Garmin 03253, 0225612 User Manual

GTX 335/345

All-In-One ADS-B Transponder

Pilot's Guide

© 2016-2018 Garmin Ltd. or its subsidiaries. All rights reserved.

This manual reflects the operation of GTX 3X5 transponders.

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Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks
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For information about the Aviation

Visit flyGarmin.com

for aviation product support.

Limited Warranty refer to Garmin’s website.

Printed in the U.S.A
August 2018 190-01499-00 Rev. E

Copyright Information

WARNING

WARNING

WARNING

WARNING

WARNING

WARNING

CAUTION

WARNINGS/CAUTIONS/NOTES

Do not use data link weather information for maneuvering in, near, or around areas of
hazardous weather. Information contained within data link weather products may
not accurately depict current weather conditions.

Do not use the indicated data link weather product age to determine the age of the
weather information shown by the data link weather product. Due to time delays
inherent in gathering and processing weather data for data link transmission, the
weather information shown by the data link weather product may be significantly older
than the indicated weather product age.

This product, its packaging, and its components contain chemicals known to the
State of California to cause cancer, birth defects, or reproductive harm. This
notice is being provided in accordance with California’s Proposition 65. If you have
any questions or would like additional information, please refer to our website at
www.garmin.com/prop65/.

WARNINGS \ CAUTIONS \ NOTES

To reduce the risk of unsafe operation, carefully review and understand all aspects of
the GTX 3X5 Pilot’s Guide. Thoroughly practice basic operation prior to actual use.

The display surface is coated with a special anti-reflective coating that is very
sensitive to skin oils, waxes, and abrasive cleaners. It is very important to clean the
lens using an eyeglass lens cleaner that is specified as safe for anti-reflective
coatings with a clean, lint-free cloth.

Traffic information is provided as an aid in visually acquiring traffic. Pilots must
maneuver the aircraft based only upon ATC guidance or positive visual acquisition
of traffic.

Unauthorized repairs or modifications could result in permanent damage to the
equipment, and void your warranty and your authority to operate this device under
FCC and FAA regulations.

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide i

WARNINGS/CAUTIONS/NOTES

NOTE

NOTE

NOTE

The coverage expected for all operations (transponder replies to ATC, ADS-B and FIS-B
reception) from the Garmin GTX 3X5 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.

This product does not contain any user-serviceable parts. Repairs should only be
made by an authorized Garmin service center.

WARNINGS \ CAUTIONS \ NOTES

It is the responsibility of the GTX 3X5 owner, residing outside of the U.S., to obtain
proper licensing before using the transponder.

ii GTX 335/345 Pilot’s Guide 190-01499-00 Rev. E

PRODUCT REGISTRATION AND SUPPORT

Copyright Information

Product Registration and Support

Help us better support you by completing your online registration. To register, have your
product’s serial number on hand. Visit www.Garmin.com and click the Product
Registration link on the home page. Be sure to record your serial number in the space
provided below.

PRODUCT REGISTRATION AND SUPPORT

Serial Number

This guide is available electronically at: www.garmin.com/manuals

If you have any questions, visit flyGarmin.com

:

Record of Revisions

Part Number Revision Date Description

190-01499-00 A

B

C

D

E

02/12/16

08/12/16

09/09/16

07/11/18

08/02/18

Initial release.

Added rotorcraft information.

Minor edits.

Added FIS-B information.

Minor edits.

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide iii

SOURCES AND REFERENCES

INTRODUCTION

Abbreviations and Acronyms

ADS-B

ADS-R

AHRS

ATC

ATCRBS

BLE

FIS-B

ABBREVIATIONS AND ACRONYMS

PED

PIREP

SSR

TAS

TCAS

TFRs

TIS

TIS-B

Automatic Dependant Surveillance-Broadcast

Automatic Dependent Surveillance-Rebroadcast

Attitude and Heading Reference System

Air Traffic Control

Air Traffic Control Radar Beacon System

Bluetooth Low Energy

Flight Information Services-Broadcast

Portable Electronic Device

Pilot Report

Secondary Surveillance RADAR

Traffic Advisory System

Traffic Collision Avoidance System

Temporary Flight Restrictions

Traffic Information Service

Traffic Information Service-Broadcast

Sources and References

Automatic Dependent Surveillance–Broadcast (ADS-B) is an important part of the FAA's
NextGEN effort. ADS-B is a precise GPS-based surveillance system that provides ATC
access to traffic data well beyond the capabilities of RADAR alone. It enables the display of
precise traffic data in cockpits equipped to receive ADS-B.

