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airplane itself may result in reduced range. Range can be
improved by climbing to a higher altitude.
After Engine Start
1. Avionics Power Switch ...............................................................ON
The transponder will turn on in the STBY mode. The transponder
is “on” but will not respond to interrogations from ATC secondary
surveillance radar.
Before Takeoff
1. Transponder Mode Selector Keys .............................................ALT
If the transponder is in the STBY mode, it will automatically switch
to ALT during takeoff when the groundspeed increases through
approximately 35 knots. The transponder will respond to ATC
Mode C (altitude and identification) interrogations.
• Note •
Selecting ON puts the transponder in Mode A (identification)
only. The transponder will respond to Mode C (altitude)
interrogations with signals that contain no altitude information.
After Landing
1. Transponder Mode Selector Keys ............................. STBY or OFF
If the transponder is in the ALT mode for landing, it will
automatically switch to STBY during landing rollout when the
groundspeed decreases through approximately 35 knots.
Original: 12-12-00
4 of 8 P/N 13772-102
Section 9 Cirrus Design
Supplements SR22
Section 5 - Performance
No Change
Section 6 - Weight & Balance
No Change
Section 7 - Systems Description
• Note •
This supplement provides specific procedures for use of the
GTX 327 Transponder in the SR22 and a general description
of the unit. For a detailed description of the GTX 327, refer to
GARMIN GTX 327 Mode A/C Transponder Pilots Guide, p/n
190-00187-00 Revision A (Feb 2000) or later revision.
The Garmin GTX 327 transponder system consists of the integrated
receiver/transmitter control unit, an antenna, and an altitude digitizer.
The receiver/transmitter receives interrogations from a ground-based
secondary surveillance radar transmitter and then transmits to the
interrogating Air Traffic Control Center. Digitized altitude information is
provided by the altitude digitizer (encoder) plumbed into the airplane
static system. The transponder and integrated controls are mounted in
the center console. The transponder control provides active code
display, code selection, IDENT button, and test functions. The display
is daylight readable and is automatically dimmed through a photocell.
The controller buttons are dimmed through the INST lights control on
the instrument panel bolster. The transponder antenna is mounted on
the underside of the fuselage just aft of the firewall. 28 VDC for
transponder operation is controlled through the Avionics Master
Switch on the bolster switch panel. 28 VDC for receiver, transmitter,
and altitude encoder operation is supplied through the 2-amp
ENCODER/XPONDER circuit breaker on the Avionics Non-Essential.
Original: 12-12-00
P/N 13772-102 5 of 8
Cirrus Design Section 9
SR22 Supplements
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.
• Note •
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 respectively. The transponder will respond to
interrogations with the airplane’s identification code and standard
pressure altitude (29.92 inches Hg).
• Note •
ALT mode is automatically entered from STBY mode during
takeoff ground roll as the groundspeed increases through 35
knots.
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