• Company



• Founded in May 1988 by Hubert Sonderegger (his one-man business was turned into a joint-stock company) and Hansjörg Walker, Andy Stoll and Hansruedi Hug (formerly working together for Limess Aviation Ltd.)

• On 1st August 1989 we relocated the repair workshop/office to larger premises at the 4th floor of the GAC at Zurich-Airport

• In 1990 Hansjörg Walker left the company 

• In 1993 we received JAA Part 145 approval 

• In June 1995 Michel Däppen joined our team

• On 1st January 2003 we took over the instrument workshop of Zimex Aviation with Ernst Keller as specialist and manager

• In February 2006 Hubert Sonderegger retired, after a long and successful career, and Esther Surber (the company's long-standing administrator) joined the board

• On 1st December 2006 we received our EASA Approval as a Maintenance Organisation (No. CH.145.0181)

• On 6th August 2007 we were assigned as an EASA Alternative Design Organisation (No. EASA.AP.261)

• On 1st February 2016 we opened our branch at Grenchen Regional Airport

• On 6th September 2017 we received the approval as an FAA Repair Station (No. 872Y074D)


History and Development 

The company was founded after a market study which showed that owners of small to mid-sized airplanes at Zurich airport and the nearby airfields were in need of an independent avionics shop.

During the first years we mainly carried out checks and bench repair of avionics equipment and only a few installation works. The majority of the activities was performed at Zurich airport and little at Birrfeld and other airfields.

Little by little we spread our activities as far as the French speaking part of Switzerland, namely Ecuvillens, and other smaller airfields throughout Switzerland. This and the fact that Zurich-Airport became unattractive to GA aircraft owner (lots of restrictions) led to the opening of our branch at Grenchen Regional Airport.

Gradually our activities changed to such a degree that today we perform well over 80 % installations on aircraft A1, A2, and helicopters A3 and relatively few repairs, one of the reasons being that fact that the newer generation of digital avionics systemes is not field repairable anymore. But until today we are glad to have our experienced instrument technician Ernst Keller to test, repair and calibrate the older analog instruments as well as the modern digital instrument systems.

Moreover, since Switzerland joined EASA, certification became very important and so we became experts in Aircraft Design and Certifications for GA Avionics Modification.


  • Testbench Zurich-Airport

  • Hangar Grenchen