For more information about ADS-B, visit the Garmin ADS-B Academy website.
www.garmin.com/us/intheair/ads-b/

For more information about ADS-B and other NextGEN programs, visit the FAA NextGEN
website. www.faa.gov/nextgen/

iv GTX 335/345 Pilot’s Guide 190-01499-00 Rev. E

Copyright Information

1 GTX 3X5 Series Transponders ....................................................................................... 1-1

1.1 GTX 335 Transponder ................................................................................................... 1-1

1.2 GTX 345 Transponder ................................................................................................... 1-1

2 GTX 3X5 Controls ........................................................................................................... 2-1

2.1 Panel Mount Transponder Controls ............................................................................... 2-1

2.2 Mode Selection Keys ..................................................................................................... 2-1

2.3 Squawk Code Keys ....................................................................................................... 2-3

2.4 Function Keys ................................................................................................................ 2-4

2.5 Remote Transponder Control ........................................................................................ 2-4

3 Display Functions and Settings ..................................................................................... 3-1

3.1 Transponder (XPDR) ...................................................................................................... 3-1

3.2 Timers (TMR) ................................................................................................................. 3-2

3.3 Altitude (ALT) ................................................................................................................ 3-3

3.4 System (SYS) ................................................................................................................. 3-4

3.4.1 Bluetooth Pairing Instructions ............................................................................... 3-5

3.4.2 Bluetooth Paired Device Information ..................................................................... 3-5

4 ADS-B IN Traffic (GTX 345 Only) .................................................................................... 4-1

4.1 Traffic Alerting .............................................................................................................. 4-2

4.2 Helicopter Traffic Alerting ............................................................................................. 4-2

4.2.1 On Scene Mode .................................................................................................... 4-2

4.2.2 No Source of Heading Data .................................................................................. 4-3

4.3 TCAD/TAS/TCAS I GTX 345 Integration ......................................................................... 4-3

5 FIS-B Weather and Flight Information .......................................................................... 5-1

6 Connext Bluetooth ......................................................................................................... 6-1

7 Troubleshooting ............................................................................................................. 7-1

7.1 Transponder Failures ..................................................................................................... 7-1

7.2 Transponder System Messages ...................................................................................... 7-2

List of Figures

Figure 2-1 Squawk Code Entry Field ..................................................................................... 2-3

Figure 3-1 Flight ID Edit Display Page .................................................................................... 3-1

Figure 3-2 Flight ID Editable Display Page ............................................................................. 3-1

Figure 3-3 Bluetooth Page ..................................................................................................... 3-5

Figure 3-4 Bluetooth Pair Request Page ................................................................................ 3-5

Figure 3-5 Paired Device List Page ......................................................................................... 3-5

Figure 3-6 Auto-reconnect Page ........................................................................................... 3-5

Figure 3-7 Unpair Device? Page ............................................................................................ 3-6

Figure 3-8 (Selected) Bluetooth Device Name Page ............................................................... 3-6

Figure 7-1 ADS-B 1090 Failed Screen .................................................................................... 7-1

Figure 7-2 ADS-B 1090 and Transponder Failed Screen ......................................................... 7-1

List of Tables

Table 2-1 Mode Section Key Functions ................................................................................ 2-2

Table 2-2 Squawk Code Key Functions ................................................................................ 2-3

Table 2-3 Squawk Codes ..................................................................................................... 2-3

Table 2-4 Function Keys ...................................................................................................... 2-4

Table 5-1 FIS-B Weather Products ........................................................................................ 5-2

Table 6-1 GTX 345 Connext Features .................................................................................. 6-1

Table 7-1 Troubleshooting .................................................................................................. 7-2

TABLE OF CONTENTS

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide v

COPYRIGHT INFORMATION

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vi GTX 335/345 Pilot’s Guide 190-01499-00 Rev. E

1 – GTX 3X5 SERIES XPDR

GTX 3X5 XPDR

1 GTX 3X5 SERIES TRANSPONDERS

The GTX 3X5 Series Transponders are panel mount and remote transponders. Both

models are TSO-C112e (Level 2ens, Class 1) compliant mode S transponders with
TSO-C166b compliant ADS-B Out 1090 MHz Extended Squitter functionality.

1.1 GTX 335 Transponder

GTX 335 Features:

• ADS-B Out

• TIS traffic display output and aural alerting

• Altitude deviation alerting

• Timers: count up, count down, flight, trip

• Static (Outside) air temperature display

• Density and pressure altitude display

• Internal GPS (Optional)

For more information on TIS traffic refer to the display’s operator’s manual and the FAA
Aeronautical Information Manual (AIM), 4-1-17.

