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Search: Posts Made By: Jetdoc
Showing results 1 to 18 of 18
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Forum: Rumours & News
3rd Mar 2008, 08:50
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

I think we should all remember that the scavenge...

I think we should all remember that the scavenge system does not feed the remains of the center tank directly into the main tank boost pump pickups but rather it stirs up the fuel around the pickup.
Forum: Rumours & News
2nd Mar 2008, 17:15
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

777fly The suction pipe is really not all...

777fly

The suction pipe is really not all that long. Just imagine the pipe with a screen on the end of it similar to the boost pump pickups. Its attached directly to the engine feed manifold. The...
Forum: Rumours & News
2nd Mar 2008, 08:11
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

The bypass valves are simply check valves or non...

The bypass valves are simply check valves or non return valves. They are held closed by fuel pressure from the tank boost pumps. If the tank boost pumps are off and the crossfeed valves are closed so...
Forum: Rumours & News
2nd Mar 2008, 03:19
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

The output of the boost pumps will be added to...

The output of the boost pumps will be added to the atmospheric pressure. Its always implied that we are talking about values above atmospheric pressure because it acts across the whole system- input...
Forum: Rumours & News
28th Feb 2008, 04:48
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

The refuel valves are solenoid controlled from...

The refuel valves are solenoid controlled from the refuel panel and they require fuel pressure to push them open. That fuel pressure is supplied by the pumper truck or when the aircraft is on the...
Forum: Rumours & News
28th Feb 2008, 02:38
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

B777fly The aircraft is refuelled through...

B777fly

The aircraft is refuelled through separate refuelling valves. There are 2 in each tank and they are not powered in flight.
Forum: Rumours & News
27th Feb 2008, 18:11
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

B777fly The drawings I gave to bsieker...

B777fly

The drawings I gave to bsieker represent typical installations on Boeings. They are actually from my B757 notes. If you look at the pump installation, thats how the jettison pump would...
Forum: Rumours & News
27th Feb 2008, 18:01
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

Bsieker Thanks for posting those drawings....

Bsieker

Thanks for posting those drawings. I hope they give some people an understanding of the components in the fuel system. They give some details of what the pump installations, pickup points...
Forum: Rumours & News
27th Feb 2008, 17:50
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

B777fly From the B777 AMM A discharge...

B777fly

From the B777 AMM
A discharge check valve is installed in the pump housing for each fuel boost pump, override/jettison pump and jettison pump. The discharge check valve prevents the flow...
Forum: Rumours & News
27th Feb 2008, 14:41
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

B777fly All of the boost and ovrd/jett...

B777fly

All of the boost and ovrd/jett pumps on the aircraft are centifugal pumps. The air and fuel separation occurs as a result of pump action. The inlet to the pump is screened at the pump...
Forum: Rumours & News
27th Feb 2008, 12:29
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

A couple of points: 1. The pressure relief...

A couple of points:
1. The pressure relief valve is illustrated in the pressure refuel ref AMM 28-21-00 or storage ref AMM 28-10-00.
"An open pressure relief valve is a symptom of a blocked vent...
Forum: Rumours & News
27th Feb 2008, 08:23
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

I have some drawings but I have no way to post...

I have some drawings but I have no way to post them here. Anyone who has a means of posting them is welcome to them.
The vent system has more than one channel on large transport aircraft and it is...
Forum: Rumours & News
27th Feb 2008, 07:11
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

Both the boost pumps and ovrd/jett pumps are...

Both the boost pumps and ovrd/jett pumps are designed to provide vapour free fuel to the engines. The air is returned to the tank and the fuel goes to the engine. The outlets of the pumps which all...
Forum: Rumours & News
26th Feb 2008, 01:45
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

Quote: Jetdoc, You say you"cant imagine...

Quote:
Jetdoc,
You say you"cant imagine anything going on prior to touchdown" before landing .I cant believe you fly.

Actually, you are right. I do not fly. I am an aircraft maintenance...
Forum: Rumours & News
25th Feb 2008, 17:42
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

This is from a previous post I made: I am...

This is from a previous post I made:

I am not sure if it has been mentioned before, but in addition to the 2 fuel pumps in each main tank, there is a pump bypass valve in the left and right tanks...
Forum: Rumours & News
25th Feb 2008, 17:09
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

Quote: When you shut an engine down using the...

Quote:
When you shut an engine down using the spar valves it runs for 30-50secs on the fuel in the pylon, so from the boost pimps it will probably run for about 2 minutes.


I fully disagree...
Forum: Rumours & News
24th Feb 2008, 10:46
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

I just wanted to repost my comment that i made...

I just wanted to repost my comment that i made yesterday. It seemed to have been buried under a bunch of posts on EMI and computers that are not even installed on B777s. I just wanted to add a couple...
Forum: Rumours & News
23rd Feb 2008, 12:40
Replies: 3,239
Views: 1,137,490
Posted By Jetdoc

I am not sure if it has been mentioned before,...

I am not sure if it has been mentioned before, but in addition to the 2 fuel pumps in each main tank, there is a pump bypass valve in the left and right tanks that allow the engine driven fuel pump...
Showing results 1 to 18 of 18


 
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