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Search: Posts Made By: NSEU
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Forum: Rumours & News
3rd Mar 2008, 01:02
Replies: 3,239
Views: 1,137,481
Posted By NSEU

"The fuel scavenge pumps (powered by pressure...

"The fuel scavenge pumps (powered by pressure from the main tank pumps) then start to transfer the muck to the main tanks."

Note that muck in the CT has to pass through an inlet screen before it...
Forum: Rumours & News
29th Feb 2008, 06:50
Replies: 3,239
Views: 1,137,481
Posted By NSEU

Note however... The trigger point for fuel pump...

Note however...
The trigger point for fuel pump low pressure switches can be as low as 4psi... The output of the boost pumps is, nominally, 12psi... so the pumps can, in theory operate down to...
Forum: Rumours & News
29th Feb 2008, 06:00
Replies: 3,239
Views: 1,137,481
Posted By NSEU

I can confirm Jetdoc's(?) statement that the (2)...

I can confirm Jetdoc's(?) statement that the (2) surge tank pressure relief valves have both positive and negative pressure relief. There is a description in the AMM on how to check the valve using...
Forum: Rumours & News
27th Feb 2008, 12:41
Replies: 3,239
Views: 1,137,481
Posted By NSEU

Never assume, Steve ;) Neither should...

Never assume, Steve ;)



Neither should anyone else.



Even if it did, it would only introduce air to one side of the aircraft ;)
Forum: Rumours & News
27th Feb 2008, 11:37
Replies: 3,239
Views: 1,137,481
Posted By NSEU

Can't find any reference to vent negative...

Can't find any reference to vent negative pressure relief regarding the surge tank vent valve in the Boeing 777 Maintenance Manual D&O. Is it mentioned in the (proper) AMM? Wouldn't the float valves...
Forum: Rumours & News
27th Feb 2008, 07:24
Replies: 3,239
Views: 1,137,481
Posted By NSEU

The fuel tanks NEED a slightly positive air...

The fuel tanks NEED a slightly positive air pressure to help stop the tank collapsing when fuel is being pumped out of the tanks. The vent system provides this positive pressure.

I don't see how a...
Forum: Rumours & News
26th Feb 2008, 00:44
Replies: 3,239
Views: 1,137,481
Posted By NSEU

The spar valves are contained within the wing...

The spar valves are contained within the wing tanks ;) Any leaks prior to the spar valve would possibly see fuel flow back into the wing tanks.

The leakage would have occured after the spar...
Forum: Rumours & News
24th Feb 2008, 23:52
Replies: 3,239
Views: 1,137,481
Posted By NSEU

I mentioned a similar scenario a few days ago,...

I mentioned a similar scenario a few days ago, but was shot down in flames....

As mentioned previously:
The scavenge plumbing tubing isn't large. It takes a long time for fuel to be scavenged. I...
Forum: Rumours & News
24th Feb 2008, 21:52
Replies: 3,239
Views: 1,137,481
Posted By NSEU

Many thanks to FullWings and Swedish Steve... ...

Many thanks to FullWings and Swedish Steve...

Again, this shows us that we are only as good as the (blurry) manuals available to us ;)

Cheers.
NSEU

(Edit) P.S. Does anyone find it kind of...
Forum: Rumours & News
24th Feb 2008, 02:10
Replies: 3,239
Views: 1,137,481
Posted By NSEU

Originally Posted by SyEng Re 2).......

Originally Posted by SyEng


Re 2).... This scenario seems very unlikely. Remember that with the crossfeed valves closed, each (L/R) CT pump feeds its respective engine. the control of the CT...
Forum: Rumours & News
24th Feb 2008, 00:46
Replies: 3,239
Views: 1,137,481
Posted By NSEU

Swedish Steve said: Steve.... I...

