Text in force at 23-63: from 23-15, effective 31 Oct 1974.
Each oil tank must be tested under Sec. 23.965, except that--
(a) The applied pressure must be five p.s.i. for the tank construction instead of the pressures specified in Sec. 23.965(a);
(b) For a tank with a nonmetallic liner the test fluid must be oil rather than fuel as specified in Sec. 23.965(d), and the slosh test on a specimen liner must be conducted with the oil at 250� F; [and (c) For pressurized tanks used with a turbine engine, the test pressure may not be less than 5 p.s.i. plus the maximum operating pressure of the tank.]
39 FR 35460 · Source