1.2 GTX 345 Transponder

The GTX 345 includes ADS-B In functionality, when connected to a suitable display.
GTX 345 Features:

• ADS-B Out

• Dual-band ADS-B In traffic display output and aural alerting

• Integration with TCAD/TAS/TCAS I traffic systems

• FIS-B weather and flight information display output

• Bluetooth interface provides traffic, FIS-B, and other air data to a Portable Elec
Device (PED)

• Altitude deviation alerting

• Timers: count up, count down, flight, trip

• Static (Outside) air temperature display

• Density and pressure altitude display

• Internal GPS (Optional)

tronic

1 - GTX 3X5 SERIES XPDR

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1 – GTX 3X5 SERIES XPDR

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1-2 GTX 335/345 Pilot’s Guide 190-01499-00 Rev. E

1 – GTX 3X5 SERIES XPDR

NOTE

GTX 3X5 XPDR

2 GTX 3X5 CONTROLS

2.1 Panel Mount Transponder Controls

The GTX 3X5 series transponders have an auto-dimming display and keypad layout. The
keys access the transponder’s controls and features.

ON

Powers on, disables altitude reporting.

ALT

Powers on, enables altitude reporting.

VFR

Changes to the preprogrammed squawk code for VFR.

OFF

Powers off.

SBY

Powers on or changes into standby mode.

IDNT

Activates the Ident function.

2.2 Mode Selection Keys

2 - GTX 3X5 CONTROLS

The transponder system no longer supports a pilot selectable GND mode. The
transponder should always be in ALT mode prior to moving on the airport surface.
It must be in ALT mode when operating in certain controlled airspace, in
accordance with 14 CFR 91.215. For guidance on transponder operation, refer to
the FAA Aeronautical Information Manual (AIM), 4-1-20(a)(3).

When on the ground or in the air always operate the transponder in ALT mode, unless
otherwise requested by ATC. It is acceptable to go directly from OFF to ALT mode. It is not
necessary to place in SBY mode for a “warm up” period. The transponder automatically
determines whether the aircraft is in the air or on the ground and sends that information
to other aircraft and ATC.

Automatic ALT Mode Switching

If the unit is configured for Automated Airborne Determination and senses a transition
from on ground to in air, the unit automatically switches from SBY to ALT mode.

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide 2-1

◦

ON

ALT

2 - GTX 3X5 CONTROLS

VFR

IDENT

SBY

The ON key selects the on mode.

◦

The transponder replies to interrogations.Replies do not include pressure
altitude.

◦

The Reply ( ) symbol on the display indicates the transponder is
responding.

◦

The

ALT

key selects the alt mode.

◦

Always use Alt mode while
otherwise requested by ATC.

◦

All aircraft air/ground state transmissions are handled via the GTX 3X5
transponder and require no pilot action.

◦

The transponder replies to identification and altitude interrogations.

◦

The Reply ( ) symbol indicates the transponder is responding.

◦

The GTX 3X5 transmissions include pressure altitude.

◦

The

VFR

key sets the transponder code to the preprogrammed VFR
code.This is factory set to 1200, but.may be changed during installation
configuration.

◦

To restore the previous identification code, press the

◦

To toggle between these two codes, continue to press the

◦

The

IDENT

transponder apart from others on the air traffic controller’s screen.

◦

During this time the word “IDENT” will appear in the upper left corner of
the display.

◦

The

SBY

key selects the standby mode.

◦

The transponder will not reply to any interrogations or transmit ADS-B Out.

◦

If BT functions are enabled, BT functionality remains operational.

◦

The GTX 345 will continue to receive ADS-B In information, but will not be a
TIS-B participant.

Table 2-1 Mode Section Key Functions

in the air and on the ground

key activates the IDENT function for 18 seconds. This sets the

, unless

VFR

key a second time.

VFR

key.

2-2 GTX 335/345 Pilot’s Guide 190-01499-00 Rev. E

1 – GTX 3X5 SERIES XPDR

GTX 3X5 XPDR

2.3 Squawk Code Keys

There are eight squawk code entry keys (0 – 7). They provide access to all ATCRBS codes.
Pressing one of the squawk code entry keys begins the code selection sequence. Digits
that are not yet entered appear as underscored blanks. When the fourth digit is entered

the new code is activated.

Table 2-2 Squawk Code Key Functions

2 - GTX 3X5 CONTROLS

Press the

Press and hold the

Pressing the
the code entry, retaining the last code entered.

P

ressing the

entry. The last code entered is retained.

7600 Enter code if there is a loss of communication. “LOST COMM” displays

7700

CLR

key to move the cursor back to the previous digit.

CLR

key to move the cursor back to the

CLR

key when the cursor is on the first digit removes the cursor and cancels

CRSR

key when entering the code removes the cursor and cancels the code

Figure 2-1

Code Description

under the squawk field.

Enter code if there is a general emergency. “EMERGENCY” displays under
the squawk field.

Squawk Code Entry

Table 2-3 Squawk Codes

first digit

Field

.

