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Last updated: 22 October 2019
Statuts:Enquête Officielle
Date:samedi 3 mars 2001
Heure:09:55
Type/Sous-type:Silhouette image of generic SH36 model; specific model in this crash may look slightly different
Shorts C-23B+ Sherpa (330)
Compagnie:Florida Army National Guard
Immatriculation: 93-1336
Numéro de série: SH.3420
Année de Fabrication: 1985
Moteurs: 2 Pratt & Whitney Canada PT6A-65AR
Equipage:victimes: 3 / à bord: 3
Passagers:victimes: 18 / à bord: 18
Total:victimes: 21 / à bord: 21
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:près de Unadilla, GA (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Militaire
Aéroport de départ:Hurlburt Field, FL (KHRT), Etats-Unis d'Amérique
Aéroport de destination:Oceana NAS, VA (NTU/KNTU), Etats-Unis d'Amérique
Numéro de vol:PAT528
Détails:
Crashed and burst into flames in a farm field in heavy rain. All of the passengers were members of a Virginia-based military construction and engineering crew on a routine training mission. The plane's pilot and two other crew members were members of the 171st Aviation Regiment of the Florida Army National Guard
It appeared that the pilot's decision to go to the bathroom shifted the weight of the already unbalanced plane and caused it to become unstable and uncontrollable while in an area of strong turbulence. The nose of the plane slowly pitched up and then abruptly dropped just before the crash. In three seconds, the plane rose more than 100 feet with its nose down, and was then rocked by wind shear three times greater than what is defined as extreme turbulence. Within the first 12 seconds that they encountered problems, the G-force shifts rendered the crew and passengers incapacitated and unconscious and caused the breakup of the aircraft in flight. It was also established that the weather radar was underpowered, negatively impacting the ability of the crew to successfully circumnavigate around the severe weather.
This C-23B Sherpa was originally built as a Shorts 360 (SH-3684) in December 1985 and was delivered to Simmons Airlines as N374MQ In 1998 the aircraft was converted to a Sherpa C-23B.

Probable Cause:

PROBABLE CAUSE: "The Collateral Investigation Board found the preponderance of the evidence concluded that the aircraft accident was due to crew error. The board found other factors present but not contributing directly to this aircraft accident. These factors may have influenced the crew's decision making process and aircraft performance. This is normally the case in most aircraft human factor accidents. The board did find the preponderance of the evidence directed the board toward the crew's failure to properly load the aircraft. In particular, the crew's failure to properly manage the weight and balance of the aircraft resulted in an 'out-of-CG' condition that exceeded the aircraft design limits, rendering the aircraft unstable and leading to a violent departure from controlled flight. Once the aircraft departed controlled flight, the rapid onset of significant G-force shifts rendered the crew and passengers incapacitated and unconscious and led to a structural break-up of the aircraft in flight. This ultimately resulted in the aircraft impacting the ground, killing all on board."

Sources:
» Pete Whybrow
» St. Petersburg Times


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Plan
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 Hurlburt Field, FL et Oceana NAS, VA est de 1207 km (754 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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Shorts 360

  • 172 built
  • 11ème loss
  • 4ème accident fatal
  • le accident 2ème le plus grave (à ce moment là)
  • le accident 3ème le plus grave (en ce moment)
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