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Forum: Rotorheads

8th Nov 2017, 08:28

Replies: 212

225 cleared to fly in UK & Norway

Views: 116,954

Posted By Concentric

Whilst the desire to recreate actual operating...

Whilst the desire to recreate actual operating conditions inside a gearbox as faithfully as possible might at first suggest a whole-gearbox test, if that test were taken to failure it would not only...

Forum: Rotorheads

6th Oct 2017, 15:12

Replies: 212

225 cleared to fly in UK & Norway

Views: 116,954

Posted By Concentric

You might want to take another look at the voting...

You might want to take another look at the voting figures...
It doesn't take a maths guru to see that the voting trend is now more and more towards "No", currently 49% overall and that very few have...

Forum: Rotorheads

29th Jul 2017, 10:29

Replies: 212

225 cleared to fly in UK & Norway

Views: 116,954

Posted By Concentric

In Root Cause Analysis...

In Root Cause Analysis (https://en.wikipedia.org/wiki/Root_cause_analysis), the design features and detection or monitoring system failings you describe above would be regarded as causal factors but...

Forum: Rotorheads

27th Jul 2017, 09:11

Replies: 212

225 cleared to fly in UK & Norway

Views: 116,954

Posted By Concentric

SASless, Generally speaking, I am in...

SASless,

Generally speaking, I am in agreement that the definitive cause (or ‘root cause’ as I would prefer to call it) has not yet been satisfactorily explained or reported. The regulators...

Forum: Rotorheads

26th Jul 2017, 08:23

Replies: 212

225 cleared to fly in UK & Norway

Views: 116,954

Posted By Concentric

Their individual explanations are not mutually...

Their individual explanations are not mutually exclusive but in fact describe different phases in the failure sequence. That sequence is something of a chain reaction that ought to have been...

Forum: Rotorheads

23rd Jul 2017, 07:48

Replies: 212

225 cleared to fly in UK & Norway

Views: 116,954

Posted By Concentric

Would that include the Sikorsky S-92A tailrotor...

Would that include the Sikorsky S-92A tailrotor drive I wonder?

Forum: Rotorheads

20th Jul 2017, 16:06

Replies: 212

225 cleared to fly in UK & Norway

Views: 116,954

Posted By Concentric

I am afraid you have got me...

I am afraid you have got me there.:rolleyes::confused:

Forum: Rotorheads

20th Jul 2017, 15:04

Replies: 212

225 cleared to fly in UK & Norway

Views: 116,954

Posted By Concentric

Obviously there should be no silica inside the...

Obviously there should be no silica inside the gearbox. If it does get in there as contamination during gearbox module or mast installation, or during lubricant filling, its hardness might be a...

Forum: Rotorheads

20th Jul 2017, 09:13

Replies: 212

225 cleared to fly in UK & Norway

Views: 116,954

Posted By Concentric

RVDT, I have been wondering the same since...

RVDT,

I have been wondering the same since reading your post (http://www.pprune.org/3429369-post425.html) from 10 years ago.

I do think the lubricant is a very important and possibly...

Forum: Rotorheads

16th Jul 2017, 09:29

Replies: 212

225 cleared to fly in UK & Norway

Views: 116,954

Posted By Concentric

Whilst some testing is appropriate and I would...

Whilst some testing is appropriate and I would hope has been undertaken, I think just running the power train under sustained stress alone might not be the way to replicate the conditions that led to...

Forum: Rotorheads

10th Jul 2017, 15:09

Replies: 212

225 cleared to fly in UK & Norway

Views: 116,954

Posted By Concentric

There must have been some very major development...

There must have been some very major development between 28 June (https://www.flightglobal.com/news/articles/uk-caa-sees-no-prospect-of-quick-return-for-grounded-438857/) when the CAA released a...

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