Section 914
GARMIN GTX 327 Transponder
Page Date: 15. December 2005
914 - 3
Pilot´s Operating Handbook
EXTRA 300L
914.1
GENERAL
The GARMIN GTX 327 is a panel-mounted TSO.d transponder with the addition of timing functions.
The transponder is a radio transmitter and receiver that operates on radar frequencies, receiving
ground radar interrogations at 1030 MHz and transmitting a coded response of pulses to ground-
based radar on a frequency of 1090 MHz.
N O T E
The GTX 327 owner accepts all responsibility for obtaining the proper license before using
the transponder.
The coverage you can expect 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.
N O T I C E
Damage possible due to current peaks.
The GTX 327 should be turned off before starting or shutting down aircraft engine.
The GTX 327 Transponder is powered on by pressing the
STBY
,
ALT
or
ON
keys, or by the
AVIONIC
MASTER
switch. After power on a start-up page will be displayed while the unit performs a self test.
914.1.1
MODE SELECTION KEYS
OFF
Powers off the GTX 327.
STBY
Powers on the transponder 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 transponder in Mode A. At power on the last active identification code will be
selected. In this mode the transponder replies to interrogations, as indicated by the Reply Symbol.
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 ALT mode, the transponder replies to identification and altitude interrogations,
as indicated by the Reply Symbol. Replies to altitude interrogations include standard pressure
altitude received from a separate encoder.
Page Date: 20. January 2016
Summary of Contents for 300L
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