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Search: Posts Made By: avrflr
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Forum: Tech Log
14th Mar 2008, 21:33
Replies: 32
Views: 8,345
Posted By avrflr

On the subject of towing to the runway....

AR used to operate 747s between AKL and EZE. SOP was to fuel them to capacity, pull the CBs for the fuel overfill shutoffs and then fill them until a little bit of fuel spilled out of the vents. ...
Forum: Rumours & News
25th Feb 2008, 23:12
Replies: 3,239
Views: 1,139,939
Posted By avrflr

Some encouragement for the water boys...

From the report:
"On examination, both of the engine spar valves were
found to be OPEN, allowing the fuel leak evident at the
accident site."

Can someone please explain how a fuel leak occurs...
Forum: Rumours & News
23rd Feb 2008, 21:50
Replies: 3,239
Views: 1,139,939
Posted By avrflr

A miracle: the odds of it happening within the...

A miracle: the odds of it happening within the lifetime of the Universe is indistinguishable from zero.
Probability that I may be proven to be totally wrong: 1 in 4:)

I accept that the...
Forum: Rumours & News
23rd Feb 2008, 04:48
Replies: 3,239
Views: 1,139,939
Posted By avrflr

1. Ice melts leaving water at the bottom of...

1. Ice melts leaving water at the bottom of whatever fuel it is in, making it difficult for it to evaporate.
2. I don't believe all of the water is going to get out of the engines' fuel systems. ...
Forum: Rumours & News
23rd Feb 2008, 02:38
Replies: 3,239
Views: 1,139,939
Posted By avrflr

You forgot number 3: number 2 happens without it...

You forgot number 3: number 2 happens without it being logged by any on board systems. We'll call that miracle number 1So, miracle number 2 is that the last drop of water passes through the...
Forum: Rumours & News
22nd Feb 2008, 04:04
Replies: 3,239
Views: 1,139,939
Posted By avrflr

Can the experts also explain how the > 138...

Can the experts also explain how the > 138 gallons of water then chokes the engines, causes the plane to crash and leaves not a trace of water in the wing tanks?

If you dissolved 2 cups full of...
Forum: Rumours & News
21st Feb 2008, 03:41
Replies: 3,239
Views: 1,139,939
Posted By avrflr

The ice theories are the most enticing. I talked...

The ice theories are the most enticing. I talked to a QF engineer today who was totally convinced it was ice blocking the fuel-oil heat exchangers. So if we accept for a moment that this hypothesis...
Forum: Rumours & News
20th Feb 2008, 04:48
Replies: 3,239
Views: 1,139,939
Posted By avrflr

About 20800kgs, depending on S.G.

About 20800kgs, depending on S.G.
Forum: Rumours & News
19th Feb 2008, 23:36
Replies: 3,239
Views: 1,139,939
Posted By avrflr

Not to me Says who? Correct, hence A/P...

Not to me Says who? Correct, hence A/P disconnect. No, the AOA was high because the A/P was trying to keep the aircraft on glideslope, but since the engines weren't co-operating, it couldn't.
Forum: Rumours & News
19th Feb 2008, 20:27
Replies: 3,239
Views: 1,139,939
Posted By avrflr

You must know something about fuel that I don't. ...

You must know something about fuel that I don't. If testing won't exonerate it, what will?

I'm all for speculation, but let's have hypotheses that don't require me to believe that the AAIB are...
Forum: Rumours & News
19th Feb 2008, 20:06
Replies: 3,239
Views: 1,139,939
Posted By avrflr

Continuing to defend the fuel

The spec for the fuel includes that it must contain less than (I think) 30 parts per million of water and that it must be free of solid contaminants. The AAIB report states that there was no...
Forum: Rumours & News
19th Feb 2008, 19:27
Replies: 3,239
Views: 1,139,939
Posted By avrflr

Terribly sorry for being so rude old chap, but...

Terribly sorry for being so rude old chap, but ten and a half tons is not a low fuel configuration in my book. Plenty of 777s fly around happily with less than that. I wasn't suggesting that the...
Forum: Rumours & News
19th Feb 2008, 18:56
Replies: 3,239
Views: 1,139,939
Posted By avrflr

So you are saying that despite the fact that...

