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Search: Posts Made By: firstfloor
Showing results 1 to 35 of 62
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Forum: Engineers & Technicians
2nd Jun 2011, 10:42
Replies: 0
Views: 723
Posted By firstfloor

Martin-Baker Mk16A or similar

After looking recently again at the history of Martin-Baker ejection seats up to Mk14 and the article about the Mk16A that was published in Flight International in June 1997 I was wondering if anyone...
Forum: Tech Log
5th Jan 2011, 18:11
Replies: 746
Views: 210,811
Posted By firstfloor

I think the AD inspections and established...

I think the AD inspections and established intervals will remain in force for some time to verify findings if nothing else. The final report is awaited of course but it may be that RR have...
Forum: Tech Log
5th Jan 2011, 17:43
Replies: 746
Views: 210,811
Posted By firstfloor

Obviously, Qantas have dug themselves a very deep...

Obviously, Qantas have dug themselves a very deep hole. But what is fairly clear by now is that there was never at fault anything fundamentally more serious that a badly formed stub pipe connection....
Forum: Tech Log
5th Jan 2011, 17:23
Replies: 746
Views: 210,811
Posted By firstfloor

Rolls-Royce engines cleared for LA take-off | The...

Rolls-Royce engines cleared for LA take-off | The Australian (http://www.theaustralian.com.au/business/engines-cleared-for-la-take-off/story-e6frg8zx-1225982631762)

QANTAS has been given the...
Forum: Tech Log
5th Jan 2011, 10:41
Replies: 746
Views: 210,811
Posted By firstfloor

Just so nobody goes away with the idea that Rolls...

Just so nobody goes away with the idea that Rolls Royce is the only one with engine problems. In the news today is this.

But back on subject, it seems to me that the only way to know if the C...
Forum: Tech Log
3rd Jan 2011, 17:08
Replies: 746
Views: 210,811
Posted By firstfloor

Annex14: From the article. And the date of...

Annex14:
From the article.

And the date of this report is?
Forum: Tech Log
3rd Jan 2011, 16:23
Replies: 746
Views: 210,811
Posted By firstfloor

I really must strongly disagree once again. Not...

I really must strongly disagree once again. Not formula one, not lightweight in the sense you mean. The difference is three spools, the design goal since the sixties being efficiency and compact...
Forum: Tech Log
3rd Jan 2011, 13:47
Replies: 746
Views: 210,811
Posted By firstfloor

Lawyers and machinery, a fictional account.

RR: It was just a stub pipe. It’s fixed, you’re good to go.
Q: Wait a minute. You see our lawyers have said we have to be sure that everything’s ok before we fly again.
RR: It is. Have a nice...
Forum: Tech Log
2nd Jan 2011, 14:28
Replies: 746
Views: 210,811
Posted By firstfloor

I think this is quite wrong. There is nothing...

I think this is quite wrong. There is nothing wrong with the type certification process. Engines meeting the relevant specifications will perform as expected albeit that a new fleet will inevitably...
Forum: Tech Log
2nd Jan 2011, 12:23
Replies: 746
Views: 210,811
Posted By firstfloor

Qantas A380s to return to US route, Airbus misses...

Qantas A380s to return to US route, Airbus misses delivery target (http://www.smh.com.au/travel/travel-news/qantas-superjumbos-to-return-to-us-route-20101231-19bi1.html)


The connection between...
Forum: Tech Log
29th Dec 2010, 13:38
Replies: 746
Views: 210,811
Posted By firstfloor

Overspeed is the mechanism described in AD 0262 -...

Overspeed is the mechanism described in AD 0262 -


Other complications have no standing per rule of Occam's razor.
Forum: Tech Log
29th Dec 2010, 11:22
Replies: 746
Views: 210,811
Posted By firstfloor

I am trying to follow the arguement so far. It...

I am trying to follow the arguement so far. It looks like this, Oil leakage, oil fire, heating of drive arm leading to failure (first bang?), turbine wheel overspeed because of disconnect from load...
Forum: Tech Log
27th Dec 2010, 23:42
Replies: 746
Views: 210,811
Posted By firstfloor

I see where you get this from but bear in mind...

I see where you get this from but bear in mind that there is no CVR at this time so loud bangs cannot be placed on the timeline. Yes the overheat parameter is timed but "at the same time" is vague in...
Forum: Tech Log
27th Dec 2010, 15:53
Replies: 746
Views: 210,811
Posted By firstfloor

The charts at the back of the report show N3...

The charts at the back of the report show N3 reducing after the burst. I do not see any N2 overspeed. Ductile failure probably refers to large plastic deformation due to turbine overspeed and...
Forum: Tech Log
27th Dec 2010, 13:38
Replies: 746
Views: 210,811
Posted By firstfloor

From the report. Not too diffucult...

From the report.



Not too diffucult to understand surely!
Forum: Tech Log
27th Dec 2010, 12:03
Replies: 746
Views: 210,811
Posted By firstfloor

Old Engineer about FO emergency actions: ...

Old Engineer about FO emergency actions:


No you don't. The first thing that happens, that the crew is aware of, is two nearly simultaneous loud bangs (the engine failure). No more loud bangs...
Forum: Rumours & News
23rd Dec 2010, 17:04
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

Yes, that's nice stuff. Thankyou. Simplest...

