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Statuts:Enquête Officielle
Date:jeudi 2 février 2006
Type/Sous-type:Silhouette image of generic B744 model; specific model in this crash may look slightly different
Boeing 747-422
Compagnie:United Airlines
Immatriculation: N127UA
Numéro de série: 28813/1221
Année de Fabrication: 1999-07-07 (6 years 7 months)
Moteurs: 4 Pratt & Whitney PW4056
Equipage:victimes: 0 / à bord: 14
Passagers:victimes: 0 / à bord: 99
Total:victimes: 0 / à bord: 113
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Melbourne-Tullamarine Airport, VIC (MEL) (   Australie)
Phase de vol: Au roulage (TXI)
Nature:Transport de Passagers Nat.
Aéroport de départ:Melbourne-Tullamarine Airport, VIC (MEL/YMML), Australie
Aéroport de destination:Sydney-Kingsford Smith International Airport, NSW (SYD/YSSY), Australie
Numéro de vol:UA840
A Boeing 747-422, operated by United Airlines, was taxiing for departure at Melbourne Airport, Australia. At the same time, a Boeing 767-338ER operated by Qantas was stationary on taxiway Echo and waiting in line to depart from runway 16. The tail section of the 767 was protruding into taxiway Alpha while it was stationary on taxiway Echo awaiting a clearance to enter the runway.
The pilots of the 747 received a clearance to taxi, which included a taxi route from the international apron to the holding point on taxiway Bravo, for a departure from runway 16, via taxiways Uniform then Alpha. The pilot in command of the 747 deviated from the taxi clearance issued by the surface movement controller and turned the 747 right into taxiway Echo, to pass behind the 767. The left wing tip of the 747 collided with the right horizontal stabiliser of the 767 as the 747 crew attempted to manoeuvre behind the 767.

The taxiway dimensions and markings at Melbourne Airport complied with international standards and were suitable for use by the aircraft types involved in the occurrence.

The 747 crew was aware of the 767, and chose to pass behind it rather than wait on taxiway Alpha until the 767 was no longer obstructing the taxiway. The decision by the pilot in command of the 747 to deviate off the centreline of taxiway Alpha and taxi behind the 767 did not comply with the taxi clearance issued by the SMC. It was based on his assessment that it was safe to do so. The pilot in command of the 747 misjudged the distance between the wingtip of the 747 and the right horizontal stabiliser of the 767, which resulted in the collision.

Accident investigation:
Investigating agency: ATSB
Status: Investigation completed
Duration: 148 days (5 months)
Accident number: 200600524
Download report: Summary report
Language: English


photo of Boeing-747-422-N127UA
accident date: 02-02-2006
type: Boeing 747-422
registration: N127UA

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 Melbourne-Tullamarine Airport, VIC et Sydney-Kingsford Smith International Airport, NSW est de 703 km (440 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.
languages: languages


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