C560, vicinity Oslo Norway, 2017

C560, vicinity Oslo Norway, 2017

Summary

On 11 January 2017, control of a Cessna Citation 560 departing Oslo on a short positioning flight was lost control during flap retraction when a violent nose-down manoeuvre occurred. The First Officer took control when the Captain did not react and recovered with a 6 g pullout which left only 170 feet of ground clearance. A MAYDAY - subsequently cancelled when control was regained - was declared and the intended flight was then completed without further event. The Investigation concluded that tailplane stall after the aircraft was not de-iced prior to departure was the probable cause of the upset.

Description

On 11 January 2017, a Cessna Citation 560 (LN-IDB) being operated by air taxi company Hesnes Air on a non revenue positioning flight from Oslo to the company base at Sandefjord/Torp as HSG03 experienced an uncommanded sudden and violent nose-down manoeuvre in day IMC. A MAYDAY was declared as recovery was achieved with minimal terrain clearance but it was cancelled after full control was regained and the intended flight was completed without further event. Structural damage to the aircraft was subsequently found to be so severe that it was declared a hull loss.

Investigation

An Investigation was carried out by the Accident Investigation Board Norway (AIBN) after the event was notified the same day by the Gardermoen TWR Supervisor. The CVR and 2 hour FDR were removed from the aircraft and their available data were successfully downloaded. However, it was noted that “unlike most FDRs it did not register the control surface and yoke positions, which would have been highly beneficial in this Investigation”.

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