TRIG TT32 Mode S Transponder User Manual
- June 5, 2024
- TRIG
Table of Contents
TT32 and TT32G Transponder Operating Manual
01846-00-AB 17 June 2021
Trig Avionics Europe B.V. Hardwareweg 3 3821 BL Amersfoort Netherlands
© Copyright 2021
DRAFT COPY
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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 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.
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. If your installation includes a squat switch
or is configured with an automatic air/ground system, the transponder should
be left in ALT mode and it will switch automatically to GND mode on landing or
whilst taxiing. GND will appear on the display.
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 flight ID setup, flight
timer, stopwatch, ADS-B monitor (depending on installation) and altitude
monitor functions, in that order.
VFR Pressing the VFR button sets the transponder to the pre-programmed
conspicuity code. Pressing the button again restores the previous squawk code.
ENT The ENT button confirms options and menu selections.
Squawk Code Entry
Press any of the numeric buttons (0 through 7) to change the squawk code. A
new squawk code is set when the fourth digit is entered. If the code entry is
not completed within 7 seconds, the changes are ignored and the previous code
restored. Some standard squawk codes are listed below
1200 VFR code in the USA
7000 VFR code commonly used in Europe
7500 Hijack code
7600 Loss of communications
7700 Emergency code
Setting Flight ID
Select the Flight ID screen using the FUNC button and press ENT to edit the
Flight ID using the number buttons corresponding to the letters A-Z and
numbers 8 and 9.
Repeatedly pressing the number button will cycle through the letters shown
underneath the number on the lower portion of the display. Press ENT to select
the character and advance to the next character. The flight ID is terminated
with a “space” character located on the 7 button or when all eight characters
are set. When ENT is pressed on the last character, the new Flight ID will
replace the previous value.
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.
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.
Timer 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.
ADS-B Position Monitor
The ADS-B Monitor is only available on installations that include an ADS-B
position source. The ADS-B Monitor provides a display of the position
information that is being transmitted in ADS-B position reports. This can
provide confirmation that the correct information is being transmitted,
particularly where the GPS source is remote from the transponder.
In the event that valid position information is NOT available from the GPS,
the latitude and longitude display will be replaced by dashes; if no valid
latitude and longitude is shown then ADS-B position information is NOT being
transmitted. Loss of ADS-B position information will also result in a WARNING
message being displayed.
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 250 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.
Warning Messages
If the transponder detects a problem, the screen will indicate WARNING and a
brief statement of the problem. Depending on the nature of the problem, your
transponder may not be replying to interrogations. Note the message on the
screen and pass that information to your avionics maintenance organisation.
Press ENT to clear the message; if the fault is still present the message will
reappear.
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.
Some FAULT indications can be recovered by switching the transponder off and back on again, although in all cases a FAULT code implies that there is a fault with the transponder or the installation. Note the FAULT message at the bottom of the screen and pass that information to your avionics maintenance organisation.
Configuration Mode
The system is configured when it is first installed by your avionics supplier.
Configuration items include the Mode S aircraft address, the interface to the
other aircraft systems, 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 numerical buttons
and ENT button. 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 TT32 and TT32G are 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.
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Trig Avionics Europe B.V.
Hardwareweg 3 3821 BL Amersfoort, Netherlands Tel: +31(0)33 782 0900
Trig Avionics Limited
Heriot Watt Research Park Edinburgh, EH14 4AP, UK Tel: +44(0)131 449 8810
[email protected]
www.trig-avionics.com
References
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