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When switching air supplies from the APU to the engine air supplies, we got this odour in the Cabin - I call it the dirty sock smell. I have smelled it numerous times in the past. I might add that most of the time, and I have
23 BASI Occurrence (Incident) Brief 199703707, 29 October 1997, pp 1-2
24 Confidential submission C10, attached paper p 4
25 Confidential submission C10, attached paper p. 4
smelled it in the past, it has never bothered me - it is just uncomfortable. … a very short time later, about a minute later, I felt just a slight light-headedness coming about, so what I did was I took the oxygen mask. I did not actually properly don it; I just took it and held it up to my face … What happened, as I pretty much expected it would, was that the symptoms of this sort of light-headedness went away pretty much straightaway. … The flight progressed. …
The smell went away. …
…. two minutes after take-off … halfway between Wollongong and Canberra, and the light-headedness thing sort of came back again and a very, very dull headache transpired, so I started breathing the oxygen again. Lo and behold, it started to go away and, as the flight progressed and once again I was not breathing oxygen the whole time - it went away and then it started coming back again. And then later I just had very dry scratchy eyes, a sore throat, that sort of thing, a taste in my mouth, and the only way I could describe it is it tastes like it smells. … on descent at the lower altitudes going into Melbourne, I then became aware that with the points of light, … there was some blurring in my long-distance vision. Once again it was not major.
We landed without incident … It was not until that point, in walking across the ramp at Melbourne, that I realised that I had a slight disorientation. I do not really know how to describe it - not staggering, falling over drunk, but it was very obvious that there was something wrong, that there was a minor incapacitation, …
I have had exposure to these fumes before; it had never bothered me, and now it bothered me. …26
5.34 During this incident the co-pilot noticed the smell in the cockpit but was not significantly affected by it. During the flight to Melbourne Captain Goulet did not hand over command of the aircraft to the co-pilot. 27
5.35 Mr John Johnson, Engineering Fleet Manger with Ansett told the Committee that this incident had occurred as a result of a failure of a bearing seal in one of the aircraft’s engines. This failure had allowed oil to leak through a bearing into the compressor and out through the diffuser duct eventually allowing fumes to enter the cockpit.28
26  Ansett Australia, Evidence, 1 May 2000, pp 247-248 
27  Ansett Australia, Evidence, 1 May 2000, p 247 
28  Ansett Australia, Evidence, 1 May 2000, p 248 

5.36 Mr Johnson also told the Committee that airframe modifications had not been incorporated on this aircraft or on other freighter aircraft.29 When questioned on the difference in the modifications that have been carried out on passenger carrying BAe 146 aircraft and those that only carry freight Mr Johnson advised:
　
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