Originally Posted by
SplineDrive
Wrench1, what were the circumstances of previous upper deck failures on the 206L series? Did the entire nodal beam suspension system and transmission stay with the upper roof structure in those incidents?
All were MR strikes. And yes, the entire MR system stayed attached to the roof/roof beam structure. In the more notable one, an L-3 was over the beach when the pilot fell ill and passed out. The LH pax unbuckled and grabbed the controls but the pilot kept falling on the cyclic. A rear pax unbuckled and reached through headrest to hold pilot back in seat. LH pax got it down to the marsh and during the “landing” phase the MR hit the ground and tore out the roof section similar to NYC one. Unfortunately, since they were unbuckled, those 2 pax were ejected out the open roof area and died. The remaining pax (2) and pilot survived. I believe it was food poisoning that caused the pilot to pass out.
Originally Posted by
Salusa
I believe that the description of "Collective Bounce" is a misnomor at best.
I’ve only heard it called collective bounce which is the term Bell used as well. I also seem to recall a couple accident reports using the same term as a factor in the probable cause.
Currently the distribution of that information is via Van Horn only and therefore relys on an organisations own internal procedures to pass that information onto the crews at the sharp end.
I did hear that supposedly Van Horn recently revised their bulletin on L model collective bounce so I guess that was how they informed their customers of the issue? And being this was a Part 135 ops, I would have expected this bulletin to be part of the GOM or similar document.