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Accident
Last updated: 17 October 2017
Statuts:Enquête Officielle
Date:mercredi 31 mars 1993
Heure:12:34
Type/Sous-type:Silhouette image of generic B741 model; specific model in this crash may look slightly different
Boeing 747-121
Opérant pour:Japan Air Lines - JAL
Loué à :Evergreen International Airlines
Immatriculation: N473EV
Numéro de série: 19657/37
Année de Fabrication: 1970-04-15 (23 years)
Heures de vol:83906
Cycles:18387
Moteurs: 4 Pratt & Whitney JT9D-7D
Equipage:victimes: 0 / à bord: 3
Passagers:victimes: 0 / à bord: 0
Total:victimes: 0 / à bord: 3
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Anchorage International Airport, AK (ANC) (   Etats-Unis d'Amérique)
Phase de vol: En montée initiale (ICL)
Nature:Cargo
Aéroport de départ:Anchorage International Airport, AK (ANC/PANC), Etats-Unis d'Amérique
Aéroport de destination:Chicago-O'Hare International Airport, IL (ORD/KORD), Etats-Unis d'Amérique
Numéro de vol:JL46E
Détails:
JAL Flight 46E departed Anchorage about 12:24 local time. The flight release/weather package provided to the pilots by Evergreen operations contained a forecast for severe turbulence and indicated that severe turbulence was reported by other large airplanes. As flight 46E taxied onto the runway to await its takeoff clearance, the local controller informed "the flightcrew that the pilot of another
Evergreen B-747 reported severe turbulence at 2,500 feet while climbing out from runway 06R.
After takeoff, at an altitude of about 2,000 feet, the airplane experienced an uncommanded left bank of approximately 50 degrees. While the desired air speed was 183 knots, the air speed fluctuated about 75 knots from a high of 245 knots to a low of 170 knots. Shortly thereafter, the flightcrew reported a "huge" yaw, the No. 2 throttle slammed to its aft stop, the No. 2 reverser indication showed thrust reverser deployment, and the No. 2 engine electrical bus failed. Several witnesses on the ground reported that the airplane experienced several severe pitch and roll oscillations before the engine separated. Shortly after the engine separated from the airplane, the flightcrew declared an emergency, and the captain initiated a large radius turn to the left to return and land on runway 06R. The No. 1 engine was maintained at
emergency/maximum power. While on the downwind portion of the landing pattern, bank angles momentarily exceeded 48 degrees, alternating with wings level. About 12:45, flight 46E advised the tower that they were on the runway.

Probable Cause:

PROBABLE CAUSE: "The lateral separation of the No. 2 engine pylon due to an encounter with severe or possibly extreme turbulence that resulted in dynamic multi-axis lateral loadings that exceeded the ultimate Iateral load-carrying capability of the pylon, which was already reduced by the presence of the fatigue crack near the forward end of the pylon's forward firewall web."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 196 days (7 months)
Accident number: NTSB/AAR-93/06
Download report: Final report

Sources:
» Air Safety Week 7:14 5.4.1993 (5)
» NTSB Safety Recommendations A-94-9 and -10
» NTSB/AAR-93/06


Opérations de secours

NTSB issued 10 Safety Recommendations

Show all AD's and Safety Recommendations

Photos

photo of Boeing 747-121 N473EV
photo of Boeing 747-121 N473EV
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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 Anchorage International Airport, AK et Chicago-O'Hare International Airport, IL est de 4534 km (2834 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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