14 C.F.R. § 121.179 Airplanes: Reciprocating engine-powered: En route limitations: All engines operating.
Title 14 - Aeronautics and Space
(a) No person operating a reciprocating engine powered airplane may take off that airplane at a weight, allowing for normal consumption of fuel and oil, that does not allow a rate of climb (in feet per minute), with all engines operating, of at least 6.90 V (b) This section does not apply to airplanes certificated under part 4a of the Civil Air Regulations. (c) This section does not apply to large nontransport category airplanes operated under §121.173(c). [Doc. No. 6258, 29 FR 19198, Dec. 31, 1964, as amended by Amdt. 121–251, 60 FR 65928, Dec. 20, 1995]
Title 14: Aeronautics and Space
PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS
Subpart I—Airplane Performance Operating Limitations
§ 121.179 Airplanes: Reciprocating engine-powered: En route limitations: All engines operating.