PPRuNe Forums - View Single Post - EC225 crash near Bergen, Norway April 2016
Old 11th Jun 2016, 06:41
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buzz66
 
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Originally Posted by TylerMonkey
Re: Concentric
" Thirdly, Figure 7 and Figure 9 show how the epicyclicexternal ring gear burst open across both 1st and 2ndstages around the 4 o’clock position directly adjacent to an M/R servo location.What would be the effect of a planet gear or fragment bursting out and breakingthe right hand rear servo ? "

Could damage to a servo theoretically cause a cyclic change so abrupt that it could over stress the front suspension strut and cause it to fail ? That might explain the fast horizontal fuselage deceleration you described. I know the answer is not within our grasp but it is one possible sequence of events that would explain why/if the strut failed after the event started.
Seems there is possibly evidence (failure under extreme tensile load) that the strut was intact when the event started, which would make it more unlikely that the strut failed first and that caused the event.
Interesting post.
I like the theory.
I'm pretty sure any servo damage caused from an exploding gearbox would be easily identified, due nature of the damage, especially when compared to the other 2 Servo's
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