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override the XM audio signal. Refer to the Intercom Modes
Table presented above for a description of intercom modes.
The XM Radio System is powered by 28 VDC supplied through the 3-
amp Weather/Stormscope breaker on the Non-Essential Bus.
Revision 02: 07-18-05
P/N 11934-S12 1 of 8
Cirrus Design Section 9
SR20 Supplements
Pilot’s Operating Handbook and
FAA Approved Airplane Flight Manual
Supplement
for
Garmin GTX 327 Transponder
When a Garmin GTX 327 Transponder is installed in the Cirrus Design
SR20, this Supplement is applicable and must be inserted in the
Supplements Section (Section 9) of the Cirrus Design SR20 Pilot’s
Operating Handbook. This document must be carried in the airplane at
all times. Information in this supplement adds to, supersedes, or
deletes information in the basic SR20 Pilot’s Operating Handbook.
26 Dec 2000
Original: 12-26-00
2 of 8 P/N 11934-S12
Section 9 Cirrus Design
Supplements SR20
Section 1 - General
The airplane is equipped with a single Garmin GTX 327 ATC Mode A/
C (identification and altitude) transponder with squawk capability. This
supplement provides complete operating instructions for the GTX 327
and does not require any additional data be carried in the airplane.
SR20_FM09_1501
1 2 3 4 5
10 9 8 7 6
1. Identification Key
2. Mode Selector Keys
a. OFF
b. STBY (Standby)
c. ON
d. ALT
3. Display Window
4. FUNC (Function) Key
5. CRSR (Cursor)
6. CLR (Clear) Key
7. START/STOP Key
8. Photocell
9. VFR Key
10. Selector Keys
a. 0-7 - Code Selection
b. 8-9 - Display Brightness/Contrast
Original: 12-26-00
P/N 11934-S12 3 of 8
Cirrus Design Section 9
SR20 Supplements
Section 2 - Limitations
No Change
Section 3 - Emergency Procedures
No Change
Section 4 - Normal Procedures
• Note •
Expected coverage from the GTX 327 is limited to “line of
sight.” Low altitude or aircraft antenna shielding by the
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: 12-26-00
4 of 8 P/N 11934-S12
Section 9 Cirrus Design
Supplements SR20
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 SR20 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
　
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