C.F.R. » Title 14 » CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER C—AIRCRAFT › PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES › Subpart E—Powerplant

14 C.F.R. § 25.957

Flow between interconnected tanks

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If fuel can be pumped from one tank to another in flight, the fuel tank vents and the fuel transfer system must be designed so that no structural damage to the tanks can occur because of overfilling.