Aeroplane Monthly 1988-02
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Erla 5A HB-SEX /Preservation Profile/
The Erla 5A flying as X-HB-SEX - a Swiss provisional Permit to Fly was granted in August 1968.
Erich Gandet’s recent photograph of the same aircraft in company with Roesgen EPR.301 HB-OIX, also based at Birrfeld.