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Forum: Rumours & News

20th Mar 2009, 11:06

Replies: 3,239

BA038 (B777) Thread

Views: 1,137,521

Posted By Dak Man

Tanimbar

Nothing untoward.

This table you mentioned seems a bit suspicious to me.

As I've said the engine fuel system is designed to accept fuel (with 260ppm of water present) at the LP inlet down to...

Forum: Rumours & News

20th Mar 2009, 09:31

Replies: 3,239

BA038 (B777) Thread

Views: 1,137,521

Posted By Dak Man

Tanimbar

Fuel systems are routinely Qualification tested with fuel temperatures down to -54°C in the tank and -45°C at the LP inlet. It's fuel in the region of -8°C that is causing the headaches.

Forum: Rumours & News

20th Mar 2009, 09:11

Replies: 3,239

BA038 (B777) Thread

Views: 1,137,521

Posted By Dak Man

Sooty GE90 Architecture

ImageShack - Image Hosting :: ge90dacb777.tif (http://img25.imageshack.us/my.php?image=ge90dacb777.tif)

Indeed Sooty the GE90 does have an interstage LP filter which would go into bypass if...

Forum: Rumours & News

19th Mar 2009, 19:01

Replies: 3,239

BA038 (B777) Thread

Views: 1,137,521

Posted By Dak Man

Perhaps my post was slightly misleading, there is...

Perhaps my post was slightly misleading, there is no hottest or coldest fuel "end", the fuel temp is what it is and is largely uniform as it enters the FCOC, again remember that it's an oil cooler -...

Forum: Rumours & News

19th Mar 2009, 09:08

Replies: 3,239

BA038 (B777) Thread

Views: 1,137,521

Posted By Dak Man

Sooty

This is a normal arrangement, LP Pump - Oil Cooler - LP filter (with bypass) - HP Pump. Nothing unusual in that system and it's comon to all 3 big manufacturers.

Again, where T800 is different is...

Forum: Rumours & News

18th Mar 2009, 12:14

Replies: 3,239

BA038 (B777) Thread

Views: 1,137,521

Posted By Dak Man

Some clarification. T800 is not likely to...

Some clarification.

T800 is not likely to have a heater matrix bypass installed as part of the FOHE, the modification concerns creating a flush fitting matrix where ice cannot accrete to the...

Forum: Rumours & News

13th Mar 2009, 14:47

Replies: 3,239

BA038 (B777) Thread

Views: 1,137,521

Posted By Dak Man

If it hadn't been for B777, T800 would have been...

If it hadn't been for B777, T800 would have been cancelled, the SIA order saved it.

Also, BA, traditionally a RR customer specified GE90 for it's initial B777 order. This was unashamedly done as...

Forum: Rumours & News

13th Mar 2009, 10:43

Replies: 3,239

BA038 (B777) Thread

Views: 1,137,521

Posted By Dak Man

The issue is the amount of protrusion of the...

The issue is the amount of protrusion of the heater matrix tubes above their support plate within the FOHE. These are notoriosly difficult to manufacture and the protrusion height is largely driven...

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