Zeke
I was assuming that the sound would be transmitted through the structure if the aircraft, but maybe it does not work that way. The whole fuselarge must have twisted when the fin snapped off, presumably followed by a torsional oscillation. I agree about not hearing the APU, but one does hear the flap extension mechanism operating and the gear being lowered. The loudest bang I ever heard in an aircraft was a tyre blowing after retraction, seemingly right under my feet.
Cheers,
