Garmin G1000 Transponder

TM

G1000

Transponder Pilot’s Guide

Record of Revisions

Revision Date of Revision Revision Page Range Description

A
B
C
D

04/30/04
11/29/04

05/3/05

07/20/05

5-1 – 5-7
5-1 – 5-7
5-1 – 5-5
5-1 – 5-5

Initial release.
Added information on flight ID reporting.
Changes per Software 4.02.
New cover plus minor edits.

Garmin G1000 Transponder Pilot’s Guide 190-00382-00 Rev. D

TRANSPONDER DESCRIPTION

5.1 GTX 33 TRANSPONDER

The GTX 33 transponder is integrated into the
G1000 system, offering Mode A, Mode C and Mode S
interrogation and reply capabilities. This pilot’s guide
provides a description of the transponder operation and
information on Mode S capability.

The transponder controls are located on the G1000
Primary Flight Display (PFD) on the lower portion of the
screen (see figures below).

TRANSPONDER SOFTKEYS

The transponder function spans three levels of
softkeys; the Top-level, the Mode Selection and the Code
Selection softkeys.

When the Top-level
following softkeys appear in the softkey bar (Figure 5.1.2):

STBY, ON, ALT, VFR, CODE, IDENT, BACK.

XPDR softkey is pressed, the

When the CODE softkey is pressed, the number

softkeys appear in the softkey bar (Figure 5.1.3):

0, 1, 2, 3, 4, 5, 6, 7, IDENT, BKSP, BACK. The digits
8 and 9 are not used for code entry. Pressing the BKSP

softkey backs up code selection to the previous digit.

Pressing the

BACK softkey during code selection
reverts to the MODE Selection softkeys (Figure 5.1.2).
Pressing the BACK softkey during Mode Selection reverts
to the Top-level softkeys (Figure 5.1.1).

NOTE: After 45 seconds of transponder softkey
inactivity, the system reverts back to the Top-level
softkeys (Figure 5.1.1).

TRANSPONDER STATUS BAR

The Transponder Status bar is located to the left of the
System Time box and contains, a four-digit code field, a
mode field and a reply status indicator. In Standby mode,
both the code field and the mode field appear in white. In
all other modes, these fields appear in green.

Figure 5.1.1 Top-level Softkeys

Figure 5.1.2 Mode Selection Softkeys

Figure 5.1.3 Code Selection Softkeys

Garmin G1000 Transponder Pilot’s Guide190-00382-00 Rev. D

Pressing XPDR
displays the Mode
Selection softkeys

Pressing

CODE
displays the Code
Selection softkeys

Transponder Status Bar

Pressing BACK
displays the Top­level softkeys

Pressing

BACK
displays the Mode
Selection softkeys

5-1

TRANSPONDER DESCRIPTION

MODE S FEATURES

The GTX 33 transponder is equipped with selective
addressing or Mode Select (Mode S), capability. Mode S
functions include the following features:

• Level-2 reply data link capability (used to
exchange information between aircraft and
various ATC facilities)

• Surveillance identifier capability

• Flight ID reporting

• Altitude reporting

• Airborne status determination

• Transponder capability reporting

• Mode S Enhanced Surveillance (EHS)
requirements

• Acquisition squitter

Flight ID Reporting – The G1000 transponder reports
aircraft identification as either the aircraft registration or a
FLT ID (Flight Identification). The system is configured
for either option by an authorized Garmin service center.

If configured for Flight ID entry, the pilot must enter
the appropriate flight ID on the PFD. After the correct
Flight ID is entered, the aircraft identification reported in
response to ATC radar interrogations is properly correlated
with the associated call sign for voice communication.

The flight ID is not to exceed seven (7) characters. No
space is needed when entering Flight ID. When a Flight
ID contains a space, the system automatically removes it
upon completion of Flight ID entry. (See ICAO documents
8168, 4444 and 8585 for further details).

Acquisition Squitter – Acquisition squitter, or short
squitter, is the transponder 24-bit identification address.
The transmission is sent periodically, regardless of the
presence of interrogations.

The purpose of acquisition squitter is to enable Mode S
ground stations and Traffic Collision Avoidance System
(TCAS) equipped aircraft to recognize the presence of
Mode S-equipped aircraft for selective interrogation.

TRAFFIC INFORMATION SERVICE (TIS)

Mode S provides a data link for Traffic Information
Service (TIS). TIS is a ground-based service that sends
out location, direction, altitude and climb/descent
information relative to all transponder-equipped aircraft
within a radius of 55 miles from select sites.

For aircraft not equipped with TCAS or TAS, TIS
provides a graphic display of traffic information. TIS
displays up to eight (8) traffic targets within 7.5 nautical
miles from 3,000 feet below to 3,500 feet above your
aircraft. TIS data is updated approximately once every
five (5) seconds.

NOTE: TIS is intended only to assist in
visual acquisition of other aircraft in Visual
Meteorological Conditions (VMC).

