Text in force at CS29-12: from CS29-0, effective 14 Nov 2003.
(a) There m ust be at least one accessible drain at the lowest point in each fuel system to completely d rain th e system with th e ro torcraft in any ground attitude to be expected in service.
(b) Each drain required by sub-paragraph (a) including the drains prescribed in CS 29.971 must:
(1) Discharge clear of all parts of the rotorcraft;
(2) Have manual or automatic means to ensure positive closure in the off position; and
(3) Have a drain valve:
(i) That is readily accessible and which can be easi ly opened and closed; and
(ii) That is eith er located or protected to prevent fu el sp illage in th e event of a l anding with landing gear retracted.
ED Decision 2003/016/RM · Source