GTX 327

Mode AIC

TransPonder pilot's guide

@ 2000 GARMIN Corporation

GARMIN Intemational, Inc.

1200 East 15l$ Street, Olathe, Kansas 66062, U.S.A.

Iel.

913/397 .8200 or 800/B00.1020

Fax913/397.8282

GARMIN (Europe) Ltd.

Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO5l gAQ, U.K.

Tel.4411794.519914

Fax 44/1794.519272

GARMIN (Asia) Corporation

No. 63,Jangshu

2"d Road, Shijr, Taipei County, Taiwan

1e1.88612.2642.8999

Fax88612.2642.9099

Website Address: www.garmin.com

All rights reserved. Except as expressly provided herein, no parr of rhis manual may be reproduced, copied, transmitted, disseminated, downloaded or stored in any storage medium, for any purpose without prior written consent of GARMIN Corporation. GARMIN Corporation hereby grants permission to download a single copy of this manual onto a hard drive or other electronic s¿orage medium to be viewed for personal use, prorided rhar such electronic or printed copy of this manual contains the complete text of this coplright notice and provided further that any unauthorized commercial distribution of rhis manual is strictly prohibited.

Information in this manual is subject to change without norice. GARMIN Corporation reserves the right to change or improve its products and ro make changes in rhe content without obligation to notify any person or organization ofsuch changes.

\'isi¡ rhe GARMIN website

(www.garmin.com) for current updates and supplemental informarion conceming the use and ope¡ation of this and other GARMIN producrs.

GARMIN is a registered trademarks of GARMIN Corporation and ma1' nor be used without the express permission of GARMIN Corporation.

limited

Warranty

GARMIN Corporation wanants this product to be free from defects in materials and workmanship for one year from the date of purchase. GARMIN will, at its sole option, repair or replace any components which faii in normal use. Such repairs or replacement will be made at no charç to the customer for parts or labor. The customer is, however, responsible for any transponation costs. This wananty does not cover failures due ¡o abuse, misuse, accident or unauthorized alteration or repairs.

THE WARRANTIES AND REMED]ES CONTAINED HEREIN ARE EXCLUSIVE AND IN

LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED, INCLUDING ANY

LIABILITY ARISING UNDER WARRANTY OF MERCHANTABILITY OR FìTNESS FOR A

PARTICUTAR PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU

SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM

STATE

TO STATE.

IN NO EVENT SHALL GARMIN BE LLABLE FOR ANry INCIDENTAL,

SPECLAL, INDI-

RECT OR CONSEQUENTIAL DAMAGES, WHETHER RESUTTING FROM THE USE,

MISUSE OR INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT.

soME STATES

DO NOT ALLOW THE EXCLUSTONS OF INCIDENTAL OR CONSEQUEN-

TIAL DAMAGES, SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU.

To obrain wananty service, call the GARMIN Customer Service department (913/397.8200) for a retumed merchandise tracking number. The unit should be securely packaged with the tracking number clearly marked on the outside of the package, and sent freight prepaid and insured to a GARMIN wananty service station. A copy of the original sales receipt is required as the proof of purchase for warranty re^pairs. 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.

NOTE: The GTX 327 owner accepts all responsibility for obtaining the proper licensing before using the transponder

NOTE: The coverage you can expectfrom the GTX 327 is limited to

"line of

sight".

Low altitude or aircraft antenna shielding by the aircraft ißelf may result in reduced range. Range can be improved by climbing to a higher altitude.

lt

may be possible to minimize antenna shielding by locating the antenna where dead spoß are on ly noticed during abnormal flight attitu des.

CAUTION: The GTX 327 should be turned off before starting or shutting down aircraft engine(s).

Februarv 2000 Part Number 190-00187-00

Rev.

A Printed in USA

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The GTX327 trarsponder is poweredonby pressíngthe SÍBY, ALT or ON heys, orby a remote avionics mlster switch

(if applicable).

AJter power on a start-up page wíll be dîsplayed whíle the unit p er orms a s ef test.

Mode Selection

Keys

OFF-

Powers off the GTX 327.

STBY-

Powers on the tmnsponder in standby mode.

At power on the last active identification code will be selected. When in standby mode, the transponder will not reply to any interrogations.

ON-

Powers on the rransponder in Mode

A.

At power on the last active identification code will be selecred. In this mode, the transponder replies to intenogations, as indicated by the Reply Symbol

(E).

Replies do not include altitude information.

ALT-Powers

on the transponder in Mode A and Mode C. At power on the last active identification code will be selected. In ALI mode, the transponder replies to identification and altitude interrogations, æ indicated by the Reply Symbol

(Þ.

Replies to altitude intenogations include the standard pressure altitude received from an external altitude source, which is not adjusted for barometric pressure. The

ALT mode may be used in aircraft not equipped with the optional altitude encoder; however, the reply signal will not include altitude information.

GTX 327

Configuration Mode

The GTX 327's configuration, which is normally done at time o[ installation, influences many of the unit's functions described in this manual. If you wish to view or change any of the

GTX327 configuration parameters, you may access the GTX 327 Configuration Mode. Use caution when changing configuration. When in doubt, contact your authorized GARMIN

Aviation Service Center. The

Conþration

Mode should not be used while the aircraft is airbome.

To use

the

GT)/.327

Configuration

Mode:

1.

Press and hold the FUNC key while powering on the unit using the STBY, 0N, or AIT key

(or using an avionics master switch).

2.

