Text in force at 29-59: from 29-26, effective 3 Oct 1988.
[Each suction lift fuel system and other fuel systems conducive to vapor formation must be shown to operate satisfactorily (within certification limits) when using fuel at the most critical temperature for vapor formation under critical operating conditions including, if applicable, the engine operating conditions defined by Sec. 29.927(b)(1) and (b)(2).]
53 FR 34217 · Source