Selected material regarding source of air contamination
on BAe 146.
1. NJS hansard 1/2/00- p139- " the 502 can leak from the
fan area...a No. 9 bearing seal, and that oil can be re-ingested into
the core. That is only a very very slight leak, and it is quite evident
on the ground if it occurs. You can actually see oil leak into the bypass
of the engine. Another area is the No.1 seal. It is inside the compressor
core of the engine and that is extremely difficult to pinpoint on
the ground. It normally shows itself either by a report of the cabin smell
or an increase in oil consumption..... There is another area that is even
harder. It is the diffuser and that is only visible if you physically
do a bore-scope inspection of the engine..... Some of these leaks are
quite evident and some of them are not so evident."
p 134- " A major leap forward in the reliability of the engine oil
seals can be identified as a result of the Allied Signal... Honeywell,
XRP extended reliability program for the engines......All the bearing
oil seals are replaced by new parts rather than being installed after
the existing seals have been inspected".
2. C.Van Netten Air Quality and Health Effects Associated
with the Operation of the BAe 146-200 Aircraft"- Appl. Occup. Environ.
Hyg 13(10) 1998
" ...the air quality complaints have been traced to leaky oil seals
associated with bearings 1 and 9 of the jet engines."
3. BAe submission to Australian Senate-3/9/99-
Cabin air quality -“in 1992 reports of cabin odours appeared
in Australia and investigation established that small quantities of oil
could migrate through the Auxiliary Power Unit (APU) and engine bearing
seals into the air conditioning system. ….In response the engine and APU
manufacturers have since introduced modifications, which are being embodied
-“British Aerospace has throughout remained sensitive to its customer
needs and concerns, and has in particular worked with the manufacturers
of the engines and the APU to produce a package of optional modifications
in1992, and more recently working with Ansett to produce a suite of customer
enhancements to improve the cabin environment”
4. BAe Hansard- 2/11/99-
p 85 " As recently as 1996-97 we continued to improve the sealing
properties of the bearings and seals."
5a. BAe senate submission volume 4
'Chronology of BAe modifications and enhancements introduced since 1990
relevant to cabin air quality issues' see attached: engines, APU
& Environmental Control System
5b. Ansett Pilot Union submission , volume 2
'Ansett Inter-office memorandum, 26 May 1998- BAe 146 Cabin odours'-
Brief summary of initiatives introduced by engineering to combat the problem
of cabin odours and fumes on the BAe 146 fleet.
6. CASA Airworthiness Directive 30 March, 2001
AD/BAe146/86 'Environmental Control System Inspection for
....At any time cabin air contamination is suspected to be associated
with engine oil, carry out the inspections specified in British Aerospace
Inspection Service Bulletin ISB.21-150, Paragraph 2A and 2B and the associated
BAe 146/RJ Service Information Leaflet No21-45 and BAe146/RJ Operational
Notice OP 16 contain information with respect to required aircrew action
in the event of a suspected cabin air contamination event. Such
action includes specific provisions for oxygen usage by the flight
7. Mr. Williams-BAe- Senate Hansard 10 April ,2000
" We all acknowledge....... that the modifications will not
solve the problem completely. They are to reduce the number of events,
and that is what is important."
“the modifications …are really around the reliability of the seals and
that they do not fail as frequently. So they are improvements to reliability,
rather than improving the quality of sealing.."
refers to BAe ISB 21-150 & SIL 21-45 on source of fumes/ oil contamination
& modifications- bearings & seals
NJS - Senate Hansard- 10/4/00-p218/219- "for a very short period
a bluish haze went down the cabin for about 90 seconds or so... there
was no requirement to deploy oxygen masks in the cabin.... The number
2 bearing package, which was the cause of the problem in the engine, they
have redesigned a locating pin.