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190-00498-00 Rev. A Garmin G1000 Pilot’s Guide for Cessna Nav III

2-23

PRIMARY FLIGHT DISPLAY

TRANSPONDER STATUS BAR

The Transponder Status Bar displays the transponder

code, reply symbol, and mode of operation.

Figure 2-36 Transponder Status Bar

TIS (Trafﬁc Information System) surveillance data

up-linked by ATC radar through the GTX 33 Mode S

Transponder appears on the PFD Inset Map and on the

MFD Navigation and Trafﬁc Map Pages (refer to the

Multi Function Display section). If the transponder is

conﬁgured with Automated Airborne Determination,

normal operation begins when lift-off is sensed.

When the aircraft is on the ground, the window

automatically displays “GND”. The transponder does

not respond to ATCRBS (ATC Radar Beacon System)

interrogations when GND is annunciated. If a delay time

is set in Conﬁguration Mode, the transponder waits a

speciﬁed length of time after landing before changing to

GND mode.

Transponder Operation

Pressing the XPDR softkey displays the second-level

softkeys:

• STBY – Selects standby mode (transponder does

not reply to any interrogations)

• ON – Selects Mode A (transponder replies to

interrogations, as indicated by the Reply Symbol,

R; replies do not include altitude information)

• ALT – Selects Mode C

In ALT mode, the transponder replies to identiﬁca

tion and altitude interrogations, as indicated by

the Reply Symbol (R). Replies to altitude inter-

rogations include the standard pressure altitude

received from an external altitude source (not

adjusted for barometric pressure). The ALT mode

may be selected in aircraft not equipped with an

optional altitude encoder; however, in this case, the

reply signal only replies to mode A interrogations.

The transponder also responds to interrogations

from TCAS-equipped aircraft.

• VFR – Sets the transponder code to the pre-pro-

grammed VFR code selected in Conﬁguration

Mode (this is set to 1200 at the factory in the

U.S.A. only; please refer to ICAO standards for

VFR codes in other countries)

• CODE – Displays the transponder code selection

softkeys, which include digits 0-7 and BKSP

• IDENT – Activates the Special Position Identiﬁca-

tion (SPI) Pulse for 18 seconds, identifying the

transponder return on the ATC screen

Transponder Code Selection

Transponder code selection is performed with eight

softkeys (0-7) providing 4,096 active identiﬁcation codes.

Pushing one of these softkeys begins the code selection

sequence. The new code is activated ﬁve seconds after

the fourth digit is entered. Pressing the BKSP softkey

removes one digit at a time until the status bar is empty

(refer to the Mode S Transponder section).

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