| Re: BA LHR 777 Crash - AD pending |
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Group: aus.aviation · Group Profile
Author: David LesherDavid Lesher Date: Sep 10, 2008 07:36
Paul Saccani omen.net.au> writes:
>I also think you may have misinterpreted the report slightly. It
>doesn't inject scavenge into the boost pumps, but rather, near their
>inlets. This entrains fuel into that flow as well, so you shouldn't
>have solid slugs of heavily water contaminated fuel entering the boost
>pump inlets. Additionally, the tendency is for gross amounts of water
>to cause icing in the scavenge pumps which stops their operation (this
>usually doesn't damage the scavenge pumps).
I found it interesting because usually the idea is to keep the water
out of combustion engines, not send it there. I agree that in very
low percentages, it won't disrupt combustion -- some engines actually
intentionally inject H2O, the HP7 and early B52's among them..
BUT fuel system icing is the topic at hand, and water+cold often equals
ice.
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