14 C.F.R. § 121.205 Nontransport category airplanes: Landing limitations: Alternate airport.
Title 14 - Aeronautics and Space
No person may list an airport as an alternate airport in a dispatch or flight release for a nontransport category airplane unless that airplane (at the weight anticipated at the time of arrival) based on the assumptions contained in §121.203, can be brought to a full stop landing within 70 percent of the effective length of the runway.
Title 14: Aeronautics and Space
PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS
Subpart I—Airplane Performance Operating Limitations
§ 121.205 Nontransport category airplanes: Landing limitations: Alternate airport.
