User Guide

Garmin G1000 Pilot’s Guide for the Columbia 350/400
190-00552-00 Rev. A4-36
AUDIO PANEL AND CNS
TRANSPONDER DATA BOX
The Transponder Data Box is located to the left of the System Time Box. The data box displays a four-digit
code field, a mode field and a reply status indicator. In Standby Mode, both the code field and the mode field
appear in white. In all other modes, these fields appear in green.
MODE S FEATURES
The GTX 33 Transponder is equipped with selective addressing or Mode Select (Mode S), capability. Mode S
functions include the following features:
• Level-2 reply data link capability (used to exchange information between aircraft and various ATC facilities)
• Surveillance identifier capability
• Flight ID reporting – The G1000 Transponder reports aircraft identification as either the aircraft registration
or a FLT ID (Flight Identification). The system is configured for either option by an authorized Garmin
service center.
• 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 Traffic Collision Avoidance System
(TCAS) equipped aircraft to recognize the presence of Mode S-equipped aircraft for selective interrogation.