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide 2-3

2.4 Function Keys

Table 2-4 Function Keys

FUNC

ENT

CRSR

2 - GTX 3X5 CONTROLS

CLR

8



9



The

FUNC

key cycles through four menu groups shown on the right-hand side

of the display. Menu groups include:

◦

Transponder (XPDR)

◦

Timers (TMR)

◦

Altitude (ALT)

◦

System (SYS)

The

ENT

key acknowledges the selection of menu items and pilot data entry

fields.

The

CRSR

key activates the cursor to select items in menus and on pages.

The

CLR

key clears selected entry and exits the menus.

The key enters the number eight in the Flight ID or Count Down timer.
It navigates up

The key enters the number nine in the Flight ID or Count Down timer.
It navigates down and between the functions and settings within a menu
group.

and between the functions and settings within a menu group.

2.5 Remote Transponder Control

The GTX 3X5 transponder functions are controllable from connected, Garmin certified
displays (e.g., GTN) or G1000 integrated flight deck. When the GTX 3X5 is installed in a
location other than the cockpit instrument panel, remote control from a display is the only
GTX 3X5 flight crew interface available.

Remote transponder control includes:

◦

Squawk code

◦

IDENT

◦

Transponder mode

◦

ADS-B transmit control*

◦

Flight ID*

*When allowed by installation configuration.

Refer to the display's pilot guide for transponder control operation that is specific to each
display.

2-4 GTX 335/345 Pilot’s Guide 190-01499-00 Rev. E

◦

TIS traffic enable/disable (GTX 335 only)

1 – GTX 3X5 SERIES XPDR

Press
FUNC

key

Press
FUNC

key

Press
FUNC

key

Press
FUNC

key

GTX 3X5 XPDR

3 DISPLAY FUNCTIONS AND SETTINGS

The GTX 3X5 is organized into four menu groups shown on the right-hand side of the
display. Each menu group contains a set of functions and settings. Menu groups include:

◦

Transponder (XPDR)

1. To navigate between the menu groups, press the

2. To navigate up or down and between the functions and settings within a current
menu group, press the

When enabled by installation configuration, the menu group last selected and the
functions last used within that menu group are saved and restored at system power on.
Otherwise, function navigation resets to the default state at system power on.

3.1

Transponder

◦

Timers (TMR)

8



(XPDR)

or

9

keys.

◦

Altitude (ALT)

FUNC

key.

◦

System (SYS)

3 - DISPLAY FUNCTIONS AND SETTINGS

FLIGHT ID – This page displays the active Flight ID. Unless configured, the
Flight ID is not editable. If configured, the Flight ID Edit prompt displays,

ENT

and

CLR

as shown in figure 3-1. To edit the Flight ID use the
For an example of the editable Flight ID page refer to

figure 3-2.

keys.

Figure 3-1 Flight ID Edit Display Page

Figure 3-2 Flight ID Editable Display Page

1090ES TX CTRL

– This page displays the current ON/OFF state of the
1090ES ADS-B Out function. Access to pilot control of the 1090ES
ADS-B Out function is through this page when allowed by system
configuration.

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide 3-1

3.2 Timers (TMR)

Press
FUNC

key

Press
FUNC

key

Press
FUNC

key

Press
FUNC

key

UP COUNTER – This page provides a stopwatch style counter. Manual
start/stop/reset controls are via the

ENT

and

CLR

keys.

DOWN COUNTER

– This page provides notification in a count down style

timer when the timer expires. Manual start/stop/set/reset controls are via

ENT

and

CLR

the

3 - DISPLAY FUNCTIONS AND SETTINGS

FLIGHT TIMER – This page provides an airborne flight timer that

automatically starts and stops with the GTX automatic airborne

keys.

determination. The timer measures the elapsed airborne time since the
last on ground-to-airborne transition. Manual start/stop/reset controls

ENT

and

CLR

are via the

keys.

TRIP TIMER – This page provides an airborne flight timer that
au tomatically starts and stops with the GTX automatic airborne
determination. The timer measures the elapsed airborne time since the
last manual reset of the timer. Manual start/stop/reset controls are via the

ENT

and

CLR

keys.

3-2 GTX 335/345 Pilot’s Guide 190-01499-00 Rev. E

3.3

Press
FUNC

key

Press
FUNC

key

Press
FUNC

key

Press
FUNC

key

Altitude

(ALT)

1 – GTX 3X5 SERIES XPDR

GTX 3X5 XPDR

3 - DISPLAY FUNCTIONS AND SETTINGS

PRESSURE ALT

– This page displays the current pressure altitude.

ALT MONITOR – This page displays the current altitude deviation from
the altitude chosen to maintain. When the altitude monitor is turned on it is
automatically set to the current altitude.

Example: If the monitor is turned on at 9,500 ft, the monitor will trip
when at 9,250 ft. or 9,750 ft., unless the installer configured the
deviation limit to something other than the default value of 250 ft.

