Oil line and fittings in each designated fire zone must comply with § 121.259.
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14 CFR · PART 121
§ 121.237 Oil lines and fittings in designated fire zones.
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.