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Theo:

To answer your questions:

Galvanic corrosion is only an issue when there is an electrolyte present.

On my plane I saved about 1.5 lbs. The difference between an aluminum and
steel -4 nut and sleeve is about 10 grams. It adds up. Just like using
MS21042 stopnuts instead of AN365s or aluminum AN washers instead of steel.

DEL seals should only be used when you can't replace the line or fitting.
They are a repair and should not ne "designed in".

Regards
Brent Regan

<<Brent : a question regarding the AL fittings. I take it galvanic corrosion
is
not an issue, even if the anodized coating gets rubbed off? Also, how much
weight are you saving by not using steel parts? Finally, what do you think
about
the DEL seals (or equivalent) used in flared fittings?>>

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