Swedish Steve said:



Steve....
I think I'm looking at the same blurry picture from the AMM, but enlarging it, I don't see the CT water scavenge system hooked up to wing tank pumps. So, with...
Forum: Rumours & News
22nd Feb 2008, 11:08
Replies: 3,239
Views: 1,137,481
Posted By NSEU

From a previous post in another thread on this...

From a previous post in another thread on this issue....

Quote:
Many, many years go, when I was a young pilot, there was an incident in where I live, with Airbus A300's. Company was Karair, at...
Forum: Rumours & News
22nd Feb 2008, 06:58
Replies: 3,239
Views: 1,137,481
Posted By NSEU

This also surprised me when I read it in the...

This also surprised me when I read it in the Boeing 777 Maintenance Manual. I quoted it in an earlier forum posting, but I was hesitant. I really wanted to get more information from a higher source....
Forum: Rumours & News
21st Feb 2008, 20:42
Replies: 3,239
Views: 1,137,481
Posted By NSEU

This has been mentioned before. Apparently it's...

This has been mentioned before. Apparently it's part of normal QAR ops. It's not a continuous recording system like the CVR and DFDR.
The recording system collates data and dumps it onto the QAR...
Forum: Rumours & News
21st Feb 2008, 20:19
Replies: 3,239
Views: 1,137,481
Posted By NSEU

The EEC commands the FMU Fuel Metering Valve to a...

The EEC commands the FMU Fuel Metering Valve to a certain position and a feedback resolver on the metering valve sends a signal back to the EEC (closed loop).

I assume the "FMV" position data...
Forum: Rumours & News
21st Feb 2008, 08:31
Replies: 3,239
Views: 1,137,481
Posted By NSEU

Sounds awfully like you're trying to compare this...

Sounds awfully like you're trying to compare this to a GE engine, Sven?

The Rolls Royce Trent has a fuel pump and a Fuel Metering Unit. The pump is mechanically driven. The FMU is further...
Forum: Rumours & News
21st Feb 2008, 08:18
Replies: 3,239
Views: 1,137,481
Posted By NSEU

What kind of simulator are we talking about...

What kind of simulator are we talking about here... a flight simulator or a Boeing design program? The flight simulator would have to model damage to specific wiring (I know Level D sims are...
Forum: Rumours & News
20th Feb 2008, 07:41
Replies: 3,239
Views: 1,137,481
Posted By NSEU

The CWT pumps put out more pressure/flow than the...

The CWT pumps put out more pressure/flow than the wing pumps. Low pressure output at the CWT either due to the pumps being switched off or due to no fuel in the tank will cause the check valves on...
Forum: Rumours & News
20th Feb 2008, 07:00
Replies: 3,239
Views: 1,137,481
Posted By NSEU

On reflection, I think we can safely ignore the...

On reflection, I think we can safely ignore the bits and pieces in the tanks as causes of fuel starvation (scraper, paper, etc). Remember that there are 2 pumps in EACH tank. All four tank pump...
Forum: Rumours & News
19th Feb 2008, 00:53
Replies: 3,239
Views: 1,137,481
Posted By NSEU

Sorry, I thought you (or someone else) was saying...

Sorry, I thought you (or someone else) was saying that leaky seals were the root cause of the cavitation problem.... rather than a blockage downstream. Yes, I suppose air might get in through leaky...
Forum: Rumours & News
18th Feb 2008, 23:19
Replies: 3,239
Views: 1,137,481
Posted By NSEU

Re the references to JetA1 in the report.... ...

Re the references to JetA1 in the report....

Would this be because the fuel loaded in Heathrow was Jet A1 and flight crews are told, where there are combinations of fuel types in tanks, to enter...
Forum: Rumours & News
18th Feb 2008, 23:02
Replies: 3,239
Views: 1,137,481
Posted By NSEU

In light of the first reports, I took the last...

In light of the first reports, I took the last report to indicate that, prior to the event (during the normal part of flight down to 700'), the crossfeeds were not activated.
As previously...
Showing results 1 to 22 of 22


 
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