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The technology of today really means that to get a compressor to drive all that air into the aircraft there really need to be some bearings and some oil. To me, as an engineer, it does not matter much whether it is a separate compressor driven by an electrical motor or a compressor driven by an engine. It will come to the same thing in the end, because it will have oil and bearings in it and they will be subject to failure. Indeed, aeroplanes have been like that for a long while. There might come a day when you can develop a compressor that does not need oil - maybe some air bearings or something of that kind. But I suspect that engines will be that way as well.21
Domestic and international laws and standards for the quality of air in aircraft
2.21 Australia has adopted design standards and requirements for all aircraft which are certified to operate in Australian airspace. As noted above, these include United States Federal Aviation Regulations (FAR’s) (section 25) and joint European Aviation Regulations (section 25). Both standards have requirements dealing with cabin ventilation and contamination in an aircraft. FAR 25.831 requires:
(a)
Under normal operating conditions and in the event of any probable failure conditions of any system which would adversely affect the ventilating air, the ventilation system must be designed to provide a sufficient amount of uncontaminated air to enable the crewmembers to perform their duties without undue discomfort or fatigue and to provide reasonable passenger comfort….

(b)
 Crew and passenger compartment air must be free from harmful or hazardous concentrations of gases or vapours. …

(c)
There must be provisions made to ensure that the conditions described in para B. .. are met after reasonably probable failure or malfunctioning of the ventilating, heating, pressurisation or other systems and equipment.

19  Submission 11, British Aerospace, p 127 (vol 1) 
20  Associate Professor C. van Netten, Evidence, 14 March 2000, p 206 
21  British Aerospace, Evidence, 10 April 2000, p 227 

2.22 CASA confirmed to the Committee:
Perhaps an important section is a statement under section 25.831 of FAR 25, which says that: ‘Crew and passenger compartment air must be free from harmful or hazardous concentrations of gasses and vapours.’ That is the only statement that is in there at present. What constitutes ‘harmful’ or ‘hazardous’ is left up to other standards, and generally they are getting into the health standards.22
2.23 In contrast, the Committee received evidence from the AFAP as a supplementary submission highlighting the requirements in paragraphs (a) to (c) of the regulation, and stated “… large number of crews are not getting ‘a sufficient amount of uncontaminated air to enable crewmembers to perform their duties without undue discomfort and fatigue”.23
　
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