A second for this song found many years ago in an old book that I can't remember the title of!

Three valve springs you'll find in my stomach
Two spark plugs are safe in my lungs
The propeller's in splinters inside me
To my fingers the joystick is clung
Take the prop boss out of my liver,
The aileron out of my thigh
From the seat of my pant take the piston
And see if the old crate will fly

I was told by a RAF veteran that this song was written in WW1 by a member of the Flying Corps, then banned by the RAF in WWII as "bad for morale"