Pilot's Guide

Garmin G1000 Pilot’s Guide for the Tiger AG-5B 190-00617-00 Rev. A
2-22
CNS
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 the
Air Traffic Control (ATC) radar through the GTX 33
Mode
S Transponder appears on the Inset Map (PFD) and on
the Navigation and Traffic Map Pages on the MFD (refer
to the Multi Function Display section). If the transponder
is configured with Automated Airborne Determination,
normal operation begins when liftoff is sensed. When the
aircraft is on the ground, the window automatically dis
-
plays “GND”. The transponder does not respond to AT
-
CRBS 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. 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 transpon-
der replies to identification and altitude interroga
-
tions as indicated by the Reply Symbol (R). Replies
to altitude interrogations 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 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; refer to ICAO standards for VFR
codes in other countries).
• CODE – Displays the transponder code selection
softkeys, which include 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 these softkeys begins the code selection
sequence. The new code is activated five (5) seconds af
-
ter the fourth digit is entered. Pressing the BKSP softkey
removes one digit at a time until the status bar is empty
(refer to the Transponder section).
Figure 2-34 Transponder Status Bar
PFD.indd 22 7/11/2005 4:28:32 PM