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Accident
Last updated: 11 December 2017
Statuts:Enquête Officielle
Date:samedi 5 décembre 1987
Heure:09:55
Type/Sous-type:Silhouette image of generic B732 model; specific model in this crash may look slightly different
Boeing 737-2B7
Compagnie:USAir
Immatriculation: N319AU
Numéro de série: 22887/976
Année de Fabrication: 1983-06-24 (4 years 6 months)
Heures de vol:12845
Moteurs: 2 Pratt & Whitney JT8D-15A
Equipage:victimes: 0 / à bord: 5
Passagers:victimes: 0 / à bord: 62
Total:victimes: 0 / à bord: 67
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Deptford, NJ (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Philadelphia International Airport, PA (PHL/KPHL), Etats-Unis d'Amérique
Aéroport de destination:Boston-Logan International Airport, MA (BOS/KBOS), Etats-Unis d'Amérique
Numéro de vol: 224
Détails:
USAir Flight 224 departed Philadelphia on a scheduled flight to Boston. While climbing through 4000 feet, the aircraft yawed and rolled to the right. Simultaneously, the crew noticed the no. 2 throttle slam and lock to the idle position. A continuous airframe buffet began. Soon thereafter, the no. 2 engine separated from the aircraft and the buffet stopped. The engine impacted in an open field, 6 miles from the airport. After separation, the 'B' hydraulic system lost pressure and the flaps would only extend to 10 deg. The aircraft was landed safely after an emergency gear extension and differential braking was used for steering. It appeared that the aft mount cone bolt for the no. 2 engine had failed from fatigue through the thread relief undercut radius. Fatigue cracks had initiated on diametrically opposite sides of the radius. Subsequently, the forward mount cone bolts and secondary support cable failed from overload.

Probable Cause:

PROBABLE CAUSE: "Previous damage to the aft cone (engine mounting) bolt, which resulted in mismatched surfaces between the bolt and isolation mount, loss of torque during cyclic loading of the mounting bolt, and subsequent fatigue failure of the bolt."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 3 months
Accident number: NYC88FA050
Download report: Summary report

Sources:
» Aviation Week & Space Technology 30 Jan. 1989 (p.71)
» NTSB


Opérations de secours

NTSB issued 2 Safety Recommendations

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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 Philadelphia International Airport, PA et Boston-Logan International Airport, MA est de 447 km (279 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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