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identification code will be selected. In STBY, the transponder will not
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Section 9 Cirrus Design
Supplements SR20
reply to any interrogations from an ATC secondary ground surveillance
radar system. This is the normal position for ground operations in the
SR20.
• Note •
Depend on the ATC environment, STBY or GND mode is
automatically entered from ALT or ON mode during landing
ground roll as the groundspeed decreases through 35 knots.
ON - Powers on the GTX 330 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 last active identification code will be
selected. The transponder will respond to interrogations with the
unique aircraft address 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.
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 “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
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Cirrus Design Section 9
SR20 Supplements
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)
Function Keys
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,
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Section 9 Cirrus Design
Supplements SR20
Flight Time, Count Up Timer, Count Down Timer, Contrast, and
Display Brightness.
START/STOP Key - Starts and stops the Altitude Monitor, Count Up,
Count Down, and Flight timers. In Configuration Mode, steps through
functions in reverse.
CRSR Key - Initiates starting time entry for the Count Down timer.
Returns cursor to last code digit within five seconds after entry. Selects
changeable fields in Configuration Mode.
CLRL Key - Resets the Count Up, Count Down, and Flight timers.
Cancels the previous keypress during code selection and Count Down
entry. Returns cursor to the fourth code digit within five seconds after
entry.
Function Display
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
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