At 1814 Central Standard Time on 2 April 2007, an Israel Aircraft Industries 1124, Westwind aircraft, registered VH-AJP, with a crew of two, departed Darwin Airport, NT on a scheduled cargo service to Alice Springs, NT. At 1844, during climb, at 34,000 ft, the crew heard a series of loud bangs followed by a loss in cabin pressure. The crew donned oxygen masks, closed the aircraft outflow valves and conducted an emergency descent to 10,000 ft. The aircraft was returned to Darwin.
An inspection of the aircraft revealed a hole in a top rear fuselage skin panel. The examination revealed that approximately 60% of the panel had been damaged by exfoliation corrosion. The damage was most severe at the primary site of rupture, in the centre of the panel.
The panel was clad with a corrosion resistant pure aluminium alloy sheet; however, the aluminium cladding was removed on the chemical milled areas. Over time, the coating protecting of the chemical milled areas had deteriorated, leading to the corrosion on the panel.
The panel was located in an area that was not considered susceptible to corrosion, so there were no detailed inspections required for the area.
As a result of this occurrence, the manufacturer has issued a notice to all 1124 Westwind aircraft operators informing them of the event and the corrosion that was found. The operator has carried out an inspection of the area on their entire fleet of 1124 Westwind aircraft. Where corrosion was present, the operator replaced the panel. The operator has also included an inspection of the area in their Corrosion Control Program.
|Date:||02 April 2007||Investigation status:||Completed|
|Location:||343km S Darwin|
|Release date:||05 March 2008||Occurrence class:||Operational|
|Report status:||Final||Occurrence category:||Serious Incident|
|Highest injury level:||None|
|Aircraft manufacturer||Israel Aircraft Industries Ltd|
|Type of operation||Air Transport Low Capacity|
|Damage to aircraft||Nil|
|Departure point||Darwin, NT|
|Destination||Alice Springs, NT|