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4.40 Dr Lewis of Ansett told the inquiry in evidence that Tedlar bags used during the tests on the BAe 146 were:
… closed off and returned to Melbourne and tested by the Australian Government Analytical Laboratories. The testing procedure for volatile organic compounds, which is what we were looking for, was approved by the Australian Government Analytical Laboratories.38
4.41 Dr Lewis went on to state:
… Allied Signal, the manufacturers of the engines and the APU, … came out and did extensive testing in summa canisters - another more expensive way of testing - and took the results back to the States where they met all the American standards for testing. Thirdly, we had Dr Lee from the Queensland Health Scientific Services, who had a real time gas chromatograph. This was real time analysis that he could do on flights and on the ground. He also used a liquid nitrogen entrapment thing which actually sucked the cabin air through a flask of liquid nitrogen. Every molecule was frozen and sealed off and then taken back to the Queensland gas chromatography laboratories and tested. Additionally, very early on, Professor Vasak from Sydney together with New South Wales Workcover laboratories did swabs and air testing by separate methods. The numbers were small admittedly, but that was our first try at analysis. With the number of samples we have taken, approved by governments and done by government agencies, I fail to see that this was an unreliable test method.39
37 Associate Professor Chris Winder, Evidence, 1 November 1999, p 5, see also pp 13-14
38 Ansett Australia, Evidence, 2 November 1999, p 59
39 Ansett Australia, Evidence, 2 November 1999, p 59; see also Ansett Australia, Evidence, 1 May 2000,
p 251
4.42 In response to claims that some tests on the BAe 146 were not conducted at high altitudes but on the ground Mr David Villiers of CASA told the inquiry:
If you run the engines on the ground at the appropriate power with the airconditioning systems on it makes no difference, because the fumes will come through the aircraft on the ground as if it were in the air.40 …
Where these fumes have been generated is inside the engine and, while there may be some minor differences, the temperature changes from ambient to the inside of the engine are very significant. While they will be different altitude, I do not think they are going to make a great deal of difference to what we are looking at. 41
New testing program by British Aerospace
4.43 On 10 April 2000 Mr Bruce Jones of British Aerospace advised the inquiry:
… we are developing our own test program to enable us to develop further data on any potential contaminants in the cabin air supply. The intention is to use a portable detector to carry out a series of controlled measurements of the cabin air environment, having introduced known quantities of specific contaminants into the airconditioning system of a non-service -or test aircraft. This will enable us to build up a profile of the signature of each potential contaminant at each stage of flight. The detector can then be used by individual operators to determine the precise profile of any contamination suspected on a particular aircraft. This should enable more precise corrective maintenance action to be taken and may also identify any further design enhancements which can be introduced.42
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