14 C.F.R. § 23.1021 Oil system drains.
Title 14 - Aeronautics and Space
A drain (or drains) must be provided to allow safe drainage of the oil system. Each drain must— (a) Be accessible; (b) Have drain valves, or other closures, employing manual or automatic shut-off means for positive locking in the closed position; and (c) Be located or protected to prevent inadvertent operation. [Amdt. 23–29, 49 FR 6847, Feb. 23, 1984, as amended by Amdt. 23–43, 58 FR 18973, Apr. 9, 1993]
Title 14: Aeronautics and Space
PART 23—AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
Subpart E—Powerplant
Oil System
§ 23.1021 Oil system drains.