Yes, that's nice stuff. Thankyou. Simplest illustration to follow is front end of the Honeywell AS907 showing nut and spline. Axial load through the nut, torsion in the spline. Very common and...
Forum: Rumours & News
23rd Dec 2010, 15:30
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

That’s hardy a forensic analysis Bearfoil. Since...

That’s hardy a forensic analysis Bearfoil. Since they are based on very nearly zero evidence, your conclusions have to be taken as extremely dubious if not completely mad (I regret to say).
Forum: Rumours & News
23rd Dec 2010, 14:42
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

The AD you refer to does explain what would...

The AD you refer to does explain what would happen if the splines wore through. In practice, no flight engine is allowed to approach that limit. If the splines were worn through the half shafts would...
Forum: Rumours & News
23rd Dec 2010, 14:13
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

The way I look at it is that although a shaft...

The way I look at it is that although a shaft consists of two half shafts, the half shafts are joined at a rigid coupling so that they behave exactly as if they were a single unit. We do not know the...
Forum: Rumours & News
23rd Dec 2010, 09:18
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

What complete rubbish! Have a look at the diagram...

What complete rubbish! Have a look at the diagram on page 70. The HP spool has two bearings, the other spools have three each. Main bearing in the centre and roller bearings at each end.

Forget...
Forum: Rumours & News
20th Dec 2010, 20:53
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

FT.com / Companies / Aerospace & Defence -...

FT.com / Companies / Aerospace & Defence - Rolls-Royce scrambles to pin down problem (http://www.ft.com/cms/s/0/3e5a2254-0c67-11e0-8408-00144feabdc0,s01=1.html#axzz18gtQWsGe)
Forum: Rumours & News
20th Dec 2010, 17:04
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

Found this link to description of typical jet...

Found this link to description of typical jet engine turbine to compressor coupling. Not meant to represent RB211 technology but may well be quite similar.

YouTube - J79 Main Coupling - Turbine...
Forum: Tech Log
16th Dec 2010, 09:08
Replies: 127
Views: 33,296
Posted By firstfloor

Well, you can always rely on big business and...

Well, you can always rely on big business and politics to ride roughshod over little people. It seems to be an example of a problem too big to fix so it gets buried instead. It’s human nature...
Forum: Rumours & News
14th Dec 2010, 08:52
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

More news on this here. Bearing compartment...

More news on this here.

Bearing compartment module behind secondary Trent 900 oil leak...
Forum: Rumours & News
13th Dec 2010, 13:36
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

Rolls Royce to report to Qantas this week: report...

Rolls Royce to report to Qantas this week: report | News | Business Spectator...
Forum: Rumours & News
10th Dec 2010, 15:20
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

Turbine D Oil sediment! – not enough to...

Turbine D


Oil sediment! – not enough to sip – early model - one careful owner – nothing to worry about sir.

I think they’ll have to do better than that if they want compensation. Also note...
Forum: Rumours & News
10th Dec 2010, 13:42
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

We rely on hindsight; Qantas, Rolls and the rest...

We rely on hindsight; Qantas, Rolls and the rest are working with all the known facts at each stage of the process. Qantas in particular may have been over influenced by the ALAEA briefing against...
Forum: Rumours & News
10th Dec 2010, 10:04
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

Some pundits are thinking that RR have bigger...

Some pundits are thinking that RR have bigger design issues, causing excessive vibration for example, and incurring greater costs than they are admitting. But I would expect RR to be playing with a...
Forum: Rumours & News
10th Dec 2010, 08:40
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

Not really, was referring to this article in...

Not really, was referring to this article in flightglobal. Thought they must be on about A, B, C builds rafter than software protections.

"Trent 900 shortage keeps Qantas A380s grounded " - but...
Forum: Rumours & News
10th Dec 2010, 07:08
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

Massive crisis mismanagement at Qantas, they seem...

Massive crisis mismanagement at Qantas, they seem to be waiting for 11 perfectly good engines to be modified to latest build standard or replaced. Idiots! I would not think for one minute that they...
Forum: Rumours & News
9th Dec 2010, 07:20
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

With the benefit of hindsight, this is roughly...

With the benefit of hindsight, this is roughly what Alan Joyce should have said on 4 Nov.

Ladies and Gentlemen,
Initial inspections of the damage suggest that a turbine disk has burst and...
Forum: Rumours & News
8th Dec 2010, 19:58
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

I knew about the spline wear AD. Realised also...

I knew about the spline wear AD. Realised also what you were driving at but it was clear to me that the authorities were not indicating any link to previous experience.

I agreed with CAAAD who...
Forum: Rumours & News
8th Dec 2010, 18:54
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

Most likely only some attention to the...

Most likely only some attention to the manufacturing quality of the affected part. Nothing fundamental at fault. Remember that the Trent has a very long pedigree, its durability being a direct result...
Forum: Rumours & News
8th Dec 2010, 13:32
Replies: 1,964
Views: 1,340,037
Posted By firstfloor

No, this is Bearfoil theory. No official...

No, this is Bearfoil theory. No official documents are making this connection.
Showing results 1 to 35 of 62
 
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