Federal Aviation Regulations
Sec. 27.1021 — Oil system drains.
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. 27–20, 49 FR 6849, Feb. 23, 1984]
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