Garmin G1000 Socata TBM 850 User Manual download pdf (Page 135)

190-00709-00 Rev. A

Garmin G1000 Pilot’s Guide for the Socata TBM 850

4-29

AUDIO PANEL AND CNS

4.4 GTX 33/33D MODE S TRANSPONDERS

The GTX 33 Mode S Transponder and GTX 33D Diversity Mode S Transponder provide Mode A, Mode C, and

Mode S interrogation and reply capabilities. Diversity incorporates antennas mounted on the top and bottom of

the aircraft for dependable operation while maneuvering. Selective addressing or Mode Select (Mode S) capability

includes the following features:

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

• Surveillance identiﬁer capability

• Flight ID (Flight Identiﬁcation) reporting – The Mode S Transponder reports aircraft identiﬁcation as either the

aircraft registration or a unique Flight ID.

• Altitude reporting

• Airborne status determination

• Transponder capability reporting

• Mode S Enhanced Surveillance (EHS) requirements

• 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 aircraft equipped with a Trafﬁc Avoidance System (TAS) to

recognize the presence of Mode S-equipped aircraft for selective interrogation.

The Hazard Avoidance Section provides more details on trafﬁc avoidance systems.

TRANSPONDER CONTROLS

Transponder function is displayed on three levels of softkeys on the PFD: Top-level, Mode Selection, and

Code Selection. When the top-level

XPDR

Softkey is selected, the Mode Selection softkeys appear:

XPDR1,

XPDR2, STBY

ALT

VFR

CODE

IDENT

BACK

When the

CODE

Softkey is selected, the number softkeys appear:

IDENT

BKSP,

BACK

. The digits

and

are not used for code entry. Selecting the numbered softkeys in sequence enters

the transponder code. If an error is made, selecting the

BKSP

Softkey moves the code selection cursor to the

previous digit. Selecting the

BKSP

Softkey again moves the cursor to the next previous digit.

Selecting the

BACK

Softkey during code selection reverts to the Mode Selection Softkeys. Selecting the

BACK

Softkey during mode selection reverts to the top-level softkeys.

The code can also be entered with the

FMS Knob on either PFD. Code entry must be completed with either

the softkeys or the FMS Knob, but not a combination of both.

Selecting the

IDENT

Softkey while in Mode or Code Selection initiates the ident function and reverts to the

top-level softkeys.

After 45 seconds of transponder control inactivity, the system reverts back to the top-level softkeys.

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Garmin G1000 Socata TBM 850 User Manual Page 135

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