Accessible drains incorporating either a manual or automatic means for positive locking in the closed position must be provided to allow safe drainage of the entire oil system.
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14 CFR · PART 125
§ 125.139 Oil system drains.
Official text · Current as of Oct 19, 2026 · from eCFR
Not legal advice. This is the official text as published in the eCFR, which is updated daily but is not the legal edition. For legal purposes, use the annual Code of Federal Regulations or ask an aviation attorney.