Accident Beechcraft 99 Airliner SE-IZO, Monday 8 May 1989

Date:	Monday 8 May 1989
Time:	09:38
Type:	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
Category:	Accident
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

Narrative:
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: