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Last updated: 6 December 2021
Statuts:Enquête Officielle
Date:lundi 23 septembre 1985
Heure:10:20
Type/Sous-type:Silhouette image of generic BE99 model; specific model in this crash may look slightly different
Beechcraft B99 Airliner
Compagnie:Henson Airlines
Immatriculation: N339HA
Numéro de série: U-156
Année de Fabrication: 1974
Moteurs: 2 Pratt & Whitney Canada PT6A-27
Equipage:victimes: 2 / à bord: 2
Passagers:victimes: 12 / à bord: 12
Total:victimes: 14 / à bord: 14
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:11 km (6.9 milles) ESE of Staunton-Shenandoah Valley Airport, VA (SHD) (   Etats-Unis d'Amérique)
Élévation des lieux de l'accident: 732 m (2402 feet) amsl
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Baltimore/Washington International Airport, MD (BWI/KBWI), Etats-Unis d'Amérique
Aéroport de destination:Staunton-Shenandoah Valley Airport, VA (SHD/KSHD), Etats-Unis d'Amérique
Numéro de vol:1517
Détails:
The crew, cleared for a runway 04 ILS approach, became uncertain of their position. The aircraft struck the southwest face of Hall Mountain at an elevation of 2,400 feet.
Radio equipment installed on the aircraft was non standard (and non FAA approved). The ADF and 2 NAV displays were in an unsuitable location for the first-officer.

Probable Cause:

PROBABLE CAUSE:
The National Transportation Safety Board determines that the probable cause of this accident was a navigational error by the flightcrew resulting from their use of the incorrect navigational facility and their failure to adequately monitor the flight instruments.
Factors which contributed to the flightcrew's errors were:
- the nonstandardized navigational radio systems installed in the airline's Beech 99 fleet;
- intracockpit corhmunications difficulties associated with high ambient noise levels in the airplane;
- inadequate training of the pilots by the airline;
- the first officer's limited multiengine and instrument flying experience;
- the pilots' limited experience in their positions in the Beech 99;
- and stress-inducing events in the lives of the pilots.
Also contributing to the accident was the inadequate surveillance of the airline by the Federal Aviation Administration which failed to detect the deficiencies which led to the accident.

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year
Accident number: NTSB/AAR-86-07
Download report: Final report

Sources:
» Lloyds List
» NTSB
» NTSB Safety Recommendations A-86-98 through -118


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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 Baltimore/Washington International Airport, MD et Staunton-Shenandoah Valley Airport, VA est de 217 km (135 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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Beech 99

  • 239 built
  • 24ème loss
  • 14ème accident fatal
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