Cirrus SR2x

AUDIO PANEL AND CNS
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICES
INDEX
4.4 GTX 32/GTX 33 TRANSPONDER
The GTX 32 Transponder provides Mode A and Mode C interrogation and reply capabilities.
The GTX 33 or GTX 33 with Extended Squitter Mode S Transponder provides Mode A, Mode C, and Mode S
interrogation and reply capabilities. 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.
• Extended squitter (optional with GTX 33 w/Extended Squitter only) – The extended squitter is transmitted
periodically and contains information such as altitude (barometric and GPS), GPS position, and aircraft
identification. The purpose of extended squitter is to provide aircraft position and identification to ADS-B
Ground-Based Transceivers (GBTs) and other aircraft.
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 pressed, the Mode Selection softkeys appear: STBY, ON,
ALT, VFR, CODE, IDENT, BACK.
When the CODE Softkey is pressed, the number softkeys appear: 0, 1, 2, 3, 4, 5, 6, 7, IDENT, BKSP,
BACK. The digits 8 and 9 are not used for code entry. Pressing the numbered softkeys in sequence enters
the transponder code. If an error is made, pressing the BKSP Softkey moves the code selection cursor to the
previous digit. Pressing the BKSP Softkey again moves the cursor to the next previous digit.
Pressing the BACK Softkey during code selection reverts to the Mode Selection Softkeys. Pressing the BACK
Softkey during mode selection reverts to the top-level softkeys.
The code can also be entered with the FMS Knob on the PFD or the XPDR Key and numeric keypad or
FMS/XPDR NAV/COM Knob. Code entry must be completed with either the softkeys, numeric keypad, or the
FMS Knob, but not a combination of both.
Pressing 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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Pilot’s Guide for the Cirrus SR2x with Cirrus Perspective by Garmin
190-00820-11 Rev. A