Code of Federal Regulations · Section
§ 125.143 — Firewalls
14 C.F.R. § 125.143
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Each engine, auxiliary power unit, fuel-burning heater, or other item of combusting equipment that is intended for operation in flight must be isolated from the rest of the airplane by means of firewalls or shrouds, or by other equivalent means.
Authorizing Statute
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Federal Aviation Administration49 U.S.C. § 106