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ASN Wikibase Occurrence # 180868
Last updated: 24 May 2020
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Time:22:19 UTC
Type:Silhouette image of generic ATP model; specific model in this crash may look slightly different
British Aerospace ATP
Owner/operator:West Air Sweden
Registration: SE-MAF
C/n / msn: 2002
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: None
Category:Serious incident
Location:Approx. 20nm NNE of Lillehammer -   Norway
Phase: En route
Departure airport:Oslo
Destination airport:Trondheim
Investigating agency: AIBN
The problems started with a loss of airspeed in icing conditions. The crew activated the aircraft's system for de-icing, however, the speed continued to drop. Suddenly the aircraft started buffeting and made uncontrolled attitude changes. The crew disconnected the autopilot, picked up speed in a descent and regained control. The cruising flight level was reduced by 2000 ft, and the ice disappeared. The loss of altitude was not critical in relation to terrain.

The flight continued to the destination without further problems.

Findings made during the investigation indicate that the loss of speed was caused by a combination of icing and mountain waves. The airspeed dropped below the recommended speed in icing conditions, and the plane was about to stall. The phenomenon was well known before this incident occurred, and was described in Aircraft Flight Manual as well as in other documentation. Despite this, the investigation revealed shortcomings in the Operatorís knowledge in this area. A potential for improvement in documentation from the type certificate holder was also identified.


Accident investigation:
Investigating agency: AIBN
Status: Investigation completed
Download report: Final report

Revision history:

01-Nov-2015 12:53 Aerossurance Added
01-Nov-2015 12:55 Aerossurance Updated [Aircraft type]

Corrections or additions? ... Edit this accident description