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Search: Posts Made By: Turbine D
Showing results 1 to 35 of 130
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Forum: Tech Log
17th Mar 2013, 22:32
Replies: 746
Views: 209,822
Posted By Turbine D

barit1, I absolutely agree with your...

barit1,

I absolutely agree with your statement. It is a best design practice. You may not be able to prevent a disk that fractures due to a defect, but you can prevent a run away disk reaching a...
Forum: Tech Log
17th Mar 2013, 22:06
Replies: 746
Views: 209,822
Posted By Turbine D

RichPa, From the BEA Final Report (I...

RichPa,

From the BEA Final Report (I eliminated the sections pertaining to brake details):

I would assume the engines that couldn't be shutdown were at idle or close to idle.
Forum: Tech Log
17th Mar 2013, 21:49
Replies: 746
Views: 209,822
Posted By Turbine D

The engine on the QF32 was not at idle, it ran at...

The engine on the QF32 was not at idle, it ran at the thrust setting at the time when the disc failure on the adjacent engine occurred during climb out. As I recall, the crew had to deal with this...
Forum: Tech Log
17th Mar 2013, 17:44
Replies: 746
Views: 209,822
Posted By Turbine D

Dozy, Don't forget about the A-340 testing...

Dozy,

Don't forget about the A-340 testing incident at Airbus that hit the wall on November 15, 2007...

From the BEA Report:


Again the electrical connections from the engines to the...
Forum: Tech Log
13th May 2012, 18:55
Replies: 746
Views: 209,822
Posted By Turbine D

Lyman Your quote: The GP7200 engine...

Lyman

Your quote:

The GP7200 engine does not have an IPT rotor, it is a two spool engine and the HPT consists of two rotors, Stage 1 and Stage 2.

Your quote:

Perhaps this view of the...
Forum: Tech Log
11th May 2012, 20:23
Replies: 746
Views: 209,822
Posted By Turbine D

Lyman, Your quote: The (GE/Pratt) Engine...

Lyman,
Your quote:

The (GE/Pratt) Engine Alliance GP7200 is a 2 spool engine verses the Trent 900 that is a 3 spool engine. By showing you a cutaway of the GP7200 engine, I wanted you to note...
Forum: Tech Log
11th May 2012, 18:08
Replies: 746
Views: 209,822
Posted By Turbine D

Lyman, Your quote: No, No, No, that is...

Lyman,

Your quote:

No, No, No, that is what you don't want to have happen. What you want to have happen is the turbine blades to stay with the disc which is holding them so that if the disc...
Forum: Tech Log
10th May 2012, 00:32
Replies: 746
Views: 209,822
Posted By Turbine D

barit1 & Lyman, Here is the Trent 900 engine...

barit1 & Lyman,

Here is the Trent 900 engine cross-section for your information. Also, one thing I forgot to convey, the disc burst speed I gave was for a normal operating temperatures. With the...
Forum: Tech Log
9th May 2012, 23:33
Replies: 746
Views: 209,822
Posted By Turbine D

Lyman, I only mention the IP shaft because...

Lyman,

I only mention the IP shaft because you think it move rearward, somehow separating from the coupling in the compressor section. It did not!

Your quotes:

And,
Forum: Tech Log
9th May 2012, 14:56
Replies: 746
Views: 209,822
Posted By Turbine D

Lyman, The innermost shaft is the LP, the...

Lyman,

The innermost shaft is the LP, the outermost is the HP and IP shaft is between the HP & LP. The bearing supporting the HP rotors are separate (independent) from the IP rotors.

The IP...
Forum: Tech Log
9th May 2012, 14:33
Replies: 746
Views: 209,822
Posted By Turbine D

Hi barit1, On the Trent 900 engine, the LP &...

Hi barit1,

On the Trent 900 engine, the LP & IP rotors turn counter clockwise with the HP rotor turning clockwise. This enables elimination of the stationary nozzle between the HPT blade wheel and...
Forum: Tech Log
9th May 2012, 14:16
Replies: 746
Views: 209,822
Posted By Turbine D

Lyman, Your quote: Again, from the...

Lyman,

Your quote:


Again, from the ATSB Interim Factual Report



Quite honestly, I never saw this report until yesterday. It describes what I have thought and tried to express to you...
Forum: Tech Log
8th May 2012, 18:52
Replies: 746
Views: 209,822
Posted By Turbine D

Lyman, Lets go through some facts...

Lyman,



Lets go through some facts again.

From the latest ATSB Interim-factual Report:

"The investigation has found that the intermediate pressure (IP) turbine disc failed as a result of...
Forum: Tech Log
27th Apr 2012, 00:49
Replies: 746
Views: 209,822
Posted By Turbine D

Lyman, Do you realize that if you...

Lyman,



Do you realize that if you stand in front of a turbofan engine and grasp one of the fan blades with your little finger you can, with very, very little effort at all, turn the fan over,...
Forum: Tech Log
26th Apr 2012, 13:15
Replies: 746
Views: 209,822
Posted By Turbine D

I have given you my thoughts, there is nothing...

I have given you my thoughts, there is nothing more to add....

TD
Forum: Tech Log
26th Apr 2012, 00:43
Replies: 746
Views: 209,822
Posted By Turbine D

Lyman, We have been through this many...

Lyman,



We have been through this many times. This engine had been inspected and passed the spline wear requirements before being placed back in service. The rigid coupling of the IP shaft,...
Forum: Tech Log
25th Apr 2012, 00:20
Replies: 746
Views: 209,822
Posted By Turbine D

lomapaseo, What you do is understand...

lomapaseo,



What you do is understand this is a possibility, and you design so that if the power drive arm would fracture releasing the turbine wheel from the shaft, it would not reach an...
Forum: Tech Log
24th Apr 2012, 18:07
Replies: 746
Views: 209,822
Posted By Turbine D

barit1, Good post!:ok: I completely...

barit1,

Good post!:ok:

I completely agree with what you said, it's all in the design...

