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
www.trig-avionics.com