{"data":{"id":"us/14-cfr-121.187","jurisdiction":"us","citation":"14 CFR 121.187","heading":"Airplanes: Reciprocating engine-powered: Landing limitations: Alternate airport.","body":"(a) No person may list an airport as an alternate airport in a dispatch or flight release unless the airplane (at the weight anticipated at the time of arrival at the airport), based on the assumptions in § 121.185, can be brought to a full stop landing, within 70 percent of the effective length of the runway.\n(b) This section does not apply to large nontransport category airplanes operated under § 121.173(c).","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER G—AIR CARRIERS AND OPERATORS FOR COMPENSATION OR HIRE: CERTIFICATION AND OPERATIONS","PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS","Subpart I—Airplane Performance Operating Limitations"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-14.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:20Z","sha256":"e66edaa9d9b5659e18df0275301ea362b75d755e1b5d8bb276caff001251e2ba","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-121.185","next":"us/14-cfr-121.189"},"notice":"GroundRules: Original legal text. Not legal advice."}