Cirrus SR22 Pilot Operating Handbook page 339

Cirrus Design
SR22
Mode Selector Keys
The mode selector keys are located in a circular arrangement
immediately to the left of the display window. The selected mode is
annunciated at the left side of the display immediately adjacent to the
selector keys. The five positions are:
OFF - Turns off all power to the GTX 327 transponder. The
transponder should be off until the engine is started. Normally, the
transponder can be left in the STBY position and allow the Avionics
Power Switch to control system power.
STBY - Powers the transponder in standby mode. The last active
identification code will be selected. In STBY, the transponder will not
reply to any interrogations from an ATC secondary ground surveillance
radar system. This is the normal position for ground operations in the
SR22.
STBY mode is automatically entered from ALT mode during
landing ground roll as the groundspeed decreases through 35
knots.
ON - Powers on the GTX 327 in Mode A (identification mode.). The
last active identification code will be selected. In addition to the
airplane's identification code, the transponder will also reply to altitude
(Mode C) interrogations with signals that do not contain altitude
information.
ALT - Places the transponder in Mode A and Mode C, identification
and altitude
interrogations with the airplane's identification code and standard
pressure altitude (29.92 inches Hg).
ALT mode is automatically entered from STBY mode during
takeoff ground roll as the groundspeed increases through 35
knots.
P/N 13772-102
Original: 12-12-00
respectively.
• Note •
The transponder
• Note •
Section 9
Supplements
will respond
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to