No matter what aircraft you own, you can leave it to ASG for a hassle free service.
Call: (+44) 1481 265750

Avionic repairs, avionics upgrades and complete glass cockpits

ASG are the experts in avionic repairs, upgrades and complete glass cockpits


ASG are an official Garmin Dealer. We can supply and install the full range of the latest Garmin avionics all VAT free. Read more about our Garmin services. Read more about our Garmin services. Garmin Logo


Complete installations and support from Aspen dealers, ASG. Reliable solid-state sensors. Sharp, bright LCDs. Works with whatever’s in your panel. Read more about our Aspen services.

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ASG – Complete installations and support from STEC dealers and can cater for your every avionic requirement.   Stec avionics logo
Avionic Installations

Technological advancements never seem to cease, especially in the past 10 years. Most aircraft owners now have a number of options in terms of upgrades to their instrument panels and varying budgets, it can be quite a daunting task figuring out which package is right for you. Whether it is a single radio upgrade or you’re thinking about going to full glass cockpit let ASG guide you through your options so you can determine which upgrade is best for your aircraft and the best for your budget.

We have completed a large number of avionic installations, ranging from single unit upgrades to complete glass cockpit installations. You can view a small portrait of our work in our Project Showcase.

ASG are Garmin, Aspen and STEC dealers and can cater for your every avionic requirement. Of course, the biggest bonus with completing your instrument panel upgrade with us is that we do not charge VAT… We can also provide you with custom instrument panels (depending on aircraft type) that can be designed on screen, so you can gain an understand on how your aircraft instrument panel will look and feel well before you commit to choosing your package.

There are some great avionic manufacturers providing the latest and greatest in equipment and we are continuing to have great working relationships with these manufacturers, so we can provide you with post-installation support once your aircraft has rolled out, so you know how to drive your new units, rather than it driving you!

Aspen Avionics Evolution
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Avionic Repairs

Whether it’s a radio with some static interference or a weather radar failure, we have the knowledge and experience to cover every repair and defect that might pop up on your aircraft.

  •  Direct links with manufacturers and repair shops, reducing downtimes and costs.
  • Get one of our engineers to troubleshoot and determine the root cause of the problem, and then receive a free quotation so you know exactly what the costs are going to be, up front and honest.
  •  Complete manufacturer support. Whether you have a Bendix KX155 or Garmin G600, we have it covered.
  •  STEC, Garmin and Aspen Service Center.
  •  We don’t charge VAT

Avionic Inspections

Our aircraft would be useless if our instrument panel is faulty. We can provide a number of scheduled aircraft maintenance avionic inspections.

  • CAA/EASA LAMP Radio Annual Inspections.
  • FAA FAR 91 Transponder and Altimeter Inspections.
  • Software Upgrades.
  • Database subscriptions and updates.

aircraft cockpit with avionics

Are you Mode ‘S' compliant?

Within the next few years, airfields around the world will be upgrading their facilities to Mode ‘S’ transponder interrogation. A large number of general aviation aircraft are only Mode ‘C’ compliant. This is mainly aircraft with older transponders. There are some budget friendly upgrades available. Contact us to find out more.


  • King Air 90 owner
    King Air 90 owner
    I always choose ASG for handling in Guernsey, because they are very friendly, it feels like I’m coming home! Nothing is too much trouble and on the odd occasion my aircraft has maintenance issues whilst I’m there, the engineers are very quick to sort things out and get me on my way. Bravo ASG!
  • PA46 Malibu owner
    PA46 Malibu owner
    ASG are very experienced on all Piper models, they maintained my previous aircraft before I traded up to my latest Mirage. I always get clear, detailed reports on what work needs doing along with cost estimates, before I commit to the work being done, which gives me peace of mind and enables me to budget ahead.
  • Commander 114 owner
    Commander 114 owner
    ASG are easily the most experienced Commander maintenance company outside the USA. No wonder there are so many Commanders in their hangars when I visit them for maintenance – I simply would not trust anyone else with my aircraft, having used them for the last 5 annual inspections.
  • SR22T owner
    SR22T owner
    I flew my Cirrus from Europe to ASG in Guernsey to have the CAPS replaced because they have a good reputation for fast, efficient service. I was not disappointed as they completed the work in 2 days at a fixed price that I was very happy with.
  • SR22 owner
    SR22 owner
    I’ve had my Cirrus maintained by ASG for the past 4 years, since it was new and I’m always impressed with their detailed knowledge of the aircraft and it’s systems. ASG have really looked after me and my aircraft, which still looks as fresh as when it was built.


Please let us know how we can help you and we normally reply within 1 hour. You can also leave your telephone number and we would be happy to call you back. We are always interested to hear from fellow aviators.

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