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Last updated: 28 July 2021
Statuts:Enquête Officielle
Date:jeudi 12 juin 1980
Type/Sous-type:Silhouette image of generic SW4 model; specific model in this crash may look slightly different
Swearingen SA226-TC Metro II
Compagnie:Air Wisconsin
Immatriculation: N650S
Numéro de série: TC-228
Année de Fabrication: 1976
Heures de vol:8055
Moteurs: 2 Garrett TPE331-3VW-303G
Equipage:victimes: 2 / à bord: 2
Passagers:victimes: 11 / à bord: 13
Total:victimes: 13 / à bord: 15
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:ca 5 km N of Valley, NE (   Etats-Unis d'Amérique)
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Minneapolis-St. Paul International Airport, MN (MSP/KMSP), Etats-Unis d'Amérique
Aéroport de destination:Lincoln Municipal Airport, NE (LNK/KLNK), Etats-Unis d'Amérique
Numéro de vol: 965
Air Wisconsin Flight 965 departed Appleton, WI 12:45 arriving at Minneapolis at 14:02. The aircraft departed again at 14:20 for the last leg to Lincoln. Encountering moderate turbulence and moderate precipitation, the crew were cleared to leave the cruising altitude of 12,000 feet to 8,000 feet. At 15:36 Omaha Radar Approach Control cleared the flight down to 6,000 feet. Because turbulence was getting worse, and they were cleared for 4,000 and a little later to 3,000 feet.
While descending out of 6,000 feet massive water ingestion caused both engines to lose power simultaneously. Both engines were restarted, but the Metro couldn't recover and struck a muddy field in a slight nose down, right wing-down attitude. The aircraft bounced and hit the ground 288 feet further on. The plane skidded 1022 feet before coming to rest inverted.

Probable Cause:

PROBABLE CAUSE: "The flight crew's continued flight into an area of severe thunderstorms, and the resultant precipitation-induced flameout or loss of power of both engines at an altitude from which recovery could not be made. Contributing to the cause of the accident was the failure of the flight crew to utilise all available sources of weather information and the failure of the air traffic control system to disseminate critical weather information to the air traffic controllers and to the crew of Flight 965, the failure of air traffic control supervisory personnel to accomplish key job functions, and the failure of Center Weather Service Unit meteorologists to disseminate critical weather information to the Omaha Radar Approach Control Facility supervisors. Also contributing was the precipitation induced X-band radar attenuation which limited tile ability of airborne weather radar to detect the extent and intensity of the weather disturbances."

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 180 days (6 months)
Accident number: NTSB/AAR-80-15
Download report: Final report

» FAA-ASF-81-4
» NTSB Safety Recommendations A-81-23
» NTSB-AAR-80-15

Opérations de secours

NTSB issued 15 Safety Recommendations

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photo of Swearingen-SA226-TC-Metro-II-N650S
accident date: 12-06-1980
type: Swearingen SA226-TC Metro II
registration: N650S

Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Minneapolis-St. Paul International Airport, MN et Lincoln Municipal Airport, NE est de 529 km (331 miles).
Accident location: Exact; as reported in the official accident report.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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