Sec. 29.999 - Fuel system drains.
(a) There must be at least one accessible drain at the lowest point in
each fuel system to completely drain the system with the rotorcraft in any
ground attitude to be expected in service.
(b) Each drain required by paragraph (a) of this section including the
drains prescribed in §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 easily opened and
(ii) That is either located or protected to prevent fuel spillage in
the event of a landing with landing gear retracted.
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as amended by Amdt.
29-12, 41 FR 55473, Dec. 20, 1976; Amdt. 29-26, 53 FR 34218, Sept. 2,