Mxsmanic wrote:

B A R R Y writes:


I always think of 727's as being very loud.


They are. Even the APU (or whatever they call it) is extremely noisy.


Well, the 727 APU cannot be used in flight.

I don't know where your expertise on 727s comes from, but I know where
mine comes from and the 727 was relatively quiet compared to most other
airline airplanes at its time of entering service.