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• 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 pressed, the Mode Selection softkeys appear: XPDR1, XPDR2, 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 either PFD. Code entry must be completed with either the softkeys 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.
122 Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang 190-00494-02 Rev. B
Audio Panel and CNS
SYSTEM
OVERVIEW
FLIGHT
AUDIO PANEL EICAS INSTRUMENTS
& CNS
FLIGHT
MANAGEMENT
HAZARD
ADDITIONAL AFCS AVOIDANCE
INDEX APPENDICES FEATURES
Figure 4-35 Transponder Softkeys (PFD)Pressing the BACK Softkeyreturns to the top-level softkeys.Pressing the BACK Softkey returns to the mode selection softkeys.MSGMSGBACKBKSPIDENT76543210STBYONALTVFRCODEIDENTBACKXPDRGNDIDENTXPDR1XPDR2
Selecting and activating Transponder 1 or Transponder 2:
1) Press the XPDR Softkey to display the Transponder Mode Selection Softkeys.
2) Press the XPDR1 or XPDR2 Softkey to select and activate the other transponder.
When turning on the G1000 for use, the system activates Transponder 1 as the default unit, regardless of which transponder was active prior to shutdown. When switching between Transponder 1 and Transponder 2, the code and mode remain the same. If a new code is entered in the active transponder, switching transponders does not bring back the previous code.
Transponder Mode Selection
Mode selection can be automatic (Ground and Altitude Modes) or manual (Standby, ON, and Altitude Modes). The STBY, ON, and ALT Softkeys can be accessed by pressing the XPDR Softkey.
Selecting a transponder mode:
1) Press the XPDR Softkey to display the Transponder Mode Selection Softkeys.
2) Press the desired softkey to activate the transponder mode.
190-00494-02 Rev. B Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang 123
Audio Panel and CNS
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS EICAS AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE AFCS ADDITIONAL
FEATURES APPENDICES INDEX
Ground Mode
Ground Mode is normally selected automatically when the aircraft is on the ground. The transponder powers up in the last mode it was in when shut down. Ground Mode can be overridden by pressing any one of the Mode Selection Softkeys. A green GND indication and transponder code appear in the mode field of the Transponder Data Box. In Ground Mode, the transponder does not allow Mode A and Mode C replies, but it does permit acquisition squitter and replies to discretely addressed Mode S interrogations.
When Standby Mode has been selected on the ground, the transponder can be returned to Ground Mode by pressing the GND Softkey.
GND ModeFigure 4-36 Ground Mode
Standbytandby Mode (Manualanual) NOTE: In Standby Mode, the IDENT function is inhibited.
Standby Mode can be selected at any time by pressing the STBY Softkey. In Standby, the transponder does not reply to interrogations, but new codes can be entered. When Standby is selected, a white STBY indication and transponder code appear in the mode field of the Transponder Data Box. In all other modes, these fields appear in green.
　
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