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Accident
Last updated: 23 October 2017
Status:Definitief
Datum:woensdag 31 maart 1993
Tijd:12:34
Type:Silhouette image of generic B741 model; specific model in this crash may look slightly different
Boeing 747-121
Vloog voor:Japan Air Lines - JAL
Gehuurd van:Evergreen International Airlines
Registratie: N473EV
Constructienummer: 19657/37
Bouwjaar: 1970-04-15 (23 years)
Aantal vlieguren:83906
Aantal vluchten:18387
Motoren: 4 Pratt & Whitney JT9D-7D
Bemanning:slachtoffers: 0 / inzittenden: 3
Passagiers:slachtoffers: 0 / inzittenden: 0
Totaal:slachtoffers: 0 / inzittenden: 3
Schade: Groot
Gevolgen: Repaired
Plaats:Anchorage International Airport, AK (ANC) (   Verenigde Staten)
Fase: InitiŽle klim (ICL)
Soort vlucht:Vracht
Vliegveld van vertrek:Anchorage International Airport, AK (ANC/PANC), Verenigde Staten
Vliegveld van aankomst:Chicago-O'Hare International Airport, IL (ORD/KORD), Verenigde Staten
Vluchtnummer:JL46E
Beschrijving:
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

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


Veiligheidsmaatregelen

NTSB issued 10 Safety Recommendations

Show all AD's and Safety Recommendations

Foto's

photo of Boeing 747-121 N473EV
photo of Boeing 747-121 N473EV
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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 Anchorage International Airport, AK en Chicago-O'Hare International Airport, IL bedraagt 4534 km (2834 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkís 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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