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The Australian Transport Safety Bureau did not conduct an on-scene investigation of this occurrence. The report presented below was derived from information supplied to the Bureau.

While en route from the Jundee mine site to Perth, cruising at FL220, the crew of the Fairchild Industries Inc Metro 23, registration VH-WBA, saw the cabin altitude gauge indication climbing at a rate of about 8,000 ft/minute. The crew, suspecting a pressurisation failure, donned oxygen masks and directed the passengers to do the same. They contacted Melbourne Centre air traffic control and received a clearance to immediately descend to 14,000 ft. Once level at the amended cruise altitude, the use of passenger oxygen masks was discontinued and the flight proceeded to Perth.

Company maintenance investigation could not detect the reason for the pressurisation fault. Extensive trouble shooting was carried out in accordance with the manufacturer's maintenance manual, followed by ground runs and a test flight. The aircraft and its systems performed normally.

The aircraft was placed on a maintenance watch and returned to service where it has since operated without incident.

General details
Date: 07 July 2004 Investigation status: Completed 
Time: 1828 hours WST  
Location   (show map):463 km NW Perth, Aero. Investigation type: Occurrence Investigation 
State: Western Australia Occurrence type: Air/pressurisation 
Release date: 29 September 2004 Occurrence class: Technical 
Report status: Final Occurrence category: Incident 
 Highest injury level: None 
Aircraft details
Aircraft manufacturer: Fairchild Industries Inc 
Aircraft model: SA227 
Aircraft registration: VH-WBA 
Serial number: DC-883B 
Type of operation: Charter 
Damage to aircraft: Nil 
Departure point:Jundee, WA
Departure time:1710 hours WST
Destination:Perth, WA
Crew details
RoleClass of licenceHours on typeHours total
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Last update 13 May 2014