If deviation is greater than the deviation limit (default is 250 ft.), the GTX
will display “LEAVING ALTITUDE” for two seconds. It will then switch to
the altitude monitor page. If the altitude alert is configured to
“Message” or “Message + Chime,” the GTX will aurally alert “leaving
altitude.” The GTX will reset the monitor when the aircraft’s altitude
returns within the deviation limit.

CRSR

and

ENT

ON/OFF controls are via the

keys.

SAT/DALT – This page displays the current static air temperature (SAT) and

density altitude (DALT), when available.

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide 3-3

3.4 System (SYS)

NOTE

Press

FUNC

key

Press

FUNC

key

Press

FUNC

key

Press

FUNC

key

BACKLIGHT –

This page displays the current backlight level and backlight level

offset. The backlight level offset is via the

CONTRAST –

This page displays the current contrast level and contrast level

offset. The contrast level offset is via the

3 - DISPLAY FUNCTIONS AND SETTINGS

Messages are not high priority. Their purpose is to provide additional
information on abnormal system behavior. They do not require immediate pilot
action. Any transponder failure will immediately display an alert with no pilot
action necessary to view the alert. For troubleshooting failure messages, refer
to section 7.

MESSAGES – This page displays the number of active system messages.
Viewing active system messages is via the

BLUETOOTH (GTX 345) –

This page displays the status of the GTX 345
Bluetooth function. This page will not display when the GTX 345 connects to
a GX000 or GTN over HSDB. The Bluetooth function is automatically placed
into pairing mode when this page is displayed. Pairing must be initiated by
the PED and then confirmed on the GTX 345. The last 13 paired PEDs and 6
Bluetooth Low Energy (BLE) devices are saved. At system power on, the GTX
345 automatically connects to any available and previously saved paired PEDs.
PEDs that are currently connected and paired are viewed/deleted via the

8 and

and

9

keys. For instructions on Bluetooth pairing refer to
section 3.4.1. For information on Connext Bluetooth features, refer to
section 6.

GPS STATUS –

This page displays the status of all configured GPS sources. The

GPS position fix details are viewed via

CRSR

and 8

CRSR

and 8

CRSR

CRSR

key selection.

and

9

and

9

key selection.

keys

keys.

.

CRSR

3-4 GTX 335/345 Pilot’s Guide 190-01499-00 Rev. E

1 – GTX 3X5 SERIES XPDR

GTX 3X5 XPDR

3.4.1 Bluetooth Pairing Instructions

For first time activation of Bluetooth devices:

1. Go to the GTX 345 Bluetooth page to enable pairing mode. Refer to figure 3-3. If
connected to a GTN or GX000 via HSDB, refer to the display’s pilot’s guide.

Enable Bluetooth on the PED.

2.

3. Select “GTX 345” from the list of available devices on the PED. Refer to
manufacturer’s information for pairing instructions.

4. When a PED sends a pairing request the Bluetooth Pair Request page will display
the device name and passkey. Refer to figure 3-4.

Press

ENT

5.

on the GTX 345 and accept the pairing request on PED.

Figure 3-3 Bluetooth Page

Figure 3-4 Bluetooth Pair Request Page

3.4.2 Bluetooth Paired Device Information

3 - DISPLAY FUNCTIONS AND SETTINGS

To view the paired device list:

CRSR

1. Press the

To view the menu and pairing status:

1. Press the

2. Then press the

The Paired Devices list page will display. Refer to figure 3-5.

More information about each paired device and applicable settings can be found by doing
the following steps:

To set the auto-reconnect status:

1. Highlight the paired device.

2. Then press

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide 3-5

key.

8 and

9

keys, respectively.

ENT

key.

Figure 3-5 Paired Device List Page

ENT

key. Refer to figure 3-6.

Figure 3-6 Auto-reconnect Page

To unpair a device:

1. Highlight the device to be unpaired.

ENT

2. Then press the

To view the device name on the Bluetooth page:

1. Press the

ENT

key. Refer to figure 3-7.

Figure 3-7 Unpair Device? Page

key.

2. Use the

3. Then press the

8 and

9

keys, highlight the device’s name to view.

ENT

key. Refer to figure 3-8.

Figure 3-8 (Selected) Bluetooth Device Name Page

3 - DISPLAY FUNCTIONS AND SETTINGS

3-6 GTX 335/345 Pilot’s Guide 190-01499-00 Rev. E

1 – GTX 3X5 SERIES XPDR

NOTE

NOTE

GTX 3X5 XPDR

4 ADS-B IN TRAFFIC (GTX 345 ONLY)

Inherent inaccuracies exist in TIS-B and TAS/TCAS traffic position data. Because
of this the GTX 345 may at times be unable to correlate targets from multiple
sources for the same aircraft. When this occurs, a single aircraft is tracked and
displayed as two co-located targets.

