Q.C.M. design GmbH is an EASA approved Part 21 Design Organisation.
The company is entitled to design and certify Minor and Major Changes (STC) to aircrafts and helicopters, specialised in the field of Avionics Modifications, Cabin Interior Modifications and the Structural Changes involved.
Q.C.M. was established by Markus Enck and Britta Zwahlen in the year 2000 in Belp, Switzerland.
See more at: https://www.qcm.ch/