> Shenzhen, Thank You for clearing that up for me.
Perhaps what I actually learned (in this forum), was that as a jet engine is spooling down after fuel cut-off (no more hot combustion), the intake compressors & exhaust turbines help to force heat out off the engine, both internally & externally, which helps prevent heat damage.
If this is the case for Boeing airliners, then I guess it's most likely the same for Airbus, McDonnell Douglas, Lockheed, Fokker, Fairchild, BAe, Canadair, Embraer, etc.
When you see an airliner sitting on a ramp all alone and it's intake fan blades are slowly turning in the breaze, are the internal N1 & N2
compressors plus the turbine blades in the exhaust pipe also turning? Or are they isolated from being able to windmill freely via all the different shafts within the main shaft?
I'm asking about this because I'm wonder how the high & low pressure compressors would be lubricated if they're spinning while the engine is off, plus I thought it was only the jet blast of hot gases from the combustion chamber that made the rear turbines spin.
I've seen many jet engine fan blades turning in the wind at Toronto Intl, but never noticed if the exhaust turbines were spinning too.