Incident Overview

Date: Monday 8 May 1989
Aircraft Type: Beechcraft 99 Airliner
Owner/operator: Holmstr”m Flyg
Registration Number: SE-IZO
Location: near Oskarshamn Airport (OSK) – ÿ Sweden
Phase of Flight: Approach
Status: Destroyed, written off
Casualties: Fatalities: 16 / Occupants: 16
Component Affected: Aircraft structure (specifically the wing flaps and tail)Aircraft structure (specifically the wing flaps and tail)
Investigating Agency: SHKSHK
Category: Accident
A Beech 99 aircraft experienced a sudden and uncontrolled pitch-up, resulting in a steep dive to the left and a crash 150 meters short of the runway 19 threshold and left of the extended centerline. The aircraft’s center of gravity was significantly aft, exceeding the established aft limit, due to a substantial weight disparity between passengers. The pilot’s limited experience with the Beech 99 contributed to the situation, exacerbated by the rapid pitch-up triggered by the selected wing flaps while engines were running at high power. The crash was likely caused by a combination of factors, including the aircraft’s extreme tail-weight and inadequate pilot training.A Beech 99 aircraft experienced a sudden and uncontrolled pitch-up, resulting in a steep dive to the left and a crash 150 meters short of the runway 19 threshold and left of the extended centerline. The aircraft’s center of gravity was significantly aft, exceeding the established aft limit, due to a substantial weight disparity between passengers. The pilot’s limited experience with the Beech 99 contributed to the situation, exacerbated by the rapid pitch-up triggered by the selected wing flaps while engines were running at high power. The crash was likely caused by a combination of factors, including the aircraft’s extreme tail-weight and inadequate pilot training.

Description

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.

Primary Cause

Excessive tail weight and limited pilot experience on the Beech 99.Excessive tail weight and limited pilot experience on the Beech 99.

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