The GTX 345 will continue to receive ADS-B In information when in standby
mode.

The GTX has two modes:

1. Airborne Situational Awareness (AIRB). AIRB is in operation in the en route
environment, outside of five NM from, and 1,500 feet above, the nearest airport.

2. Surface Situation Awareness (SURF). SURF is in operation within the terminal
environment, within five NM and less than 1,500 feet above field elevation. When
SURF is running airport map data and ground targets may be displayed as an aid
to situational awareness.

4 - ADS-B IN TRAFFIC

ADS-B:

ADS-R:

TIS-B:

The GTX 345 receives ADS-B traffic data (ADS-B, ADS-R, TIS-B) through the UAT
(978 MHz) and the 1090 MHz receivers. The GTX 345 may also receive traffic data from
configured TAS/TCAS/TCAD. Traffic data is received, processed, and outputted to a
connected display without pilot interaction. Traffic data may also be displayed on a PED
(e.g., tablet) via the built-in Bluetooth interface or connected Flight Stream 110/210.

Data transmitted directly from other aircraft.

Ground station rebroadcast of ADS-B data after data link translation (UAT to
1090 MHz or 1090 MHz to UAT). This function aids aircrafts only
operating one frequency.
For more information about ADS-B refer to the FAA Aeronautical
Information Manual (AIM), 4-5-7.

Ground station broadcast of secondary surveillance radar (SSR) derived traffic.

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide 4-1

4.1 Traffic Alerting

To enhance situational awareness, the GTX 345 provides traffic alerting for ADS-B, ADS­R, and TIS-B targets. An aural message issues when an alert becomes active.

For example, “Traffic! Two O’clock, Low, Two Miles.”
Alerting parameters provide enough time after an alert is generated to acquire the target

and maneuver the aircraft away from the conflicting traffic. The alerting parameters
consider:

1. Closure rate of each aircraft (ownship and target)

2. Altitude separation and trend

3.

Speed

4. Angle

To minimize nuisance alerts, traffic alerting sensitivity is adaptive based on altitude above
ground level. In fixed winged aircraft no aural alerts are given below 500 feet.

4.2 Helicopter Traffic Alerting

4 - ADS-B IN TRAFFIC

A helicopter with a GTX 345 connected to a Garmin navigator or radar altimeter offers
additional traffic alerting for helicopter operations. Traffic alerting volumes are tailored to
minimize nuisance alerts when operating in an airport environment at less than 200 feet
AGL, and less than 60 knots groundspeed, while still providing alerts from airborne ADS-B
equipped aircraft.

When in the airport environment alerting envelope, aural traffic alerts are shortened to
“Traffic.” Bearing, distance, and relative altitude information is omitted. There are no
traffic alerts when groundspeed is less than 10 knots and within 50 feet of the ground.

4.2.1 On Scene Mode

On Scene Mode is pilot selectable. It changes traffic alerting volumes for other ADS-B
equipped rotorcraft traffic. This allows helicopters to operate in closer proximity to each
other without excessive nuisance alerts. The pilot must manually select the on and off
mode for On Scene Mode. For information about controls and indications refer to the
display’s pilot guide.

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GTX 3X5 XPDR

4.2.2 No Source of Heading Data

Due to helicopter maneuverability, ground track may not correspond to heading at low
speeds. Limitations apply to GTX 345 installations with no source of heading data
provided.

ADS-B traffic will not display when operating at less than 15 knots groundspeed. Aural
traffic alerts will issue, appropriately. If a TAS/TCAS is interfaced to the GTX 345 then:

• TAS/TCAS traffic targets will continuously display at all speeds.

• If in excess of 15 knots in backward or sideway flight, TAS/TCAS and ADS-B
targets may not correlate. Two targets may appear on the display for each
actual target being received over both ADS-B and TAS/TCAS.

4.3

TCAD/TAS/TCAS

To optimize situational awareness the GTX 345 correlates TCAD/TAS/TCAS with
ADS-B In traffic, combining data from all sources. This creates the most accurate and
comprehensive traffic picture. When a correlation is made the most relevant target is
displayed. There are no duplicates. Any active traffic system, or ADS-B traffic that is
correlated, will

When a GTX 3X5 and TAS/TCAS system integrate, the GTX 3X5 controls the operating
mode of the TAS/TCAS system. It does this by using both its own air/ground logic and the
available mode controls from the interfaced display. The GTX 345 provides all traffic aural
alerts.

also display.

I GTX 345 Integration

not

4 - ADS-B IN TRAFFIC

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5 FIS-B WEATHER AND FLIGHT INFORMATION

The GTX 345 Flight Information Services–Broadcast (FIS-B) function is capable of receiving
weather and flight information. FIS-B is a subscription-free service that is broadcast over
the UAT (978 MHz) data link. Reception of FIS-B data requires the aircraft to be within
range and line-of-sight of a ground station. Because terrain may obstruct the signal, it
may be necessary to gain altitude in order to receive the broadcast.

