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I don't recall where I read it (I checked several references but couldn't
locate it) but the reason for steel fittings on oil lines is to prevent
cracking of the fittings under vibration.  This would presumably apply to all
fittings attached to the vibrating engine, whether the line contains fuel or
oil.

Also, use only flexible lines between the moving engine and the non-moving
firewall, and this means oil cooler lines, fuel lines, etc.  If both ends of
the line are on the engine, or both ends are on the firewall, then a hard
line is okay.

Finally, use a restrictor fitting in your oil pressure sense line, since a
broken line would otherwise result in pumping all the oil out.

Tony Bingeles' book "Firewall Forward" says to use steel fittings with steel,
well, he means both halves (male and female) of the fitting should be of the
same material.  I notice we didn't do this with our hydraulic systems, as the
kits come with steel fittings for the flex lines and aluminum bulkhead and
elbow fittings.  I'm not worried about that.

If someone could find a reference for all this I'd appreciate it.  I looked
in the Sacramento Sky Ranch Engineering Manual, Firewall Forward (Bingelis),
the Sportplane Builder (Bingelis), AC 43.13, the Standard Aircraft Handbook,
and the Aircraft Spruce catalog and couldn't find it.

- Rob Wolf
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