Regards,

TD
Forum: Tech Log
28th May 2011, 00:55
Replies: 746
Views: 209,822
Posted By Turbine D

Bear, You could be right, I just never...

Bear,

You could be right, I just never thought of it that way.

TD
Forum: Tech Log
27th May 2011, 21:34
Replies: 746
Views: 209,822
Posted By Turbine D

ASTB May 18 Update

eagle farm,

As I read this interim update, there really is nothing new except for the correction made as to the area of fatigue in the photo of the fractured stub pipe. The report does give the...
Forum: Tech Log
26th May 2011, 00:27
Replies: 746
Views: 209,822
Posted By Turbine D

Bear, The "new" area they now point out as the...

Bear,
The "new" area they now point out as the fatigue crack almost looks to me as a brittle failure (no ductility) rather than a fatigue failure, in other words, it just snapped due to lack of...
Forum: Tech Log
4th Mar 2011, 19:03
Replies: 746
Views: 209,822
Posted By Turbine D

Oil Leaks & Vibration

Anonybocks

My guess would be that the external oil leaks being experienced by Singapore are probably due to vibrations where the tube fastening nuts are vibrating loose. Rolls Royce, in proceeding...
Forum: Tech Log
28th Feb 2011, 22:40
Replies: 746
Views: 209,822
Posted By Turbine D

ZimmerFly Timing is everything when it...

ZimmerFly



Timing is everything when it comes to effective P/R, eh? Not to minimize the gravity of the Qantas T900 situation, but more often than not, the release of good news, a...
Forum: Tech Log
24th Feb 2011, 16:25
Replies: 746
Views: 209,822
Posted By Turbine D

The Case of Rolls-Royce plc

Some very interesting comments and observations to my original question, thanks!
Here is an interesting read. The pendulum swings from one side to the other over the past 40 year, maybe?
...
Forum: Tech Log
23rd Feb 2011, 14:06
Replies: 746
Views: 209,822
Posted By Turbine D

Some questions, maybe slightly off topic, maybe...

Some questions, maybe slightly off topic, maybe not:

Why is it that the most prominent UK engineering company goes outside the firm to bring in top leadership and who's education and background...
Forum: Tech Log
20th Feb 2011, 01:04
Replies: 746
Views: 209,822
Posted By Turbine D

I would certainly believe British Airways is...

I would certainly believe British Airways is counting on this being the case with their recent order!

By the way, except for the current flying pilots, first officers and flight attendants, we are...
Forum: Tech Log
20th Feb 2011, 00:43
Replies: 746
Views: 209,822
Posted By Turbine D

Flapping Madly I think they probably...

Flapping Madly



I think they probably do. Anybody in public business today is interested in what is being said, right or wrong about what they do or make. Years ago my wife had a TV VCR home...
Forum: Tech Log
19th Feb 2011, 23:02
Replies: 746
Views: 209,822
Posted By Turbine D

Flapping Madly I think the bottom-line...

Flapping Madly



I think the bottom-line to this question is SFC (specific fuel consumption). When Airbus decided to examine the possibility of building a new long range transport, larger than...
Forum: Tech Log
19th Feb 2011, 21:10
Replies: 746
Views: 209,822
Posted By Turbine D

There isn't another RR engine that would perform...

There isn't another RR engine that would perform the A-380 task, but there is an engine (partly made by GE & partly made by P&WA) on some A-380's, the GP7200. Emirates and Air France's A380's have...
Forum: Tech Log
19th Feb 2011, 00:28
Replies: 746
Views: 209,822
Posted By Turbine D

You put together a good list of attributes for a...

You put together a good list of attributes for a jet engine. Just have to add, check the bolts and fittings twice for proper torque and I think you got it!:)

Then there is the matter of ratcheting...
Forum: Tech Log
18th Feb 2011, 22:53
Replies: 746
Views: 209,822
Posted By Turbine D

When a oil tube joint is found loose, it would be...

When a oil tube joint is found loose, it would be natural to assume it wasn't tightened properly during original assembly by the assembly mechanic. That is the obvious and it could be true. It may...
Forum: Tech Log
18th Feb 2011, 14:13
Replies: 746
Views: 209,822
Posted By Turbine D

Here is the history of the #2 engine prior to...

Here is the history of the #2 engine prior to failure from the ASTB report:



Take a look at the engine parameter chart again, you may want to print it out to see it better. The bottom graph is...
Forum: Tech Log
17th Feb 2011, 22:00
Replies: 746
Views: 209,822
Posted By Turbine D

DozyWannabe Although a fan blade broke on...

DozyWannabe

Although a fan blade broke on this engine, it was actually the stage 1 LP compressor blade that was the problem:

Analysis of the engine from the crash determined that the fan blades...
Forum: Tech Log
17th Feb 2011, 20:57
Replies: 746
Views: 209,822
Posted By Turbine D

Here is a report I found (pdf.file) that gives...

Here is a report I found (pdf.file) that gives some status and information on the composite GE90 fan blades. They are doing quite well, more current data indicates only 17 fan blades have required...
Forum: Tech Log
17th Feb 2011, 00:28
Replies: 746
Views: 209,822
Posted By Turbine D

Barit1, you are correct, some very critical...

Barit1, you are correct, some very critical components are bought from speciality suppliers, forgings, from which discs, casings and engine mounts are machined from, investment castings from which...
Showing results 1 to 35 of 130
 
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