NOTE: Aircraft without an operating transponder
are invisible to TIS.

If the Flight ID is set to ‘SAME AS TAIL’ no entry is
required. In this configuration, the transponder then
reports the aircraft registration number to ATC.

Garmin G1000 Transponder Pilot’s Guide 190-00382-00 Rev. D5-2

OPERATION

5.2 OPERATION

MODE SELECTION

Mode selection can be automatic (Ground and Altitude
modes) or manual (Standby, ON and Altitude modes).
The STBY, ON and ALT softkeys can be accessed by
pressing the XPDR softkey.

Ground Mode (Automatic)

Ground mode is automatically selected when the
aircraft is on the ground. A green GND indication
appears in the mode field of the Transponder Status bar.
In Ground mode, the transponder does not allow Mode
A and Mode C replies, but it does permit acquisition
squitter and replies to discretely addressed Mode S
interrogations.

Figure 5.2.1 Ground Mode

Standby Mode (Manual)

The Standby mode can be selected at any time by
pressing the STBY softkey. In Standby mode, the
transponder does not reply to interrogations, but new
codes can be entered. If the Standby mode is selected,
a white STBY indication appears in the mode field of the
Transponder Status bar.

Figure 5.2.2 Standby Mode

NOTE: In Standby mode, the IDENT function is

inhibited.

Manual ON Mode

The ON mode can be selected at any time by pressing
the ON softkey. ON mode generates Mode A and Mode S
replies, but Mode C altitude reporting is inhibited. In ON
mode, a green ON indication appears in the mode field of
the Transponder Status bar.

NOTE: Ground mode can be overridden
by pressing any one of the Mode Selection
softkeys.

Garmin G1000 Transponder Pilot’s Guide190-00382-00 Rev. D

Figure 5.2.3 ON Mode

5-3

OPERATION

Altitude Mode (Automatic or Manual)

Altitude mode is automatically selected when the
aircraft becomes airborne. Altitude mode may also be
selected manually by pressing the ALT softkey.

If Altitude mode is selected, a green ALT indication is
displayed in the mode field of the Transponder Status bar,
and all transponder replies requesting altitude information
are provided with pressure altitude information.

Figure 5.2.4 Altitude Mode

Reply Status

When the transponder sends replies to interrogations,
an R indication appears momentarily in the reply status
field of the Transponder Status bar.

CODE SELECTION

Entering a Code

A total of 4,096 discrete identification codes can be

selected with the Code Selection softkeys.

To enter a transponder code:

XPDR

1. Press the
Mode Selection softkeys.

2. Press the
transponder Code Selection softkeys, for digit
entry.

3. Press the digit softkeys to enter the code in the
code field. When entering the code, the next
key in sequence must be pressed within 10
seconds, or the entry is cancelled and restored
to the previous code. Five seconds after the
fourth digit has been entered, the transponder
code becomes active.

softkey to display the transponder

CODE

softkey to display the

5-4

Figure 5.2.5 Reply Indication

Garmin G1000 Transponder Pilot’s Guide 190-00382-00 Rev. D

Figure 5.2.6 Entering a Code

NOTE: When entering a code, press the BKSP

(backspace) softkey to back up and change code
digits.

OPERATION

VFR Code

The VFR code can be entered either manually, each
digit at a time, or by pressing the XPDR softkey, then the
VFR softkey. When the VFR softkey is pressed, the pre-
programmed VFR code is automatically displayed in the
code field of the Transponder Status bar.

VFR

Pressing the

softkey again restores the previous

identification code.

NOTE: The pre-programmed VFR code is set at
the factory to 1200.

Important Codes

Following is a list of important codes:

• 1200 – VFR code in the U.S. (refer to ICAO
standards for VFR codes in other countries).

• 7000 – VFR code commonly used in Europe (refer
to ICAO standards).

• 7500 – Hijack code.

• 7600 – Loss of communication code.

• 7700 – Emergency code.

• 7777 – Military interceptor operations code
(NEVER SQUAWK THIS CODE).

• 0000 – Code for military use in the U.S.

IDENT FUNCTION

Pressing the IDENT softkey sends an ID indication to
Air Traffic Control (ATC). The ID return distinguishes your
transponder from all others on the air traffic controller’s
radar screen.

The IDENT softkey appears in all levels of transponder
softkeys. When the IDENT softkey is pressed, a green
IDENT indication is displayed in the mode field of the
Transponder Status bar for a duration of 18 seconds.

Figure 5.2.7 IDENT Indication

When the
or Code Selection, the system reverts to the Top-level
softkeys.

IDENT

softkey is pressed while in Mode

NOTE: In Standby mode, the IDENT softkey is
inoperative.

Garmin G1000 Transponder Pilot’s Guide190-00382-00 Rev. D

5-5

Garmin International, Inc.
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Shijr, Taipei County, Taiwan
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190-00382-00 Rev. D © 2005 Garmin Ltd. or its subsidiaries