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CAUTION - AEROQUIP 601 HOSE LEAKSFrom CP52, Page 5 (July, 1987)
We have yet another report
of one of these rubber, reinforced-with-stainless-steel, outer, braid hoses that has
suddenly sprung a massive leak. Again, it happened after the airplane had not been flown
for a while. Our own experience with the Grizzly was that the airplane was not used for
almost one year, then when we turned on the fuel valve and the boost pump, fuel ran out of
the cowling just as though a line had been removed. A fuel line, an Aeroquip 601, was
leaking at one of the fittings. This hose had never leaked before and no one had touched
it between flights. We have now heard from at least four builders with this problem.
Here at RAF, we have gone over to Stratoflex Teflon hoses and we
order them made up to the length we want. We have them pressure checked and have fire
sleeves installed on each fuel line. These fuel lines are more expensive but we believe
they are a much safer way to go. We have been getting our hoses from Aircraft Spruce and
they are available from dash-3 to dash-8.
Check all your hoses aft of the firewall, both oil lines and fuel
lines, frequently, especially if you have Aeroquip 601 hoses and even more frequently if
you made be considered one of the most hazardous situations that these up yourself. A fuel
leak aft of the firewall must can occur and must be taken care of before it happens while
airborne. Replace any suspect fuel/oil lines. Have them pressure tested and have fire
sleeves installed on each line.