Originally Posted by
Ian W
Perhaps people should be careful what they wish for. EASA could easily (make up) regulate a life time safe exposure limit after which flight even as a passenger on bleed air pressurized turbojets was severely constrained. It happens in other industries.
Long term the only solution is electric pumped pressurization, it would make the engines run more efficiently too.
Allegations would then be made of oil leaks from motor-driven compressor bearings.
Re efficiency, you are still using engine power to drive electric or hydraulic compressors with the attendant electrical, mechanical and thermodynamic losses.