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Last updated: 3 December 2021
Statuts:Enquête Officielle
Date:mercredi 23 juin 1976
Heure:17:12
Type/Sous-type:Silhouette image of generic DC93 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-31
Compagnie:Allegheny Airlines
Immatriculation: N994VJ
Numéro de série: 47333/481
Année de Fabrication: 1969
Heures de vol:21320
Moteurs: 2 Pratt & Whitney JT8D-7A
Equipage:victimes: 0 / à bord: 4
Passagers:victimes: 0 / à bord: 102
Total:victimes: 0 / à bord: 106
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Philadelphia International Airport, PA (PHL) (   Etats-Unis d'Amérique)
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Windsor Locks-Bradley International Airport, CT (BDL/KBDL), Etats-Unis d'Amérique
Aéroport de destination:Philadelphia International Airport, PA (PHL/KPHL), Etats-Unis d'Amérique
Numéro de vol: 121
Détails:
Allegheny Airlines Flight 121, a Douglas DC-9-31, suffered a landing accident on the Philadelphia International Airport, Pennsylvania. Of the 106 persons onboard, 86 persons were injured; there were no fatalities.
The captain of Flight 121 had conducted an instrument approach to runway 27R in visual conditions as a thunderstorm passed over the airport in a north-northeasterly direction. When near the threshold the captain initiated a go-around from a low altitude and entered rain of increasing intensity. Shortly thereafter the aircraft was seen descending in a noseup attitude with the landing gear retracted. After striking tail first on a taxiway about 4,000 feet beyond the threshold of runway 27, the aircraft slid about 2,000 feet and stopped. The wreckage came to rest about 6000 feet beyond the threshold and about 350 feet to the right of the centerline of runway 27R.

Probable Cause:

PROBABLE CAUSE: "The aircraft's encounter with severe horizontal and vertical wind shears near the ground as a result of the captain's continued approach into a clearly marginal severe weather condition. The aircraft's ability to cope under these conditions was borderline when flown according to standard operating procedures; however, if the aircraft's full aerodynamic and power capability had been used, the wind shear could probably have been flown through successfully. Contributing to the accident was the tower controller's failure to provide timely below-minimum RVR information."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 7 months
Accident number: NTSB/AAR-78-02
Download report: Final report

Sources:
» ICAO Circular 146-AN/96 (148-161)
» NTSB-AAR-78-2


Opérations de secours

NTSB issued 1 Safety Recommendation

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Photos

photo of DC-9-31-N994VJ
accident date: 23-06-1976
type: McDonnell Douglas DC-9-31
registration: N994VJ
photo of DC-9-31-N994VJ
accident date: 23-06-1976
type: McDonnell Douglas DC-9-31
registration: N994VJ
 

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 Windsor Locks-Bradley International Airport, CT et Philadelphia International Airport, PA est de 312 km (195 miles).

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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DC-9-30

  • 662 built
  • 20ème loss
» safety profile