Aural Warning
In the aftermath of an incident in 1999 in which the pilot of a Beechcraft Super King Air suffered hypoxia, the ATSB published Report 199902928 and recommended an aural warning be fitted on the flight deck of all Australian Beechcraft Super King Air aircraft. The flight deck of the Beechcraft Super King Air only has visual warning of inadequate cabin pressure.
In the aftermath of the Ghost Flight the Civil Aviation Safety Authority issued a Discussion Paper and a Notice of Proposed Rule Making (NPRM), both proposing aural warning in the Beechcraft Super King Air and other pressurised aircraft. The outcome of consultation on the NPRM was that the Civil Aviation Safety Authority did not mandate aural warning of inadequate cabin pressure and this angered the families of some of the victims. Instead, the Civil Aviation Safety Authority issued a notice to owners of pressurised aircraft registered in Australia recommending installation of an aural warning, but not making it mandatory. The notice said, "The benefit to your pilots and passengers lies in the reduction in risk of an uncommanded depressurisation leading to an incident or fatal accident. The benefit is much greater than the cost of purchase and installation of one of these low-cost systems."
Read more about this topic: 2000 Australia Beechcraft King Air Crash
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