Plastic Tubing No-No

Unairworty.

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The symptom was a static system that leaked like a sieve when tested. Further investigation discovered this AN fitting being used with plastic tubing.

AN fittings are meant for hard aluminum/copper/steel lines where a flare of the tubing is required to make a seal.

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Vic is a fixed-wing and helicopter commercial pilot, CFII with ASMEL/ASES ratings, an A&P/IA, DAR, and EAA technical advisor and flight counselor. Passionately involved in aviation for over 40 years, he has built 11 aircraft and logged over 10,000 hours in 72 different kinds of aircraft. Vic volunteers as a Young Eagle pilot, has his own sport aviation business called Base Leg Aviation, and has written two books on aircraft prebuy and condition inspections.

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