I want to thank you lads but you are ALL WRONG! :-)
I distinctly remember a early 50s film. And it'll be the usual story... mysterious airliner crashes and the struggle to find the cause. But the 11th hour scene, the finale, is there is a big plane on a big vibrating test rig and it's shaking the plane. Then just as they're about to give it up, the tail falls off, this proving the heros thesis was right.
The plot was something along those lines... it was the type of film you'd find Bernard lee or Geoffrey keen in. :-)
But there was deinite a test rig and the whole tailplane falls off. NHITS, while that double tailplane of the Reindeer strikes a chord, it doesn't seem like it. I may be wrong, do they test the Reindeer on a test-rig with the tail breaking off?
Cheers, I'll carry on with my
:-)