective fields are displayed (dependent upon installation configuration) and enters the number eight into the Count Down timer. 9 Increases Contrast and Display Brightness when the respective fields are displayed (dependent upon installation configuration) and enters the number nine into the Count Down timer.

Function Display

NOTE: Transponder options are normally set at time of installation. For changes to the GTX327 parameters, contact your Garmin authorized service center.
PRESSURE ALT: Displays the altitude data supplied to the GTX 327 in feet, hundreds of feet (i.e., flight level), or meters, dependent upon installation configuration. FLIGHT TIME: Displays the Flight Time, configured during installation as MANUAL, CLEAR, or ACCUMULATE (see Timer Operation for details). Timer is controlled by the START/STOP and CLR keys when configured as Manual. COUNT UP TIMER: Controlled by START/STOP and CLR keys. COUNT DOWN TIMER: Controlled by START/STOP, CLR, and CRSR keys. The initial Count Down time is entered with the keys. CONTRAST: This page is only displayed if manual contrast mode is selected during installation configuration. Contrast is controlled by the 8 and 9 keys. DISPLAY: This page is only displayed if manual backlighting mode is selected.during installation configuration. Backlighting is controlled by the 8 and 9 keys.

Altitude Trend Indicator

When the PRESSURE ALT page is displayed, an arrow may be displayed to the right of the altitude, indicating that the altitude is increasing or decreasing. One of two sizes of arrows may be displayed depending on the vertical speed rate. The sensitivity of these arrows is set during transponder installation.
Automatic ALT/STBY Mode Switching
If the GTX 327 is configured with Automated Airborne Determination, ALT mode selection occurs when lift-off is sensed. When the aircraft is on the ground, the transponder automatically selects and displays STBY. The transponder does not respond to ATCRBS interrogations when STBY is annunciated. When a delay time is set (dependent upon installation configuration), the GTX 327 waits the specified length of time after landing before changing to STBY mode.

ADS-B Control (GDL 90)

Automatic Dependent Surveillance-Broadcast (ADS-B) technology improves situational awareness and flight safety. With ADS-B capabilities, position, velocity, and heading information are automatically transmitted to other aircraft and ground stations. The GTX327 provides mode control for the optional GDL90 Universal Access Transceiver (UAT) datalink. The GDL90 provides ADS-B capabilities.
Timer Operation To operate the Flight Timer:
1. Press the FUNC key until FLIGHT TIME is displayed. 2. If the GTX 327 Flight Timer is configured as ACCUMULATE or CLEAR, the timer will begin automatically when the unit senses that the aircraft has become airborne. The timer may be reset to zero at every liftoff (CLEAR), continue accumulating time at liftoff (ACCUMULATE), or may be controlled manually (MANUAL). 3. If desired, press START/STOP to pause or restart the timer. 4. Press CLR to reset the timer to zero. 5. If the timer is configured to start automatically it will pause when the Automated Airborne Determination senses that the aircraft is on the ground.
To operate the Count Up timer:
1. Press the FUNC key until COUNT UP is displayed. 2. If necessary, press CLR to reset the Count Up timer to zero. 3. Press START/STOP to begin counting up. 4. Press START/STOP again to pause the timer. 5. Press CLR to reset the timer to zero.

To operate the Count Down timer:
1. Press the FUNC key until COUNT DOWN is displayed. 2. Press CRSR and use the 0 - 9 keys to set the initial time. All digits must be entered (use the 0 key to enter leading zeros). 3. Press START/STOP begin to counting down. 4. Press START/STOP again to pause the timer. 5. When the Count Down timer expires, the COUNT DOWN banner is replaced with a flashing EXPIRED, and the time begins counting up. 6. Press CLR to reset the timer to the initial time value.
1999 - 2008 Garmin Ltd. or its subsidiaries Garmin International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, U.S.A. Garmin (Europe) Ltd. Liberty House, Bulls Copse Road, Hounsdown Business Park, Southampton, SO40 9RB, U.K. Garmin Corporation No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan Part Number 190-00187-00 Rev. D



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