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Accident
Last updated: 21 October 2017
Statuts:Enquête Officielle
Date:jeudi 22 septembre 1966
Heure:13:03
Type/Sous-type:Silhouette image of generic VISC model; specific model in this crash may look slightly different
Vickers 832 Viscount
Compagnie:Ansett-ANA
Immatriculation: VH-RMI
Numéro de série: 416
Année de Fabrication: 1959
Heures de vol:18634
Cycles:6586
Moteurs: 4 Rolls-Royce Dart 525
Equipage:victimes: 4 / à bord: 4
Passagers:victimes: 20 / à bord: 20
Total:victimes: 24 / à bord: 24
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:16 km (10 milles) WSW of Winton, QLD (   Australie)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Mount Isa Airport, QLD (ISA/YBMA), Australie
Aéroport de destination:Longreach Airport, QLD (LRE/YLRE), Australie
Numéro de vol: 149
Détails:
Ansett-ANA Flight 149 took off at 12:08 for a 73-minute flight to Longreach. The flight progressed, apparently uneventfully, until 12:52 when the Longreach-Flight Service Unit heard the crew of VH-RMI say that it was on an emergency descent and to stand by. Two minutes later the aircraft advised that there were fire warnings in respect of no. 1 and 2 engines, that one of these warning conditions had ceased and that the propeller of the other engine could not be feathered. At 12:59, information from the crew of VH-RMI, relayed to Longreach through--the crew of another aircraft in the vicinity, indicated that there was a visible fire in no. 2 engine and that the aircraft was diverting below 5000 ft, to Winton.
The Vickers Viscount was descending at an indicated airspeed close to 170 knots between 3500 and 4000 ft above ground level . At this point the port wing failed upwards between engines 1 and 2. It struck the top of the fuselage, which at the same time was cut open by the blades of the no. 1 engine, and fell away from the remainder of the aircraft . The cabin shell above floor level was quickly broken away by air loads until eventually the rear fuselage and empennage also separated from the aircraft. The remaining forward fuselage, with the lower mid fuselage, starboard, wing and, engines and port wing stub with the no. 2 engine still attached, struck the ground at the edge of a clay pan and was immediately engulfed in flames.

Probable Cause:

PROBABLE CAUSE: "The means of securing the oil metering unit to the no.2 cabin blower became ineffective and this led to the initiation of a fire within the blower, which propagated to the wing fuel tank and substantially reduced the strength of the main spar upper boom. It is probable that the separation of the oil metering unit arose from an out-of-balance condition induced by rotor break-up but the source of the rotor break-up could not be determined."

Sources:
» ICAO Aircraft Accident Digest No.16 - Volume II, Circular 82-AN/69 (73-84)


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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 Mount Isa Airport, QLD et Longreach Airport, QLD est de 580 km (362 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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Vickers Viscount

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  • 59ème loss
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