Crash-aerien 15 DEC 1985 d'un Boeing 747-136 G-AWNE - Boston-Logan International Airport, MA (BOS)

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Statuts:	Accident investigation report completed and information captured
Date:	dimanche 15 d�cembre 1985
Heure:	14:50
Type/Sous-type:	Boeing 747-136
Compagnie:	British Airways
Immatriculation:	G-AWNE
Numéro de série:	19765/109
Année de Fabrication:	1971
Heures de vol:	55667
Equipage:	victimes: 0 / à bord: 17
Passagers:	victimes: 0 / à bord: 252
Total:	victimes: 0 / à bord: 269
Dégats de l'appareil:	Substantiels
Conséquences:	Repaired
Lieu de l'accident:	Boston-Logan International Airport, MA (BOS) ( Etats-Unis d'Amérique)
Phase de vol:	En approche (APR)
Nature:	Transport de Passagers Intern.
Aéroport de départ:	London-Heathrow Airport (LHR/EGLL), Royaume Uni
Aéroport de destination:	Boston-Logan International Airport, MA (BOS/KBOS), Etats-Unis d'Amérique
Numéro de vol:	BA215

Détails:
Approximately 16 ft of the left inboard trailing edge flap separated while the aircraft was on final approach to land at Boston-Logan Airport. The approach and landing were completed without further incident. Investigation revealed 5 of the 8 bolts which hold the no. 3 flap track forward attach fitting to the wing showed signs of fatigue and the 3 remaining bolts showed overload type failures. No inspection requirements for the forward attachment bolts were required by Boeing at the time of the accident.

Probable Cause:

PROBABLE CAUSE:
flight control,flap attachment..fatigue

CONTRIBUTING FACTORS:
flight control,flap attachment..failure,partial
acft/equip,inadequate airframe..manufacturer
insufficient standards/requirements,manufacturer..manufacturer
maintenance..inadequate..manufacturer
maintenance,inspection..inadequate..manufacturer

Accident investigation:

Investigating agency:	NTSB
Status:	Investigation completed
Duration:	1 year and 7 months
Accident number:	NTSB/AAR-87/02/SUM
Download report:	Summary report

Sources:

» NTSB

Opérations de secours

NTSB issued 3 Safety Recommendations

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Photos

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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 London-Heathrow Airport et Boston-Logan International Airport, MA est de 5201 km (3251 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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Issued: 09-JAN-1986	To: FAA	A-86-1
ISSUE AN AIRWORTHINESS DIRECTIVE TO REQUIRE AN IMMEDIATE INSPECTION OF ALL BOEING 747 AIRPLANES HAVING AN APPROPRIATE MINIMUM NUMBER OF OPERATING CYCLES TO VERIFY THAT ALL BOLTS FOR THE NOS. 1 THROUGH 3 AND NOS. 6 THROUGH 8 FLAP TRACK FORWARD ATACHMENT FITTINGS ARE TORQUED ADEQUATELY. IF ANY OF THE BOLTS ARE BROKEN OR ARE NOT TORQUED ADEQUATELY, ALL OF THE BOLTS FROM THE FORWARD ATTACHMENT FITTING WITH THE BROKEN OR UNDERTORQUED BOLT SHOULD BE REMOVED AND INSPECTED BY AN FAA-APPROVED METHOD AND THE BOLTS FOR THE OTHER ATTACHMENTS OF THE AFFECTED FLAP TRACK SHOULD BE INSPECTED FOR ADEQUATE TORQUE BEFORE FURTHER FLIGHT. (Closed - Acceptable Action)
Issued: 09-JAN-1986	To: FAA	A-86-2
BASED ON INFORMATION GAINED BY THE INSPECTION PROGRAM DETAILED IN SAFETY RECOMMENDATION A-86-1, DETERMINE AN APPROPRIATE INTERVAL FOR CHECKING THE BOLT TORQUE, AND DEFINE PERIODIC REINSPECTION REQUIREMENTS IN AN AIRWORTHINESS DIRECTIVE. (Closed - Acceptable Action)
Issued: 09-JAN-1986	To: FAA	A-86-3
NOTIFY FOREIGN GOVERNMENTS WITH OPERATORS OF BOEING 747 AIRPLANES OF THE CIRCUMSTANCES OF THE ACCIDENT INVOLVING THE BRITISH AIRWAYS BOEING 747-136 ON DECEMBER 15, 1985, IN BOSTON, MASSACHUSETTS, AND OF ANY ACTION TAKEN AS A RESULT OF THE ACCIDENT. (Closed - Acceptable Action)