Accident Beechcraft 99 Airliner SE-IZO, Monday 8 May 1989
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Date:Monday 8 May 1989
Type:Silhouette image of generic BE99 model; specific model in this crash may look slightly different    
Beechcraft 99 Airliner
Owner/operator:Holmström Flyg
Registration: SE-IZO
MSN: U-48
Year of manufacture:1968
Total airframe hrs:23095 hours
Engine model:Pratt & Whitney Canada PT6A-28
Fatalities:Fatalities: 16 / Occupants: 16
Other fatalities:0
Aircraft damage: Destroyed, written off
Location:near Oskarshamn Airport (OSK) -   Sweden
Phase: Approach
Nature:Passenger - Scheduled
Departure airport:Stockholm-Arlanda Airport (ARN/ESSA)
Destination airport:Oskarshamn Airport (OSK/ESMO)
Investigating agency: SHK
Confidence Rating: Accident investigation report completed and information captured
The Beech 99 was on short finals when it suddenly pitched up. It entered a steep dive to the left and crashed 150 m short of the runway 19 threshold and left of the extended centreline. The centre of gravity was too far aft (45,0 % MAC whereas the aft limit was 38.4%) due to weight disparity between passengers.
The first officer, who was Pilot Flying on the accident flight, had limited experience on the Beech 99 (28 hours).

Probable cause:
The accident was probably caused by the fact that the pilot could not compensate for the rapid pitch-up that occurred when the wing flaps were selected out while the engines were running at high power.
Contributing factors have been:
* The aircraft was extremely tail-heavy.
* The crew's training and overall experience on the aircraft type was limited.

Accident investigation:
Investigating agency: SHK
Report number: C1990:12
Status: Investigation completed
Duration: 9 months
Download report: Final report


ICAO Adrep Summary 4/89 (#61)


  • 34th worst accident in 1989
  • 2nd worst accident of this aircraft type
  • 2nd worst accident of this aircraft type at the time



photo (c) Rolf Larsson; Stockholm-Arlanda Airport (ARN); 26 April 1988

Revision history:


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