BA 777 crash at Heathrow

Big John wrote in
:

On Tue, 18 Mar 2008 03:33:41 +0000 (UTC), Bertie the Bunyip
wrote:

Tina wrote in
news:f9919557-7cf1-4224-86c4-
:

Isn't it stretching things to think it would happen to both engines
at the same time when they are drawing from two different tanks?
That's stacking a lot of "If's" in a row.



It's not an if. When kerosene gets cold enough it waxes. Both tanks
were exposed to the same temps for many hours. Probably somthing in
the region of -65 C.


Bertie
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Bertie

Before the Airlines started flying jets the Air Force ran into a fuel
problem in their jets at altitude. Can't remember now if it was ice
xtyls forming in the fuel or waxing as you say but the Air Force
started putting an additive in their fuel that stopped that problem
and the Airlines picked up on it when they started flying jets I was
told.

The basic problem was that the xtyls would form in the fuel and then
pack the filter and stop fuel flow.

Do the Airlines still use the/a additive in their fuel for the high
altitude problem?



Dunno. I know they used to put at least one additive in that had to be
added as the fuel was loaded. Prist was one such producet. but I've
never had anything like that added. whatever formula the fuel is made to
arrives at the airplane like that. I don't normally do flight long
enough or at lattitudes high enough to get fuel icing. I did have a
pretty exciting blocakge due to ice in avgas once, but never with
kerosene. I guess the lowest fuel temp I've seen is about -25C

Hope you had a good St Paddies day )

Working!

Erin go bre

Go Ma

Bertie