Enough quick-acting fire detectors must be provided in each designated fire zone to assure the detection of any fire that may occur in that zone.
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14 CFR · PART 121
§ 121.273 Fire-detector systems.
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.