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Mode S Data Transmission
In addition to 4096 code and pressure altitude, the GTX 328 is capable of transmitting
aircraft identification, transponder capability and maximum speed range. “Aircraft
Identification” is commonly referred to as FLT ID (Flight Identification). The GTX 328 may
be configured by the installer to allow the flight crew to enter FLT ID for each flight. An
example is when air-carrier service requires changing the FLT ID.
The FLT ID may consist of the aircraft registration or a flight number as agreed upon with
the local aviation authority. In either case, the FLT ID must be the same aircraft identification
that appears in the flight plan to correlate the aircraft identification seen on ATC radar with the
correct voice call sign for the aircraft. If no flight plan is filed with the aviation authority (as
may be permitted by regulations), the FLT ID entered is the aircraft registration marking.
When flight crew entry of the FLT ID is not required, the installer configures the
system to report the aircraft identification according to local aviation requirements. In this
configuration, alteration of the FLT ID by the flight crew is not possible.
Entering a Flight ID Number
When configured for FLT ID PWR-UP ENTRY at installation, the flight crew must enter
the Flight ID before the GTX 328 will operate. After the flight crew enters the correct Flight
ID, the aircraft identification that is transmitted in response to ATC radar interrogations is
properly correlated with the associated call sign for voice communication with the aircraft.
If the FLT ID PWR-UP ENTRY is required but does not appear at power up, contact a
Garmin authorized service center for GTX 328 configuration.
No space is needed when entering Flight ID characters. When a Flight ID contains a
space, the GTX 328 automatically removes the spaces upon completion of Flight ID entry.
At system power-up the FLT ID
may
appear with no number (as shown) or with the
last FLT ID entered. The cursor covers the
entire FLT ID field.
If the Flight ID appearing at turn-on is
correct, press the
CRSR Key to move the cursor
to the “OK?” field. Press CRSR again to accept
the FLT ID. The transponder then begins
normal operation.
When no FLT ID appears or the FLT
ID must be changed, press the number keys
corresponding to the alphanumeric character
entry. For example, to enter the letter “R” press
the 5 Key four times.