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Push Buttons 

IDENT 

Press the IDENT button when ATC instructs you to “Ident” 
or “Squawk Ident”.  This activates the SPI pulse in the 
transponder replies for 18 seconds.  IDENT will appear in 
the display. 

FUNC 

Pressing the FUNC button provides access to the flight 
timer, stopwatch and altitude monitor function. 

VFR 

Pressing the VFR button sets the transponder to the pre-
programmed conspicuity code.  Pressing the button again 
restores the previous squawk code. 

FLT/SQ

Pressing FLT/SQ alternates the primary display between 
squawk code and Flight ID. 

ENT 

The ENT button enters a digit in the code selector. 

BACK 

The BACK button goes back to the previous digit in the 
code selector. 

Code Selector Knob 

The right hand knob is used to set squawk codes and the Flight ID.  
The FLT/SQ button selects which will be updated.  Turning the knob 
will highlight the first digit on the display, and the digit can be changed 
as required.  Press the ENT button to advance to the next digit.  When 
ENT is pressed on the last digit, the new squawk code or Flight ID will 
replace the previous value.  If the code entry is not completed within 7 
seconds, the changes are ignored and the previous code restored. 

1200 

VFR code in the USA 

7000 

VFR code commonly used in Europe. 

7500 Hijack 

code 

7600 

Loss of communications 

7700 Emergency 

code 

The Flight ID should correspond to the aircraft call sign entered on 
your flight plan.  If no flight plan is active, the aircraft registration 
should be used as your Flight ID.  Use only letters and digits.  If the 
Flight ID is less than 8 characters long, entering a blank character will 
end it. 

Flight Timer 

The Flight Timer records the time for which the transponder has been 
powered on and operating in flight mode – either ON or ALT.  Press 
the FUNC button to display the Flight Timer. 

Содержание TT31

Страница 1: ...TT31 Mode S Transponder Operating Manual 00454 00 AA 1 September 2006 Trig Avionics Limited Heriot Watt Research Park Riccarton Currie EH14 4AP Scotland UK Copyright 2006 ...

Страница 2: ...he power to the transponder and the operating mode OFF Power is removed from the transponder SBY The transponder is on but will not reply to any interrogations GND The transponder will respond to Mode S ground interrogations from surface movement radar ON The transponder will respond to all interrogations but altitude reporting is suppressed ALT The transponder will respond to all interrogations W...

Страница 3: ...will be updated Turning the knob will highlight the first digit on the display and the digit can be changed as required Press the ENT button to advance to the next digit When ENT is pressed on the last digit the new squawk code or Flight ID will replace the previous value If the code entry is not completed within 7 seconds the changes are ignored and the previous code restored 1200 VFR code in the...

Страница 4: ...s first installed by your avionics supplier Configuration items include the Mode S aircraft address the aircraft category and the pre programmed values for VFR squawk code To view or change these settings you must use Configuration Mode Do not use Configuration Mode in flight Check with your avionics installer before changing the configuration To enter configuration mode hold down the FUNC button ...

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