For information about FIS-B, and Aviation Weather Services and products, refer to the FAA
Aeronautical Information Manual (AIM), 4-5-9 and AC 00-45, Aviation Weather Service.
For information about weather data display and the associated symbology, refer to the
display operator’s guide. Table 5-1 lists FIS-B weather products and the timing associated
with each.

Transmission Interval is the time between the broadcast of a FIS-B product from a ground
station. Update Interval is how often the FIS-B product updates with information from the
data source provider.

5 - FIS-B WEATHER AND FLIGHT INFORMATION

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide 5-1

Table 5-1 FIS-B Weather Products

NOTE

Transmission

Weather Product

CONUS

NEXRAD

NEXRAD

Regional

AIRMETs

SIGMETs

METARS

Winds

and

Temperatures

Weather

Pilot

TAFs

NOTAMs (includes TFRs)

Report

Some Temporary Flight Restrictions (TFRs) may not appear, or the information
may be incomplete. TFR Information shown is only advisory in nature. To
determine accurate TFR information, verify with official sources, i.e., preflight
planning or flight service center.

Aloft

(PIREP)

Interval

(Minutes)

15 15 minutes

2.5 5 minutes

5 6 hours or as needed

5

5

10 6 hours

10 As available.

10 6 hours. As available for amended TAFs.

10 As available.

As available.
Every hour for convective SIGMETs.

15 minutes to 1 hour (METAR station dependent)

Update Interval

5 - FIS-B WEATHER AND FLIGHT INFORMATION

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6 CONNEXT BLUETOOTH

The GTX 345 Connext interface allows communication with applications
(i.e., Garmin Pilot and ForeFlight Mobile), while running on a PED. Connext works via
the Bluetooth data link to provide up-to-date, wireless information throughout the
cockpit. Refer to section 3.4 for Bluetooth pairing instructions. Up to two Bluetooth
connections are supported by the GTX 345. Table 6-1 lists the GTX 345 Connext
features.

Table 6-1 GTX 345 Connext Features

GTX 345 CONNEXT FEATURES

GPS Position and Velocity

• GPS position and velocity information used by the GTX 345's certified ADS-B
functionality is made available to PEDs.

ADS-B In Traffic

• ADS-B In traffic data that is provided to certified traffic displays is made
available to PEDs. This traffic is also combined with TCAD/TAS/TCAS traffic
when the systems are integrated during installation.

FIS-B Weather and Flight Information

• FIS-B weather and flight information that is provided to certified displays is
made available to PEDs.

Pressure Altitude

• Uncorrected barometric pressure altitude used by the GTX 345's certified
transponder and ADS-B functionality is made available to PEDs.

6 - CONNEXT BLUETOOTH

Attitude and Heading Reference System (AHRS)

• When the GTX 345 is installed as part of an integrated flight deck
(e.g., G500/G600, G1000), AHRS data from an AHRS source is made
available to PEDs.
When the GTX 345 is installed as a stand-alone device, a built-in sensor

•
provides AHRS data to PEDs via Connext. Attitude data is not output to other
installed avionics.

• The internal AHRS sensor is for use in fixed-wing aircraft only and is disabled in
helicopter installations. All internal AHRS functions are automatic and no pilot
action is required.

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7 TROUBLESHOOTING

The GTX 3X5 display system sends messages to the flight crew when trouble or otherwise
abnormal conditions are detected. Table 7-1 outlines troubleshooting actions the flight
crew may take to attempt to resolve each system message. If the actions taken do not
resolve the message, or if there are any questions, the Garmin Product Support
department is available Monday through Friday, 7:00 AM to 7:00 PM Central Time.

US: 913-397-8200
US Toll Free: 1-866-739-5687
Canada Toll Free: 1-866-429-9296
www.fly.garmin.com

To expedite your call, please have the following information ready.

1. System configuration (products, antennas, mounting location, etc.)

2. Model number, part number, and serial number

3. Software version(s)

4.

Description of the problem

5. Efforts made to isolate/solve the problem

7.1 Transponder Failures

The screen in figure 7-1 shows when ADS-B is not transmitting and the aircraft may not
be compliant with 14 CFR 91.225. However, the transponder is still operating. The screen
in figure 7-2 shows if both the transponder and ADS-B are not transmitting and the
aircraft may not be compliant with 14 CFR 91. 215 and 14 CFR 91.225.