Press the FUNC key to sequence through the configuration pages.

3.

Use the CRSR key to highlight selectable fields on each page.

4.

When a field is highlighted, enter numeric data using the 0 - 9 keyl and select items from a list using the 8 or 9 keys.

5.

Press the CRSR key to confirm list selections.

)

,l

Code

Selection

ooEoo

E@o

Code selection is done with eight keys

(0

-

7) that provide 4,096 active identification codes. Pushing one of these keys begins the code selection sequence. The new code will not be activated until the fourth digit is entered. Pressing the CLR key will move the cursor back to the previous digit. Præsing the CLR key when the cursor is on the first digit of the code, or pressing the CRSR key during code entry will remove the cursor and cancel dau entry restoring the previous code. The numbers 8 and 9 are not used for code entry only for entering a Count Down time, and in the Configuration Mode.

lmportant

Codes:

l20G-The

VFR code for any altitude in the US (Refer to ICAO standards elsewhere)

7000-

The VFR code commonly used in Europe (Refer to ICAO standards)

7500-

Hrjack code

(Aircraft is subject to unlawful interference)

7600-

Loss of communications

7700-

Emerçncy

7777-Military

interceptor operations (Never squawk this code)

0000-Military

use

(Not enterable)

Care should be taken not to select the code 7500 and all codes in the7600-7777 range, which rrigger special indicators in automated facilities. Only the code 7500 will be decoded as the hijack code. An aircraftb transponder code

(when available) is utilized to enhance the tracking capabilities of the ATC facilit¡ therefore care should be taken when making routine code changes.

Kevs

for

Other

GTX 327

Functions

IDENT:-

Presing the IDENT key activates the Special Position Identification

(SPI) Pulse for 18 seconds, identifying your transponder return from others on the air traffic controller's screen. The word'IDENT'will appear in the upper left comer of the display while the IDENT mode is active.

VFR-

Ses the transponder code to the pre-programmed VFR code selected in

Configuration Mode (this is set to 1200 at the factory). Pressing the VFR key again will restore the previous identification code.

ffi ffi

FUNC-

Changes the page shown on the right side of rhe display. Displayed data includes Pressure Altitude, Flight Time, Count Up timer, Count

Down timer, and may include Contrast and Dispìay Brightness, depending on configuration (as shown in the screens below):

PRESSURE ALT: Displays the altitude data supplied to the GfX 327 in feet, hundreds of feet (i.e., flight level), or meters, depending on configuration.

FLIGHT TIME: Displays the Flight Time, which is controlled by the

START/STOP key or by a squat switch as configured during installation.

With squat switch control, the timer begins when lift off is sensed and pauses when landing is sensed.

COLJNT UP

TIMEk

Controlled by STARTiSTOP and CLR keys.

ffi ffi t

E

COUNT DO\ryN TIMER: Controlled by STARI/STOP, CLR, and CRSR keys. The initial Count Down time is entered with the 0

-

9 keys.

CONTRASI This page is only dispìayed if manualcontrast mode is selected in Configuration Mode. Contrast is controlled by the 8 and 9 keys

.

DISPLIÍ

This page is only displayed if manual backlighting mode is selected in Configuration Mode. Backlighting is controlled by the

I and 9 keys.

@

@ r

@

E

STARUSTOP- Starts and stops the Count Up and Count Down timers.

CRSR-

lnitiates entry of the starting time for the Count Down timer and cancels transponder code entry.

CLR-

Resets the Count Up and Count Down timers and cancels the previous keypress during code selection.

8-

Reduces Contrast and Display Brightness when the respective pages are displayed. Also enters the number eight into the Count Down timer.

9-

Increases Contrast. and Display Brightness when the respective pages are displayed. Also enters the number nine into the Count Down timer.

Altitude

Trend

lndicator

When the

'PRESSURE ALT' page is displal,ed, an anow may be displayed to the right of the altirude, indicating that the altitude is increasing or decreasing. Of of two sizes of anows may be displayed depending on the rate of climb/descent. The sensitirity o[ these arrows is set using the GTX327 Configuration Mode.

Timer Operation

To

operate the

Flight Timer:

1

.

Press the FUNC key until 'FLIGHT TIME' is displayed.

2. lf the GTX 327 is configured as having a squat switch installed, the timer will begin counting automatically when the squat switch senses that the aircraft has become airborne.

3.

lf desired, you may press START/STOP to pause or restart the timer.

4.

Press CLR to reset the t¡mer to zero.

5.

lf the GTX 327 is configured as having a squat switch ¡nstalled, the timerwill pause automatically when the squat switch senses that the aircraft has touched down.

To operate

the

Count Up

timer:

1.

Press the FUNC key until 'COUNT UP' is displayed.

2. lf necessary press CIR to reset the Count Up timer to zero.

3.

Press START/STOP to count 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 to count down.

4.

Press START/STOP again to pause the timer.

5.

When the Count Down timer expirel the words'COUNT DOWN' are replaced with

'EXPIRED', and the time begins counting up and flashing.

6.

Press CLR to reset the timer to the initial time value.

Automatic

ALT/STBY

Mode Switching

If rhe GTX 327 is configured for automatic standby switching, the mode will automatically change to ALI when a squat switch senses that the aircraft has become airborne. Also, the mode will change to STBY automatically when a squat switch senses that the aircraft has touched down. Additionall¡ a delay time can be set in the Configuration Mode, causing the

GTX327 to wait a specified length of time after landing before automatically changing to STBY mode.