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Thanks guys. I see those were a production change when Bravo came out. It's the only "new thang" that's not included on my helicopter.
Why did Dennis feel like this was needed as a change?
* Maybe so the same bolt could engage a few more internal threads of the spuds
When the Bravo hit the market, Dennis believed the frame cracks were because owners flew them in an un-balanced condition and he had not
came out with the Mast Support kit yet. Most Bravo changes centered around trying to fix that. From memory, Bravos included:
* Cast aluminum pitch arms,
* Thicker tubing on some frame tubes
* A dynamically balanced centrifugal clutch
* Strut-Saver insert tubes to strengthen the landing gear legs
* Different preload in the blade cones
* New Track and Balance Charts
* Better Spherical Teter Bearings and these recessed washers
* Different MRGB Pinion Bearing arrangement (Two dual row angular contact instead of 3 or 4 single row)
* ??
I still don't see why these recessed washers could have helped with any of the problems.