Within the United States, each certificate holder (or person performing maintenance or preventive maintenance functions for it) shall relieve each person performing maintenance or preventive maintenance from duty for a period of at least 24 consecutive hours during any seven consecutive days, or the equivalent thereof within any one calendar month.
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14 CFR · PART 121
§ 121.377 Maintenance and preventive maintenance personnel duty time limitations.
Official text · Current as of Oct 19, 2026 · from eCFR
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