B752, vicinity Keflavik Iceland, 2013

B752, vicinity Keflavik Iceland, 2013

Summary

On 26 February 2013, the crew of a Boeing 752 temporarily lost full control of their aircraft on a night auto-ILS approach at Keflavik when an un-commanded roll occurred during flap deployment after an earlier partial loss of normal hydraulic system pressure. The origin of the upset was found to have been a latent fatigue failure of a roll spoiler component, the effect of which had only become significant in the absence of normal hydraulic pressure and had been initially masked by autopilot authority until this was exceeded during flap deployment.

Description

On 26 February 2013, a Boeing 757-200 (TF-FIJ) being operated by Icelandair on a scheduled passenger flight from Copenhagen to Keflavik suddenly made an un-commanded roll left whilst on a night ILS approach at destination in VMC leading to a temporary loss of control and the declaration of an emergency. After recovery of control, a further approach was flown in abnormal configuration to an uneventful landing.

Investigation

An Investigation was carried out by the Icelandic Transportation Safety Board. The FDR and CVR were downloaded and the data from both were used to assist the Investigation. It was noted that both pilots were experienced on the aircraft type and, after establishing the nature of the loss of control and their response to it, comment on their performance was minimal and the Investigation was focussed on the airworthiness origin of the event.

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