14 C.F.R. § 25.1021 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; and (b) Have manual or automatic means for positive locking in the closed position. [Amdt. 25–57, 49 FR 6848, Feb. 23, 1984]
Title 14: Aeronautics and Space
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart E—Powerplant
Oil System
§ 25.1021 Oil system drains.
