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Search: Posts Made By: Flight Safety
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Forum: Rumours & News
4th Feb 2009, 16:06
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

AF, I'm willing to accept the explanation that...

AF, I'm willing to accept the explanation that good knowledge of cold fuel behavior is either not well or widely understood.

I think we always learn in aviation, for example take ditching an...
Forum: Rumours & News
3rd Feb 2009, 23:17
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

AF, if it did have the bypass, I suspect we...

AF, if it did have the bypass, I suspect we wouldn't be discussing this accident.
Forum: Rumours & News
3rd Feb 2009, 22:40
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

From the Flight Global article, it appears the GE...

From the Flight Global article, it appears the GE and PW design recirculates some of the heated fuel back to the upstream face of the FOHE, thus preheating the new cold fuel approaching the upstream...
Forum: Rumours & News
3rd Feb 2009, 21:59
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

This Flight Global article is interesting. It...

This Flight Global article is interesting. It explains the AD, and how the GE and PW FOHE installations are different from the Trent 895.

Boeing links Heathrow, Atlanta Trent 895 engine rollbacks...
Forum: Rumours & News
6th Jul 2008, 14:01
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Dated1, you're not thinkng clearly. Consider...

Dated1, you're not thinkng clearly. Consider this:

At 700ft, landing gear and flaps out, you suddently discover engines don't have the power to maintain glide slope, you quickly know you're going...
Forum: Rumours & News
20th Jun 2008, 16:34
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

I have another idea. I noticed looking at...

I have another idea.

I noticed looking at the drawings supplied by Machaca, that all 3 fuel pickups are located next to what appears to be a bulkhead between the main tank and the center wing...
Forum: Rumours & News
20th Jun 2008, 16:15
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Whatever the restriction or obstruction was, it...

Whatever the restriction or obstruction was, it was very consistent on both sides of the airplane. This should be an important clue because with this kind of consistency (on both sides of the...
Forum: Rumours & News
19th Jun 2008, 23:07
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

The problem with the FCOC is heat is transferred...

The problem with the FCOC is heat is transferred from the oil to the fuel. This would seem to reduce our chances for ice formation between the LP pump and HP pump. Further, we haven't heard anything...
Forum: Rumours & News
19th Jun 2008, 22:48
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Yes, thanks Machaca. It looks likes there...

Yes, thanks Machaca.

It looks likes there are 3 fuel pickups for each tank (left and right). Each of the 2 boost pumps (per tank) has it's own pickup, and the suction feed has it's own pickup. So...
Forum: Rumours & News
19th Jun 2008, 22:34
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Or it could be that when the fuel flow rate...

Or it could be that when the fuel flow rate increased with the power increase, something got sucked into the pickup screens (that later disappeared) thus reducing the flow and was held there by the...
Forum: Rumours & News
19th Jun 2008, 16:32
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

I'm not sure I accept the resonance theory, but...

I'm not sure I accept the resonance theory, but for the sake of discussion....

Years ago I once had a hot water shower faucet that resonated. It would start as the water got hot (temperature...
Forum: Rumours & News
17th Jun 2008, 13:46
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Resonance

I'm not sure I see how resonance could be set up (or sustained) in this system.

First, the fuel was cold and viscous to some degree. The non return valve is one way, thus tending to cancel any...
Forum: Rumours & News
15th Jun 2008, 16:02
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Since both engines initially responded to the...

Since both engines initially responded to the autothrottle with increased thrust, that meant the restriction or obstruction was not in effect yet, at least not initally. Then within 3 secs or so, the...
Forum: Rumours & News
13th Jun 2008, 15:56
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Rightbase is correct, air in the fuel stream will...

Rightbase is correct, air in the fuel stream will not cause cavitation damage, for the reasons he stated. This was caused by a fuel obstruction or restriction.

In fact, if you think about it,...
Forum: Rumours & News
23rd May 2008, 17:53
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Surely early in the investigation, someone...

Surely early in the investigation, someone thought to subject some of the recovered fuel to controlled progressively colder temperatures, to see if it developed any unusual properties that might...
Forum: Rumours & News
19th May 2008, 19:37
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Regarding water in the fuel. It's not at all...

Regarding water in the fuel. It's not at all uncommon for aircraft on long duration flights to land with fuel temps below 0C (or 32F). I stand to be corrected, but I don't see how a "not significant"...
Forum: Rumours & News
13th May 2008, 21:48
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Bsieker, a few counter-remarks. ...

Bsieker, a few counter-remarks.



Understood about the positive pressure from the boost pumps. However I'm not sure what parameters are recorded in the FDR for the boost pump. An...
Forum: Rumours & News
13th May 2008, 19:47
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Just to add to the collapse/rebound pipe work...

Just to add to the collapse/rebound pipe work theory stated above. If this did happen, maybe there is some evidence such as some small remaining distortion, or paint or other coating with tiny...
Forum: Rumours & News
13th May 2008, 19:12
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Mechanical Deformation

What about this possibility.

Pumping high volumes (caused by demand for thrust increase) of very cold viscous fuel (fuel still within specs of course), where some part of the fuel system plumbing...
Forum: Rumours & News
12th May 2008, 20:46
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Bubbers44, it's easy enough to test temp probe...

Bubbers44, it's easy enough to test temp probe accuracy in the current configuration. Just instrument the fuel tank at multiple locations and go fly it at cold levels.
Forum: Rumours & News
12th May 2008, 20:40
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

What I hope the AAIB doesn't eventually issue is...

What I hope the AAIB doesn't eventually issue is a "probable cause" result for this accident, meaning "we don't know what caused it, but we think it was this".
Forum: Rumours & News
12th May 2008, 20:10
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Borghha, what would the AAIB recommend? Since the...

Borghha, what would the AAIB recommend? Since the cause is not known yet (and this cause is a real mystery resulting in a difficult investigation), how would you suggest avoiding a repeat?
Forum: Rumours & News
23rd Mar 2008, 19:21
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

This quote is from this link on the Shell...

This quote is from this link on the Shell website, aviation fuels for civil aircraft.
...
Forum: Rumours & News
23rd Mar 2008, 15:20
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Is there any possible way the fuel could have...

Is there any possible way the fuel could have been Russian TS-1, which has a freeze point of -57C, min low flash point of 28C, and has properties and test methods similar to Jet A-1?
Forum: Rumours & News
18th Feb 2008, 22:02
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Two odd things stand out in the report regarding...

Two odd things stand out in the report regarding the fuel.



And...



Is it normal for Jet A-1 to have a freezing temp of -57C? Is this really pure Jet A-1, or is it mixed with something...
Forum: Rumours & News
18th Feb 2008, 21:24
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Sorry if this sounds oversimplified, but if the...

Sorry if this sounds oversimplified, but if the tanks had enough fuel, the EECs responded correctly to the request for more power, the fuel metering valves were wide open, and the HP fuel pumps were...
Forum: Rumours & News
18th Feb 2008, 18:01
Replies: 3,239
Views: 1,137,519
Posted By Flight Safety

Fuel pump cavitation is a complex issue, it may...

Fuel pump cavitation is a complex issue, it may take a while to sort that one out.
Showing results 1 to 27 of 27


 
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