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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.
Original: 12-12-00
6 of 8 P/N 13772-102
Section 9 Cirrus Design
Supplements SR22
Code Selector Keys
Code selection is accomplished by depressing the eight selector keys
(numbered 0 - 7) located immediately below the display. Any of 4096
active identification codes can be selected. The selected code must be
in accordance with instructions for IFR flight or rules applicable to
transponder utilization for VFR flight.
The airplane’s transponder code is used to enhance tracking capability
by ATC. Therefore, do not switch the transponder to STBY when
making routine code changes.
Input a New Code
1. Use CLR key to remove the current code.
2. Use “0 - 7” keys to input the new code. The new code will not be
activated until the last (fourth) digit is entered. Pressing the CLR
key will move the cursor back to the previous digit. Pressing the
CRSR key during code entry will remove the cursor and cancel the
entry.
• Note •
When making routine code changes, avoid inadvertent
selection of code 7500 and all codes within the 7600 series
(7600 – 7677) and 7700 series (7700 – 7777). These codes
trigger special indicators in automated facilities. 7500 will be
decoded as the hijack code.
Important Codes
• 1200 – VFR code for any altitude in U.S.
• 7000 – VFR code commonly used in Europe
• 7500 – Hijacking
• 7600 – Loss of communications
• 7700 – Emergency
• 7777 – Military interceptor operations (Never squawk this code)
• 0000 – Military use only (not enterable)
Original: 12-12-00
P/N 13772-102 7 of 8
Cirrus Design Section 9
SR22 Supplements
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.
IDENT Key
Pressing the IDENT button activates the Special Position Identification
(SPI) pulse for approximately 18 seconds allowing ATC to identify your
transponder return from other returns on the controller’s scope. The
Reply annunciator in the display will illuminate during the SPI pulse.
Momentarily press the IDENT key when the controller requests,
“SQUAWK IDENT.”
VFR Key
Pressing the VFR key sets the transponder to the pre-programmed
VFR code selected in the configuration mode (factory set to 1200).
Pressing the VFR key a second time will restore the previous
identification code.
FUNC Key
Pressing the FUNC key changes the data shown on the right side of
the display. Pressing the FUNC key a second time will cycle the
display to the next data. Displayed data includes Pressure Altitude,
Flight Time, Count Up Timer, Count Down Timer, Contrast, and
Display Brightness.
PRESSURE ALT - Displays pressure altitude in feet. An arrow to the
right of the altitude indicates that the airplane is climbing or
descending.
FLIGHT TIME - Displays the flight time. The timer receives
groundspeed from GPS1. Flight time starts when the groundspeed
reaches 35 knots on takeoff and pauses when the groundspeed
descends below 35 knots on landing.
COUNT UP TIMER - The count up timer is controlled by the START /
STOP key. Pressing the CLR key zeros the display.
Original: 12-12-00
8 of 8 P/N 13772-102
Section 9 Cirrus Design
Supplements SR22
COUNT DOWN TIMER - The count down timer is controlled by the
　
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