So you are saying that despite the fact that someone got inside the wing tanks and found a plastic scraper, a piece of tape etc it didn't strike them as odd that there was no fuel in there? You...
Forum: Rumours & News
19th Feb 2008, 07:04
Replies: 3,239
Views: 1,139,939
Posted By avrflr

soggy_cabbage: That quote seems pretty...

soggy_cabbage: That quote seems pretty self-explanatory. Which part don't you understand?

Edit: Nice one daysleeper:D
Forum: Rumours & News
18th Feb 2008, 23:37
Replies: 3,239
Views: 1,139,939
Posted By avrflr

Given that the lowest recorded fuel temperature...

Given that the lowest recorded fuel temperature was -34 degrees, it's a moot point.
Forum: Rumours & News
18th Feb 2008, 23:32
Replies: 3,239
Views: 1,139,939
Posted By avrflr

Not sure I follow you there. If there's a...

Not sure I follow you there. If there's a blockage upstream of the HP pump the pressure in the line feeding into it is going to go from positive to negative pretty quickly (the pumps cavitated for...
Forum: Rumours & News
18th Feb 2008, 22:50
Replies: 3,239
Views: 1,139,939
Posted By avrflr

Yes, it is normal. The fuel gets sample tested...

Yes, it is normal. The fuel gets sample tested during the refuel, and for various reasons it is highly unlikely that water can get on to the aircraft at this point. The AAIB reports states that...
Forum: Rumours & News
18th Feb 2008, 21:39
Replies: 3,239
Views: 1,139,939
Posted By avrflr

Several people have said that the A/P did the...

Several people have said that the A/P did the best possible job under the circumstances. I'm sure the crew did what any good crew would have done in that situation, but.....

If they had...
Forum: Rumours & News
16th Feb 2008, 21:02
Replies: 451
Views: 289,964
Posted By avrflr

So if cold fuel isn't the culprit, how about cold...

So if cold fuel isn't the culprit, how about cold water? How would an engine respond if you ran it on progressively more "watery" fuel? Erratic combustor inlet pressure? Failure to produce much...
Forum: Rumours & News
15th Feb 2008, 20:24
Replies: 451
Views: 289,964
Posted By avrflr

Or indeed any large aircraft. If there are big...

Or indeed any large aircraft. If there are big lumps of frozen fuel in your tanks, having four engines wouldn't be much consolation. It is surprising that there appears to be a single point of...
Forum: Tech Log
14th Feb 2008, 10:49
Replies: 6
Views: 1,383
Posted By avrflr

GE90-115B (the only engine you can have on a...

GE90-115B (the only engine you can have on a 777-200LR/300ER). I think the chord doesn't change from the root to the tip that much - it's more that the blades are "twisted" so you are looking at...
Forum: Rumours & News
13th Feb 2008, 21:22
Replies: 451
Views: 289,964
Posted By avrflr

Have you ever done a fuel drain on an A/C that...

Have you ever done a fuel drain on an A/C that has been sitting in freezing temperatures for 24 hours? Is it possible that ice might stay in the tank and not drain out? Was a fuel drain even...
Forum: Tech Log
7th Feb 2008, 11:40
Replies: 15
Views: 2,426
Posted By avrflr

I believe the capacity of the tail fuel tank is...

I believe the capacity of the tail fuel tank is ~10,000 kgs. Certainly there was plenty of spare volume. The fuel in the tail is used to keep the center of gravity within safe limits, if you filled...
Forum: Tech Log
7th Feb 2008, 11:04
Replies: 15
Views: 2,426
Posted By avrflr

OK, I should have asked "why does the mass of...

OK, I should have asked "why does the mass of fuel required in the tail change?"

To give a specific example, the fuel load requested was 135,000 kgs with 3900 kgs in the tail. SG was 0.795. The...
Forum: Tech Log
6th Feb 2008, 19:42
Replies: 15
Views: 2,426
Posted By avrflr

B747-400 Tail Fuel Density

Why does the amount of fuel required in the tail change with SG? I asked a line maintenance bloke and he didn't have a clue.
Forum: Rumours & News
1st Feb 2008, 20:24
Replies: 451
Views: 289,964
Posted By avrflr

Fuel sample retention

It has been asserted that fuel samples would be retained at the bowser or hydrant. Does anyone know if that is SOP at PKG? It certainly isn't where I work - fuel samples are retained for each batch...
Showing results 1 to 26 of 26


 
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