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Part# 11-12073
MFR Model# ASA-00271-SU


  • Compact size, low weight - takes minimal panel space, only 74mm deep.
  • 8.33 and 25 kHz channel spacing
  • Dual watch – monitor two frequencies at the same time
  • Unique ‘Push Step’ feature provides the fastest frequency selection
  • Low power consumption
  • 6 Watts nominal output
  • Simple installation
  • EASA ETSO and FAA TSO certification
  • Unbeatable value and quality – designed and manufactured in the U.K.
  • Two year worldwide warranty
The majority of GA users including light sport, ultra-light, glider and balloon pilots will fit the Trig TY91 radio, this lower powered 6 watt model is ideal for the majority of applications.

The Trig TY91 takes up minimal space and weight. With a crisp clear display and simple user interface the Trig radio benefits from some great features; the ‘Dual Watch’ feature allows the monitoring of two frequencies at the same. There are 9 pre-set channel memories which are all easily selectable. The radio can integrate with popular GPS units; this allows the automatic display of en-route radio frequencies (uses industry standard SL40 protocol). The radio also has a built-in two place intercom with an aux-input, saving further cost and weight.

The innovative use of a control head and separate radio hardware unit provides more installation options, especially when space is at a premium. The control head can be conveniently mounted in a full 57mm (2 ¼”) round hole or even smaller compact mount. Fitting is straightforward, and once installed the depth of the radio control head is only 74mm (3”). In practice this means that the Trig TY91 and TY92 control head can be located in an aircraft instrument panel where a ‘single box’ radio will simply not fit. The TY91 is the perfect comms partner to our TT21 and TT22 Mode S (1090 ES ADS-B Out transponders).

The TY91 is EASA ETSO and FAA TSO approved so it can be used worldwide. For customers who do not require 8.33 channel spacing this feature can be disabled, allowing speedy selection between 50 kHz and 25 kHz spacing. This enables rapid change of frequency whilst providing fine tuning in 25 kHz steps if required.

The TY91 Trig radio two place intercom is optimised for use with standard aviation headsets – a number of adjustments allow the radio to be used successfully in noisy aircraft. The TY91 also has a built in speaker amplifier that can drive an external speaker, this is preferred by some glider pilots. If using a dynamic microphone with a Trig radio please note an amplified adaptor will be required.

All Trig products come with a two year warranty, supported by our global network of Approved Trig Dealers and Approved Trig Service Centers in the U.S. and Australia.
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WARNING: Cancer and Reproductive Harm -


  • Can be set at 25 kHz and 8.33 kHz
  • Receiver - Class C, Class E / Transmitter - Class 4, Class 6
  • 6 Watt power output
  • Compact and light weight
  • Take up minimal space and weight
  • Dual watch and two place intercom
  • Operation is simple, rapid frequency selection
  • Nine programmable memories
  • Can be battery operated
  • Full certified
  • Compliments Trig's TT21 and TT22 Mode S Transponders
  • Flexible installation options due to 2 piece design
  • Can be mounted in a standard 2 1/4" hole or even smaller compact mount
  • Once fitted, the depth of the radio control head is less than 1 1/2" deep
  • Crisp display, visible in all lighting conditions
  • TY91 is a lower powered model, ideal for light sport, ultra light, glider and balloon pilots and majority of GA users


I have not installed this yet, but it came as expected and the harness I ordered appears to be well made.

Boyd E Verified Purchase


May 1, 2024


Please note,'s personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Is this Trig TY91 unit backlit for night time operation?

Yes, the Trig TY91, part # 11-10721, is backlit for night time operation.

Q: Does this package include the TC90 remote control head, or must the TC90 be purchased separately?

Per the manufacturer installation manual, the TC 90 is included with the package.

Q: Is the intercom function built into the Trig Ty91 and is it always active? Does the intercom interrupt the radio transmission received?

Yes the TY91 does have an internal intercom if not used with an audio panel or intercom system. When using the internal intercom it is always on and the pilot and co-pilot can talkover a radio transmission.

Q: I have Bose A20 stereo headsets, will this Trig TY91 radio operate with these headsets or do I need a monaural headphones?

The BOSE A20 has the capability to switch between mono and stereo. so it will work with several radios.

Q: Which stand-alone GPS can I use to interface with this unit? (that features an RS232 out and is compatible with the Apollo SL40 protocol)

Please view Wiring Diagram 3 in the installation manual found in the documents section for a list of GPS units that will work with this radio.

Q: Does the system only option include connectors pins and backshells for the wiring harness?

Yes, it does.

Q: What are the lengths of the optional jacks? Are they appropriate for tandem aircraft?

The stock harnesses are pre-made at 4ft long, however you can order the custom length harness part # and we can make it to your custom lengths.

Q: Does the TY91 come with an antenna?

No, the TY91 does not include an antenna.

Q: Will this Trig TY91 work well with Lightspeed Delta Zulu headsets?

Yes, this will work with any brand headset. It comes with standard dual GA plugs.