7 - TROUBLESHOOTING

Figure 7-1 ADS-B 1090ES Failed Screen

Figure 7-2 ADS-B 1090ES and Transponder Failed Screen

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide 7-1

7.2 Transponder System Messages

NOTE

Messages are not high priority. Their purpose is to provide additional
information on abnormal system behavior. They do not require immediate pilot
action. Any transponder failure will immediately display an alert with no pilot
action necessary to view the alert.

Depending on configuration, active messages display in the bottom left hand corner of
the screen either as a flashing or solid MSG. If the MSG text is configured to flash, the text
stops flashing when all active messages are read.

To view new messages:

1. Press

FUNC

key to SYS group.

2. Press

SYSTEM MESSAGE EXPLANATION FLIGHT CREW ACTION

CRSR

then

ENT

key to view message.

Table 7-1 Troubleshooting

1090 ADS-B In Failed The GTX 3X5 has detected a

1090 receiver fault. Traffic
picture may not be complete.

1090 ADS-B Out Failed The unit cannot transmit ADS-B

messages.

Note:

This message is present
regardless of whether 1090 ES is
on or off.

7 - TROUBLESHOOTING

ADS-B In Failed The GTX 3X5 has detected a

fault in both 1090 and UAT
receivers. ADS-B IN traffic
and FIS-B will not be available.

ADS-B In Traffic
Alerting Failed

The GTX 3X5 does not have
enough information to
provide traffic alerting on
ADS-B targets.

Contact dealer for service.

Contact dealer for service.

Contact dealer for service.

1. Check power and/or circuit breaker
for the GPS position source
(e.g., GTN or GNS).

2. Make sure the GPS antenna has a
clea

r view of the sky a
ugh time for the GPS position

eno
source to obtain a position fix.
Extended periods between use or
GPS position source disconnection
from the aircraft battery could
cause a longer than normal GPS
satellite acquisition time. If
problem persists, contact dealer for
service.

nd provide

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GTX 3X5 XPDR

SYSTEM MESSAGE EXPLANATION FLIGHT CREW ACTION

ADS-B
Position Input Failed

Demo Mode The unit is operating in a

The unit is not receiving GPS.

mode intended for demonstra­tion purposes.

1. Check power and/or circuit breaker
for the GPS position source
(e.g., GTN or GNS).

2. Make sure the GPS antenna has a
clear view of the sky and provide
enough time for the GPS position
source to obtain a position fix.
Extended periods betwee
GPS position source disconnection
from the aircraft battery could
cause a longer than normal GPS
satellite acquisition time.

1. Restart the unit.

2. If problem persists, cycle avionics
master power.

3. If problem persists, contact dealer
for service.

n use or

7 - TROUBLESHOOTING

FIS-B Weather Failed The FIS-B receiver has failed. The

display of FIS-B products may be
unavailable.

Ground Test The unit is operating in a

mode intended for ground
testing.

Maximum
Temperature Exceeded

Minimum
Temperature Exceeded

Pressure Altitude Failed The GTX 3X5 has lost

Service Soon GTX 3X5 has detected an

TAS/TCAS Failed TAS/TCAS is reporting failed

The unit is too hot. The
transponder will not transmit
until it has cooled.

The unit is too cold.
The transponder will not
transmit until it has warmed up.

communication with the
pressure altitude source.

internal fault but the unit will
continue to function.

or the GTX 3X5 has lost
communicating with the
TAS/TCAS.

Contact dealer for service.

Restart the unit.

Use alternate transponder as the
active transponder, if available, to
allow the GTX 3X5 to cool.

Allow time for the GTX 3X5 to warm
up to ensure proper operation.

Check power and/or circuit breaker
for the pressure altitude source
(e.g., altitude encoder, ADC, etc.).

Contact dealer for service.

Check power and/or circuit breaker
for the TCAD/TAS/TCAS I System.

190-01499-00 Rev. E GTX 335/345 Pilot’s Guide 7-3

SYSTEM MESSAGE EXPLANATION FLIGHT CREW ACTION

Traffic Processing Failed The unit cannot process traffic

because the unit isn't receiving
enough information or the unit
has an internal fault.

1. Check power and/or circuit breaker
for the GPS position source
(e.g., GTN or GNS).

2. Make sure the GPS antenna has a
clear view of the sky and provide
enough time for the GPS position
source to obtain a position fix.
Extended periods betwee
GPS position source disconnection
from the aircraft battery could
cause a longer than normal GPS
satellite acquisition time.

3. Check Power and/or circuit breaker
for the TCAD/TAS/TCAS I system.

n use or

UAT ADS-B In Failed The GTX 3X5 has detected a

UAT receiver fault. Traffic
picture may not be complete.

7 - TROUBLESHOOTING

Contact dealer for service.

7-4 GTX 335/345 Pilot’s Guide 190-01499-00 Rev. E

© 2018 Garmin Ltd. or its subsidiaries

Part Number: 190-01499-00 Rev. E