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Accident
Last updated: 20 October 2017
Status:Definitief
Datum:vrijdag 12 maart 1999
Tijd:07:30
Type:Silhouette image of generic B733 model; specific model in this crash may look slightly different
Boeing 737-377
Luchtvaartmaatschappij:Ansett Australia Airlines
Registratie: VH-CZL
Constructienummer: 23664/1326
Bouwjaar: 1986-12-18 (12 years 3 months)
Motoren: 2 CFMI CFM56-3B1
Bemanning:slachtoffers: 0 / inzittenden:
Passagiers:slachtoffers: 0 / inzittenden:
Totaal:slachtoffers: 0 / inzittenden:
Schade: Groot
Gevolgen: Repaired
Plaats:Melbourne-Tullamarine Airport, VIC (MEL) (   AustraliŽ)
Fase: Nadering (APR)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Launceston Airport, TAS (LST/YMLT), AustraliŽ
Vliegveld van aankomst:Melbourne-Tullamarine Airport, VIC (MEL/YMML), AustraliŽ
Beschrijving:
At the appropriate time during the approach sequence, the co-pilot of the Boeing 737, who was the handling pilot for the sector, called for the landing gear to be extended. When the pilot in command placed the landing gear lever to the "down" position, a loud thump was heard and the "gear safe" green light for the right main gear illuminated immediately. This was followed by the illumination of the left main and nose landing gear lights, consistent with a normal extension sequence. The aircraft rolled approximately 4 degrees to the right while the gear was extending. This was counteracted by a left roll control input.
As the crew had received indications that the landing gear was safely locked down, they continued the approach and completed a normal landing.
Ramp maintenance staff briefly inspected the aircraft but did not find any immediate cause for the reported thump. The aircraft was then placed on jacks for a retraction test. When the landing gear lever was selected to the "up" position, the right main landing gear moved inboard approximately 15 cm before a grinding noise was heard. The test was immediately suspended and the landing gear was extended.
When access panels were removed, it was found that the actuator beam arm inboard lugs and beam hanger had fractured. The rear wing spar, landing gear beam, aileron bus cable, pulley bracket, aileron and spoiler cables and hydraulic lines had been damaged extensively following the fracture of the lugs and hanger.
Inspection of the actuator beam arm revealed that the fracture of both lugs was due to stress corrosion cracking.

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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 Launceston Airport, TAS en Melbourne-Tullamarine Airport, VIC bedraagt 475 km (297 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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