
Garmin G1000 Cockpit Reference Guide for the Cessna 350/400
190-00567-01 Rev. B
4-4
SECTION 4 – NAV/COM &
TRANSPONDER
4.6 TRANSPONDER
Mode Selection
The STBY, ON, ALT, GND, VFR, CODE, and IDENT
Softkeys can be accessed by pressing the
XPDR Softkey.
Ground Mode (Automatic or Manual)
GND is displayed when the aircraft is on the ground or
when the
GND Softkey is pressed. The transponder does
not allow Mode A and Mode C replies, but it does permit
acquisition squitter and replies to discretely address
Mode S interrogations.
Figure 4-8 Ground Mode
Standby Mode (Manual)
Press the
STBY Softkey. In Standby Mode, the tran-
sponder does not reply to interrogations, but new codes
can be entered.
STBY Mode (White
Code Number and
Mode)
Figure 4-9 Standby Mode
Manual ON Mode
Press the
ON Softkey. ON Mode generates Mode A
and Mode S replies, but Mode C altitude reporting is in-
hibited.
ON Mode
(No Altitude
Reporting)
Figure 4-10 ON Mode
Altitude Mode (Automatic or Manual)
Altitude Mode is automatically selected when the air
-
craft becomes airborne. Altitude Mode may also be se-
lected manually by pressing the ALT Softkey.
All transponder replies requesting altitude information
are provided with pressure altitude information.
ALT Mode (Mode C
Altitude Reporting)
Figure 4-11 Altitude Mode
Reply Status
When the transponder sends replies to interrogations,
an “R” indication appears momentarily in the reply status
field.
Figure 4-12 Reply Indication
Reply
Indication
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