14 CFR §135.395
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
No person may select an airport as an alternate airport for a large nontransport category airplane unless that airplane (at the weight anticipated at the time of arrival), based on the assumptions in § 135.393(b), can be brought to a full stop landing within 70 percent of the effective length of the runway.