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ASN Wikibase Occurrence # 32338
Last updated: 6 January 2022
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Time:15:31 LT
Type:Silhouette image of generic MU2 model; specific model in this crash may look slightly different
Mitsubishi MU-2B-60 Marquise
Owner/operator:Air Material/Air Engiadina AG
Registration: HB-LLP
MSN: 767SA
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Urnäsch, Canton of Appenzell Ausserrhoden -   Switzerland
Phase: En route
Departure airport:Basel/Mulhouse (BSL/LFSB)
Destination airport:Zürich-Kloten (ZRH/LSZH)
On September 3 1994, During Section D of a maintenance test flight, which called for the shutting down and restarting of each of the aircraft's engines in turn, and while flying at FL 130, the aircraft suddenly went out of control. Control was not regained and the aircraft crashed in woods near Urnäsch, Canton of Appenzell Ausserrhoden, Switzerland.

At the start of the test, when the pilot shut down the right engine, the aircraft lost speed and height and went off course. The pilot restarted the engine and recovered the situation. He then advised that he was going to shut down the right engine again. Shortly after this the aircraft began to turn to the right and lose height. The loss of control resulted from the 'extreme asymmetric thrust' due to the right propeller windmilling at high speed.

The pilot (the sole person on board) was killed by the impact forces of the crash.



Accident investigation:
Investigating agency: 
Status: Investigation completed
Download report: Final report
Other occurrences involving this aircraft

14 Oct 1984 HB-LLP Fly-Yourself AG 0 Lugano - LSZA min


Photo of HB-LLP courtesy

Helsinki - Vantaa (EFHK / HEL)
31 May 1987; (c) Pertti Sipilä

Revision history:

27-Sep-2008 01:00 ASN archive Added
27-Nov-2010 10:31 Alpine Flight Updated [Time, Other fatalities, Location, Phase, Nature, Departure airport, Destination airport, Source, Damage, Narrative]
11-Sep-2013 16:54 wf Updated [Operator, Departure airport, Destination airport, Source, Narrative]
06-Mar-2016 19:51 Dr.John Smith Updated [Operator, Location, Nature, Source, Narrative]
07-Dec-2016 23:26 wf Updated [Narrative]

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