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Search: Posts Made By: riff_raff
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Forum: Rotorheads
3rd Jul 2015, 09:05
Replies: 1,141
Views: 340,518
Posted By riff_raff

There was quite a bit of discussion on this...

There was quite a bit of discussion on this thread about the design issues with the S-92 MRGB. As I pointed out, in my opinion, the use of just 3 fasteners to attach the oil filter housing did not...
Forum: Rotorheads
27th Nov 2011, 23:55
Replies: 1,141
Views: 340,518
Posted By riff_raff

While a properly qualified transmission 30-minute...

While a properly qualified transmission 30-minute loss of lube capability is a good idea, it doesn't completely eliminate lube system related failures in the transmission. Here's a fatal crash that...
Forum: Rotorheads
17th Aug 2011, 05:06
Replies: 1,141
Views: 340,518
Posted By riff_raff

Flyt3est, Your point about cost/risk...

Flyt3est,

Your point about cost/risk analysis is well made. I would also add that executives in the aircraft business are not the greedy, crass, heartless people some make them out to be. Upper...
Forum: Rotorheads
24th Jul 2011, 03:19
Replies: 1,141
Views: 340,518
Posted By riff_raff

NoBiggie, Your point about setting a...

NoBiggie,

Your point about setting a benchmark based on a single test is well made. The particular MRGB build that failed 11 minutes into the loss-of-lube test may have been a statistical...
Forum: Rotorheads
2nd Jul 2011, 23:34
Replies: 1,141
Views: 340,518
Posted By riff_raff

Shell Management- The materials were...

Shell Management-

The materials were developed by QuesTek Innovations using computational design techniques. Latrobe Steel is the licensee.

Here's a good overall presentation....
Forum: Rotorheads
28th Jun 2011, 04:35
Replies: 1,141
Views: 340,518
Posted By riff_raff

"They do seem content to leave the S-92 without a...

"They do seem content to leave the S-92 without a full 30 minute capability which is a great concern but at least they are:

1) confirming that the S-92 has an MGB no better then aircraft a...
Forum: Rotorheads
7th Mar 2011, 00:49
Replies: 1,141
Views: 340,518
Posted By riff_raff

zalt, Thanks for the link. That particular...

zalt,

Thanks for the link. That particular AH-64 MRGB lube system situation was a bit different than what happened with the Cougar S-92 MRGB, but it does provide a perfect example of how a...
Forum: Rotorheads
14th Feb 2011, 06:21
Replies: 1,141
Views: 340,518
Posted By riff_raff

Sultan, You bring up a good point with...

Sultan,

You bring up a good point with regards to taking a closer look at the effects the tail rotor drive failure had. The TSB report notes that the data recorder showed an indication of rotor...
Forum: Rotorheads
5th Feb 2011, 02:30
Replies: 1,141
Views: 340,518
Posted By riff_raff

Maybe NickLappos can answer a question for me...

Maybe NickLappos can answer a question for me regarding the design of the S-92 MRGB lube oil filter housing. I'm not a transmission design expert, but one thing I do know is that with a single path...
Forum: Rotorheads
3rd Jan 2011, 03:15
Replies: 1,141
Views: 340,518
Posted By riff_raff

212man, It would have been helpful if you...

212man,

It would have been helpful if you would have read the entire post. Apparently, you missed the very first sentence: "While I can't speak specifically about the main gearbox in...
Forum: Rotorheads
2nd Jan 2011, 02:27
Replies: 1,141
Views: 340,518
Posted By riff_raff

poppahymen, While I can't speak specifically...

poppahymen,

While I can't speak specifically about the main gearbox in question, in general, anytime a main gearbox is run under loss of lube conditions it should be taken out of service and...
Forum: Rotorheads
8th Dec 2010, 22:43
Replies: 1,141
Views: 340,518
Posted By riff_raff

"You would think Sikorsky would have been really...

"You would think Sikorsky would have been really focused on all the ways oil could be lost, especially the appendages, like the filter among others"

squib66,

The problem is not just with...
Forum: Rotorheads
1st Dec 2010, 03:24
Replies: 1,141
Views: 340,518
Posted By riff_raff

Update on S-92 gearbox housing foot cracks: ...

Update on S-92 gearbox housing foot cracks:

Root cause of S-92 gearbox cracks remains elusive...
Forum: Rotorheads
19th Nov 2010, 23:57
Replies: 1,141
Views: 340,518
Posted By riff_raff

It would be interesting to have access to design...

It would be interesting to have access to design details of the S-92 MRGB housing. You could use Sikorsky's published design guidelines to see if the S-92 housing passes their own hazard function...
Forum: Rotorheads
16th May 2010, 05:30
Replies: 1,141
Views: 340,518
Posted By riff_raff

poppahymen, Here's a website...

poppahymen,

Here's a website (http://s92facts.wordpress.com/) with lots of links about the recent S-92 issues. It was apparently put together by someone with a vested interest in the matter. ...
Forum: Rotorheads
8th May 2010, 03:51
Replies: 1,141
Views: 340,518
Posted By riff_raff

CBC article

That CBC article from May 6th seemed fairly reasonable. The S-92 MRGB housing inspection directives put in place seem to be working, and this time a housing crack was detected before it caused a...
Forum: Rotorheads
9th Jan 2010, 04:39
Replies: 1,141
Views: 340,518
Posted By riff_raff

more titanium and silver

Variable Load,

I did a little research on the subject and I'd like to update my response to you. From what I have read, the issue between silver and titanium alloys is more correctly a stress...
Forum: Rotorheads
9th Jan 2010, 03:30
Replies: 1,141
Views: 340,518
Posted By riff_raff

Ag on Ti galvanic potential

Variable Load,

Sorry for the tardy reply. Silver against Ti is usually prohibited due to galvanic corrosion issues. This situation would likely be exacerbated by a marine atmosphere.

Here's...
Forum: Rotorheads
31st Dec 2009, 05:04
Replies: 1,141
Views: 340,518
Posted By riff_raff

Oil filter studs.

madrock,

One thing I noticed looking at pictures of the recovered hardware from the S-92 that crashed due to the MRGB oil filter housing failure, was that it had what appeared to be silver-plated...
Forum: Rotorheads
15th Nov 2009, 08:20
Replies: 1,141
Views: 340,518
Posted By riff_raff

30 minute loss-of-lube

The FAR29 MRGB 30 minute requirement is for a loss of lube system functionality condition, and does not necessarily imply that the MRGB is operating entirely without lubricant. And as for the S-92...
Forum: Rotorheads
12th Nov 2009, 07:36
Replies: 1,141
Views: 340,518
Posted By riff_raff

Outwest, "Are you on drugs man???" It's...

Outwest,

"Are you on drugs man???"

It's not me, it's the FAA. So lighten up.

"FAR 29.927.-
[(c) Lubrication system failure. For lubrication systems required for proper operation of rotor...
Forum: Rotorheads
8th Nov 2009, 06:36
Replies: 1,141
Views: 340,518
Posted By riff_raff

S-92 MRGB "run-dry" time....

maxwelg2,

The MRGB in the S-92, like all other FAA certified rotorcraft MRGB's, is qualified for operating in a 30 minute loss of lube condition while maintaining power levels sufficient for level...
Showing results 1 to 22 of 22


 
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