Garmin 0104400, 0104450 Users Manual

GNS 430(A) Pilot’s Guide and Reference

190-00140-00 Rev. P

12-11

SECTION 12

ADDITIONAL FEATURES

12.2 TRAFFIC ADVISORY SYSTEMS (TAS)

Introduction

All information in this section pertains to the display

and control of the Garmin GNS 430/GTS 800 interface.

NOTE: This section assumes the user has

experience operating the GNS 430 and the
GTS 800.

NOTE: References to the GTS 800 throughout

this document refer equally to the GTS 820 and
GTS 850 unless otherwise noted.

System Description

The GNS 430 provides an optional display interface for

the GTS 800 Trafc Advisory System (TAS). The GTS 800

monitors the airspace surrounding an aircraft, and advises

the ight crew where to look for transponder-equipped

aircraft that may pose a collision threat.

Symbol Traffic Type Description

Traffic
Advisory (TA)

A TA (Traffic Advisory) is generated when the GTS 800 predicts that an intruder aircraft may
pose a collision threat. A solid yellow circle represents an intruder aircraft that is on a course
that projects to intercept (defined by a 0.5 nm horizontal radius and a relative altitude of
± 500 ft) the pilot’s current course within 34 seconds. A TA consists of the traffic symbol and
an aural alert (e.g., “traffic, 12 o’clock, high, 3 miles”).

Out-of­Range Traffic
Advisory

This solid yellow half circle appears (on the outer range ring) under the same conditions and
has the same urgency as a TA. Its appearance differs from the TA only to signify that the
intruder is outside of the current range of the Traffic Page.

Proximity
Advisory (PA)

Proximity Advisories (PA) are displayed as solid white diamonds. PAs are defined as traffic
within the 6.0-nm range, within ±1200 ft. of altitude separation, and are not a traffic advisory
(TA).

Other Traffic
Symbol

This symbol (hollow white diamond) represents traffic detected within the selected display
range that does not meet the criteria for a TA or a PA and does not pose an immediate collision
threat.

Table 12-4 TAS Symbology

The GTS 800 is an active trafc advisory system that

operates as an aircraft-to-aircraft interrogation device.

When the GTS 800 receives replies to its interrrogations, it

computes the responding aircraft’s range, bearing, relative
altitude, and closure rate; it then plots the traffic location
and predicts collision threats.

Traffic Symbology

Trafc information from the GTS 800 is displayed on
the GNS 430 unit using TAS symbology (Table 12-4) on
a dedicated Trafc page, and on the moving Map Page.

The displayed traffic information generally includes the
relative range, bearing, and altitude of intruder aircraft.

The GTS 800 also generates aural announcements heard

on the cockpit audio system.

GNS 430(A) Pilot’s Guide and Reference

190-00140-00 Rev. P

12-12

SECTION 12

ADDITIONAL FEATURES

Altitude deviation (Figure 12-20) from own aircraft

altitude is displayed (in hundreds of feet) for each target

symbol. If traffic is above own aircraft altitude the

deviation is shown above the target next to a ‘+’ symbol.

If traffic is below own aircraft altitude the deviation is

shown below the target next to a ‘-’ symbol.

Altitude trend (Figure 12-20) is displayed as an up
arrow (> +500 fpm), down arrow (< -500 fpm), or no
symbol if less than 500 fpm rate in either direction.

Figure 12-20 Traffic Symbol Components

Altitude

Deviation

Altitude
Trend

Traffic

Type

Aural Alerts

A TA consists of a displayed trafc symbol (solid yellow
circle) and an aural alert. The aural alert announces

“traffic”, followed by the intruder aircraft’s position,

altitude relative to own aircraft (“high”, “low”, or “same
altitude”), and distance from own aircraft; e.g. “trafc, 12

o’clock, high, 3 miles”.

Power-up Self-Test

Check for the following test criteria on the Trafc Page

during power-up:

• If the GTS 800 passes the power-up test; and
the aircraft both has a squat switch and is on the

ground, the Standby Screen is displayed (Figure
12-21).

• If the GTS 800 passes the power-up test and the

aircraft both has a squat switch and is airborne,

the Trafc Page is displayed on the 6-nm display

range and in the normal altitude display mode.

• If the GTS 800 passes the power-up test and the
aircraft does not have a squat switch, the Standby

Screen is displayed (Figure 12-21).

• If the GTS 800 fails the power-up test (as
indicated by a FAILED screen), the GTS 800 is
inoperable, see the GTS 800 Installation Manual

for detailed information on Failure Response.

Figure 12-21 Standby Mode

NOTE: When the system is in standby, the

GTS 800 does not transmit, interrogate, or track
intruder aircraft.

GNS 430(A) Pilot’s Guide and Reference

190-00140-00 Rev. P

12-13

SECTION 12

ADDITIONAL FEATURES

Tracking intruder aircraft

1) Press the small right knob to activate the

cursor and highlight ‘STBY’.

2) Turn the small right knob to select ‘OPER’.

3) Press the ENT Key to confirm operating mode

and begin tracking intruder aircraft.

NOTE: The FAILED message is displayed when

the system detects an error that prohibits further
traffic display operation.

User-initiated Test

In addition to the power-up test, the GTS 800

performs self-tests during normal operation. A self-test

is performed once per minute to verify that the antenna

is connected. Also, a calibration is performed at varying
intervals based on time and temperature. A user-initiated
test of the GTS 800 interface can also be performed.

NOTE: A user-initiated test can only be performed
when in standby or failed mode.

Performing a user-initiated test:

1) Turn the small right knob to select the Traffic

Page.

2) From the Traffic Page, press the MENU Key to

display the Page Menu.

3) Turn the small right knob to select ‘Self

Test?’.

4) Press the ENT Key.

Switching Between Standby and Operating
Modes

The unit must be in operating mode for traffic to be
displayed. The ability to switch out of standby into operating
mode on the ground is especially useful for scanning the

airspace around the airport before takeoff. Operating Mode
is conrmed by the display of ‘OPER’ in the upper right­hand corner of the Trafc Page (Figure 12-22).

Switching to Operating Mode from Standby
Mode:

1) Press the small right knob to activate the

cursor and highlight ‘STBY’.

2) Turn the small right knob to select ‘OPER?’.

3) Press the ENT Key to confirm and place the

GTS 800 in operating mode, the GTS 800
switches out of standby into the 6-nm display
range.

NOTE: If the aircraft has a squat switch and the
pilot does not manually switch out of standby, the
GTS 800 will automatically switch out of standby
8 to 10 seconds after takeoff.

Switching to Standby Mode from the Traffic
Page:

1) Press the small right knob to activate the

cursor and highlight ‘OPER’.

2) Turn the small right knob to select ‘STBY?’.

3) Press the ENT Key to confirm and place the

GTS 800 in standby mode.

NOTE: If the aircraft has a squat switch, STBY is
not displayed while the aircraft is airborne but
will go into standby 24 seconds after landing.
This delay allows the GTS 800 to remain out of
standby during a touch-and-go maneuver.