Bertie the Bunyip wrote:

Robert Moore wrote in
5.205:


Bertie the Bunyip wrote

The next generation are eschewing bleed air driven pressurisation
and going to seperate supercharger systems. A lot of older turboprops
used this system as well as a small number of jets. The 787 will have
this system.

The B-707 had both Bleed Air and Turbochargers. We used the Turbochargers
most of the time. An engine bleed line spun a turbine which then turned
a fresh outside air compressor.


Yeah, that was the jet exception I had noted. You were lucky you didn't
have to breath the compresser section air in that thing!
The JT8 was OK AFAIK There would have been some fumes, but the RB-211 is a
complete piece of junk. The Brits never could build an oil tight engine....




Bertie
We should be thankfull that the british did not supply the electrics,
AKA Lucas the prince of darkness, otherwise the cabin would be full of
smoke, and nothing would work!