Network Australia F100 near Newman on Jun 7th 2016, loss of cabin pressure
Last Update: September 28, 2016 / 15:32:35 GMT/Zulu time
Australia's TSB rated the occurrence a serious incident and opened an investigation.
On Sep 28th 2016 the ATSB released their final report releasing following comment:
Air-conditioning pack 1 is located on the left side of the aircraft underneath the floor of the flight deck, just aft of the left seat, which places it close to underneath the floor of the forward lavatory. The pack 1 plenum duct likely ruptured at about FL 305 to produce what the aircraft captain described as a loud ‘whooshing’ noise and what the cabin manager described as a ‘suction’ noise. According to Flight Safety Foundation Human Factors and Aviation Medicine, the immediate donning of oxygen masks by the flight crew, following an ‘excessive cabin altitude’ warning, is the essential first step to surviving a high altitude depressurisation.
The subsequent maintenance investigation found duct leaks from both air-conditioning systems. However, only the leak from air-conditioning pack 1 triggered an alert to the pilots, and that fault was associated with an overheat condition. In accordance with the operator comments, the rapid increase in the cabin pressure altitude rate of climb, which occurred when the flight crew turned pack 1 off, indicates that pack 2 alone could not supply a sufficient quantity of air to the distribution ducting to maintain cabin altitude. The systems were only able to re-pressurise the aircraft following the descent to 10,000 ft (the demands on the pressurisation system were substantially reduced) and the successful reset of pack 1.
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This article is published under license from Avherald.com. © of text by Avherald.com.
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