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selected at the last power down and will display the last entered
identification code.
Before Takeoff
1. Transponder Mode Selector Keys .............................................ALT
If the transponder is in STBY or GND mode, it will automatically
switch to ALT during takeoff when the groundspeed increases
through approximately 35 knots. The transponder will respond to
ATC Mode A/C (altitude and identification) interrogations.
• Note •
Selecting ON puts the transponder in Mode A/S only. The
transponder will respond to Mode C (altitude) interrogations
with signals that contain no altitude information.
Original: 07-03-04
4 of 8 P/N 11934-S28
Section 9 Cirrus Design
Supplements SR20
After Landing
1. Transponder Mode Selector Keys ............................. STBY or OFF
If the transponder is in the ALT or ON mode for landing, and the
airplane is in a Mode S environment, the transponder will
automatically switch to GND during landing rollout when the
groundspeed decreases through approximately 35 knots. If the
airplane is not in a Mode S environment, the transponder will
automatically switch to STBY during landing rollout.
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 330 Transponder in the SR20 and a general description
of the unit. For a detailed description of the GTX 330, refer to
GARMIN GTX 330 Mode S Transponder Pilots Guide, p/n
190-00207-00 Revision A (Sept 2002) or later revision.
The Garmin GTX 330 transponder system consists of an integrated
receiver/transmitter control unit, an antenna, and an altitude digitizer.
In addition to displaying the code, reply symbol, and mode of
operation, the GTX 330 displays pressure altitude. The unit also
features an altitude monitor and flight timers. Depending on how the
transponder is configured (factory set to voice), a voice or tone audio
output announces altitude deviation of more than 200 feet and count
down timer expiration.
• Caution •
The transponder’s configuration, including the unique Mode S
aircraft address, is set at time of installation. Use caution when
modifying the configuration. Do not enter the Configuration
Mode during flight.
Original: 07-03-04
P/N 11934-S28 5 of 8
Cirrus Design Section 9
SR20 Supplements
While providing the usual identification code and pressure altitude
information as Mode A and C transponders, the Mode S transponder
also uses a unique aircraft address to enhance the tracking
capabilities of ATC and other Mode S transponder-equipped aircraft.
The interrogations that ground-based surveillance radar transmit
include the identification information of the target airplane ensuring
that when other aircraft receive the interrogation, they will not respond.
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.
Reply Light
The reply light is the small reverse video “R” immediately below the
mode annunciation in the display window. The reply light will blink
each time the transponder replies to ground interrogations. The light
will remain on during the 18-second IDENT time interval.
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 four positions are:
OFF - Turns off all power to the GTX 330 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
　
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