14 C.F.R. § 135.221 IFR: Alternate airport weather minimums.
Title 14 - Aeronautics and Space
No person may designate an alternate airport unless the weather reports or forecasts, or any combination of them, indicate that the weather conditions will be at or above authorized alternate airport landing minimums for that airport at the estimated time of arrival.
Title 14: Aeronautics and Space
PART 135—OPERATING REQUIREMENTS: COMMUTER AND ON DEMAND OPERATIONS AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT
Subpart D—VFR/IFR Operating Limitations and Weather Requirements
§ 135.221 IFR: Alternate airport weather minimums.
