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2016/02 eng

Report on serious incident near Klanten airfield, Norway on 26 May 2015 with Alexander Schleicher GmbH & Co Segelflugzeugbau ASK 21 Mi, LN-GMI

The pilot was on a flight from Otrøvatnet to Klanten when he got a low engine oil warning. A check of the engine installation after landing revealed a crack in the exhaust system. This has led to heat damages and signs of fire.

The investigation has shown that it can be difficult to detect cracks in the exhaust system. To make it easier to identify this safety issue, operators must be given relevant information about the signs of an incipient crack. AIBN has issued a safety recommendation to the manufacturer about this.

Safety recommendation

Safety recommendation SL No. 2016/01T

Cracks in the exhaust silencer of Alexander Schleicher GmbH & Co Segelflugzeugbau ASK 21 Mi aircraft can cause heat damage and possible fire in the engine compartment. In the opinion of the Accident Investigation Board Norway, this has not been sufficiently covered and emphasised in the aircraft's flight manual, maintenance programme or other official information from the glider manufacturer.

The Accident Investigation Board Norway therefore recommends that Alexander Schleicher GmbH & Co Segelflugzeugbau makes public relevant information so that users of ASK 21 Mi can be advised on how to detect leaks in the exhaust silencer at an early stage.


Location Near Klanten airfield, Norway (ENKL)
Occurrence date 26.05.2015
ICAO Location indicator ENKL
Aircraft Øvrige motorglidere
Registration LN-GMI
Meteorological conditions VMC
County Telemark
Type of occurrence Serious incident
Type of operation Private (club)
Category of operation Light, aeroplane (< 5 700kg)
Aircraft category Sailplane (incl. motorglider), Single-engine

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