Accident
Last updated: 17 April 2014
Status:Definitief
Datum:zaterdag 5 december 1987
Tijd:09:55
Type:Silhouette image of generic B732 model; specific model in this crash may look slightly different
Boeing 737-2B7
Luchtvaartmaatschappij:USAir
Registratie: N319AU
Constructienummer: 22887/976
Bouwjaar: 1983-06-24 (4 years 6 months)
Aantal vlieguren:12845
Motoren: 2 Pratt & Whitney JT8D-15A
Bemanning:slachtoffers: 0 / inzittenden: 5
Passagiers:slachtoffers: 0 / inzittenden: 62
Totaal:slachtoffers: 0 / inzittenden: 67
Schade: Groot
Gevolgen: Repaired
Plaats:Deptford, NJ (   Verenigde Staten)
Fase: Kruisvlucht (ENR)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Philadelphia International Airport, PA (PHL/KPHL), Verenigde Staten
Vliegveld van aankomst:Boston-Logan International Airport, MA (BOS/KBOS), Verenigde Staten
Vluchtnummer: 224
Beschrijving:
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 nr. 2 throttle slam and lock to the idle position. A continuous airframe buffet began. Soon thereafter, the nr. 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 nr. 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: "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."

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


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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Philadelphia International Airport, PA en Boston-Logan International Airport, MA bedraagt 447 km (279 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkĺs opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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