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2021/07

Report concerning the air accident in Follebu, Gausdal municipality, Innlandet county, Norway on 1 August 2019 involving Hughes Helicopters Inc. 369D, SE-JVJ operated by First European Aviation Company Sp. z.o.o.

The helicopter carried out line inspection using laser scanning and aerial photography. Approximately 52 minutes into the flight the commander became aware of abnormal vibrations in the helicopter. The vibrations increased in intensity and the commander decided to make an emergency landing on a field. During the last phase of the approach, for approx. 3 meter altitude, the crew heard a bang and the helicopter lost all power. The commander lost control of the helicopter which landed hard. The right skid collapsed, the horizontal stabiliser, and all five main rotor blades were in contact with the ground and were substantially damaged. The crew was uninjured. The powerloss was caused by a fracture in the main gearbox input pinion. The pinion fracture was caused by fatigue. It has not been possible to determine what caused the fatigue.

Regardless of the cause, the NSIA is of the opinion that some of the maintenance work on the main gearbox had not been performed in accordance with the expected standard. Moreover, the NSIA finds that the continuing airworthiness  management and the submitted maintenance documentation were inadequate.

Published 23.06.2021

Facts

Location Follebu, Gausdal municipality, Norway
Occurrence date 01.08.2019
Aircraft McDonnell Douglas MD-369
Operator First European Aviation Company Sp. (FEAC), Poland
Registration SE-JVJ
Meteorological conditions VMC
County Innlandet
Type of occurrence Accident
Type of operation Commercial, other
Category of operation Light, helicopter (<= 2 250kg)
Aircraft category Helicopter, Single-engine, Turboprop/turboshaft
FIR/AOR ENOS (Oslo ATCC)