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Message
OK... now.. what about for fittings/aluminum lines that appear
NOT to be
subjected to flex loads but still on the engine. For instance,
running
from a rigidly mounted PSRU to the engine block..
I have used aluminum
lines for the oil drain, but it made me nervous. I've had a number of
cracks on aluminum tubing at the brake calipers where there is some
vibration. I currently have braided hose run from the drain fittings to
the foot of the rotor housing. These are AN6, and I used aluminum
fittings. I don't see this as being too much of a risk, but that doesn't
make it right.
The only certified point
of reference for ridged hose on an engine that I know of is the governor line
for a Lycoming. They use a ridged stainless tube for that.
I've also seen braided hose used, but never aluminum. Primer lines
tend to be copper, and they crack too. Basically, I wouldn't use aluminum
tubing.
Cheers,
Rusty
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