EASA Regulations for Diamond DA 20

Funkwerk Avionics (formerly Filser Electronic) TRT600 and TRT800 Series Transponders — Intermittent Loss of Detection, Insufficient Mode S Reply.

EASA Safety Information Bulletin 2008-84R1 addresses intermittent loss of detection and insufficient Mode S replies from Funkwerk Avionics TRT600 and TRT800 Series Transponders, including units formerly manufactured by Filser Electronic. These transponders are installed on various aircraft such as Cessna 150, 172, 182, 210, Diamond DA 20, Mooney M20J, Piper PA-28, and multiple sailplane models. The bulletin highlights issues affecting radar tracking and Mode S interrogation responses in European airspace.