Hilife Thanks for taking the time to do that research.
Hilife / Lonewolf_50 Contacts at Fort Rucker insist the H-60 started with stainless steel bolts not titanium studs.
I see "the CH-53E Sea Stallion which utilizes six titanium studs". Why only three studs on the S-92A? Weight again?
With even just 4 studs, geometrically the filter housing would have been less susceptible to the loss of one stud.
The fastening system for the oil filter bowl of the S-92A used anodized titanium alloy studs, silver-plated steel nuts and cadmium-plated steel washers. Anodizing and plating increases resistance to corrosion, wear and galling.
Really?! Wasn't galling the failure mode here?! This just begs more questions than it answers.
This question by Lonewolf_50 remains valid:
...how was the lesson learned in the incident in Australia (previous to this tragic crash) spread among the interested parties? A variety of "if we know this, what do we do with that information" arises every time things are discovered in the field.
This question is informed by the case of a swashplate bearing and the eventual addition of the bearing monitor panel, in another model of aircraft.
I understand this comment to mean the H-53 disaster after a quality control deception by a Sikorsky supplier discussed here:
http://www.pprune.org/rotorheads/202...g-failure.html
and
At Sikorsky Aircraft, A Flight Gone Wrong - NYTimes.com