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Garmin G1000 Cockpit Reference Guide for Mooney M20M & M20R
30
SECTION 2 – PFD
Transponder Status Bar
The Transponder Status Bar displays the transponder
code, reply symbol, and mode of operation. TIS (Traffic
Information System) surveillance data up-linked by Air
Traffic Control (ATC) radar through the GTX33 Mode S
Transponder appears on the Inset Map (PFD), Navigation
and Traffic Map Pages on the MFD (refer to the MFD Pilot’s
Guide). 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 interrogations when GND is
annunciated. If a delay time is set in Configuration Mode,
the transponder waits a specified length of time after land
-
ing before changing to
GND mode.
Transponder Operation
Pressing the
XPDR softkey displays the second-level
softkeys:
STBY – Selects standby mode. When in standby
mode, the transponder does not reply to any
interrogations.
ON – Selects Mode A. In this mode, the transpon-
der replies to interrogations, as indicated by the
Reply Symbol (R). Replies do not include altitude
information.
ALT – Selects Mode C. In ALT mode, the tran-
sponder replies to identification and altitude
interrogations as indicated by the Reply Symbol
(R). Replies to altitude interrogations include the
standard pressure altitude received from an exter
-
nal altitude source, which is not adjusted for baro
-
metric pressure. The ALT mode may be selected
in aircraft not equipped with an optional altitude
encoder; however, the reply signal will only reply
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).
CODE – Displays the transponder code selection
softkeys, which includes the digits 0-7 and BKSP.
IDENT – Pressing the IDENT softkey activates
the Special Position Identification (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 those keys begins the code selection se
-
quence. 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 Pilot’s Guide).
Figure 2-30 Transponder Status Bar
2.5 ALERTS AND ANNUNCIATIONS
Alerts and Annunciations that appear on the PFD are
described in detail in Appendix A of this Cockpit Refer-
ence Guide.
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