Trig Avionics 00220 AVIATION SERVICES TRANSPONDER TRANSMITTER User Manual USERS MANUAL

Trig Avionics Limited AVIATION SERVICES TRANSPONDER TRANSMITTER USERS MANUAL

USERS MANUAL

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
Front Panel Display The display shows the operating mode of the transponder, the reported pressure altitude, and the current squawk code and Flight ID. The reply indicator is active when the transponder replies to interrogations. The pressure altitude is displayed as a Flight Level, which is the pressure altitude in hundreds of feet. When non-standard atmospheric conditions apply, this may not match the altimeter indicated altitude, but will be correctly displayed by the ATC radar. Mode Selector Knob The left hand knob controls the 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. When airborne, the transponder should always be set to ALT unless otherwise directed by Air Traffic Control. When you are taxiing on the ground, the transponder should be set to GND unless your installation includes a gear squat switch. Aircraft installations that include a gear squat switch will automatically select GND on landing.
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.
Stopwatch The stopwatch can be used as a convenient timer. Press the FUNC button to display the stopwatch. Pressing ENT will reset and start the timer. Pressing ENT again will stop the timer. Altitude Monitor The Altitude Monitor activates an audio annunciator or annunciator light (depending on installation) when the aircraft pressure altitude differs from the selected altitude by more than 200 feet. Press the FUNC button to display the altitude monitor enable screen. Pressing ENT toggles the altitude monitor at the current altitude. When altitude monitoring is in use, a small deviation pointer appears adjacent to the altitude display on the transponder. Fault Annunciation If the transponder detects an internal failure, the screen will indicate FAULT and a brief statement of the problem. No replies will be made to interrogations when a fault is detected. Configuration Mode The system is configured when it is 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 whilst switching on the transponder. Configuration items can be changed using the Code Knob and the ENT and BACK buttons. Pressing FUNC advances to the next configuration item. When configuration is complete, switch the transponder off. When it is switched back on the transponder will use the new configuration. Low Temperature Operation The TT31 is certified to operate correctly down to -20C, but at low temperatures the display may be impaired. On a cold day you may need to wait for the cockpit to warm up to ensure normal operation. Trig Avionics Limited Building 4, Heriot Watt Research Park Riccarton, Currie EH14 4AP, UK Tel: +44 (0)131 449 8810 Fax: +44 (0)131 449 8811 support@trig-avionics.com www.trig-avionics.com

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