SB20, Unalaska AK USA, 2019

SB20, Unalaska AK USA, 2019

Summary

On 17 October 2019, a Saab 2000 overran the Unalaska runway after touchdown following difficulty braking and exited the airport perimeter before finally coming to rest on shoreline rocks. The Investigation attributed the poor braking to incorrect brake system wiring originating during maintenance some 2½ years earlier but noted the touchdown occurred with crew awareness that the prevailing tailwind component was well in excess of the permitted limits with no reason not to use the into-wind runway and attributed this to plan continuation bias. The aircraft operator’s failure to apply their specifically-applicable airport qualification requirements to the Captain was noted.

Description

On 17 October 2019, a Saab 2000 (N686PA) being operated on a domestic passenger flight from Anchorage to Unalaska as PenAir flight 3296 overran the destination runway after touching down on destination runway 13 in the presence of a significant tailwind component following its second approach there in day VMC. The aircraft sustained substantial damage and one of the 42 occupants, a passenger, was killed. Nine other passengers were injured, one of them seriously. 

The aircraft in its final resting position. [Reproduced from the Official Report]

Investigation

An Investigation into the accident was carried out by the NTSB. The FDR and CVR were located and recovered and data from both were successfully downloaded and of assistance to the Investigation. Part of the overrun was also recorded on two off-airport security cameras.

The Flight Crew

The 56 year-old Captain was recorded as having accumulated a total of 14,761 flying hours experience which included 11,811 hours in command, most of the later being acquired whilst working for another Alaska regional airline which had ceased operations two years earlier. However, only 131 of these hours had been flying the Saab 2000, on which he had completed conversion training and been authorised to operate in command three months prior to the accident. Since completing his line training, he had operated into Unalaska four times in command having previously done so five times under supervision.

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