Aluminum AN fittings

Aluminum AN fittings

<HTML>I have been told it is better to use steel fittings on the engine due to vibration as the aluminum AN fittings might crack.  Does any one know of a case where an aluminum fitting cracked due to vibration?  There is such a large difference in weight I'd rather use aluminum but of course safety comes first.

Thanks in advance.

Larry J.</HTML>

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Re: Aluminum AN fittings

<HTML>The amount of weight involved in the entire airplane's complement of such fittings is negligible no matter which material it is made of, so that should not be your primary consideration.  The primary consideration should be the purpose of the fitting and the material it is transporting.  In a low temperature, low pressure application carrying non-corrosive fluids and gases (air), then aluminum is satisfactory.  High temperature, high pressure, or corrosive fluids and gases should be serviced with steel fittings.  Examples of the latter are: hydraulic pressure lines, brake lines, fuel lines, manifolds, etc.  An exception to the high pressure rule would be oxygen lines which should be serviced with either aluminum or (preferably) brass.  Even low pressure/low temp service should consider steel fittings if the appliance is also steel, to avoid electrolysis.</HTML>

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Re: Aluminum AN fittings

<HTML>I recently found a cracked aluminum AN fitting. Located on a cessna 185 electric fuel boost pump. Factory fitting, I believe.</HTML>

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