FAA PART 97  STANDARD INSTRUMENT APPROACH PROCEDURES

§ 97.3   Symbols and terms used in procedures.

(a) A means alternate airport weather minimum.

(s) S means straight-in landing minimum, a statement of ceiling and visibility, minimum descent altitude and visibility, or decision height and visibility, required for a straight-in landing on a specified runway. The number appearing with the S indicates the runway to which the minimum applies. If a straight-in minimum is not prescribed in the procedure, the circling minimum specified applies to a straight-in landing.

(v) T means takeoff minimum.

(x) Visibility minimum means the minimum visibility specified for approach, or landing, or takeoff, expressed in statute miles, or in feet where RVR is reported.

(e) Ceiling minimum means the minimum ceiling, expressed in feet above the surface of the airport, required for takeoff* or required for designating an airport as an alternate airport.

 

FAA Part

 Takeoff Minimums Alternate (airport) Minimums

91

 P§ 91.175   Takeoff and landing under IFR.
For all other part 91 operations and parts 121, 125, 129, and 135 operations, the flight visibility is less than the visibility prescribed in the standard instrument approach procedure being used.		 § 91.1039   IFR takeoff, approach and landing minimums.
(d) No person may take off an aircraft under IFR from an airport where weather conditions are at or above takeoff minimums but are below authorized IFR landing minimums unless there is an alternate airport within one hour's flying time (at normal cruising speed, in still air) of the airport of departure.
135
§ 135.217   IFR: Takeoff limitations.
No person may takeoff an aircraft under IFR from an airport where weather conditions are at or above takeoff minimums but are below authorized IFR landing minimums unless there is an alternate airport within 1 hour's flying time (at normal cruising speed, in still air) of the airport of departure.
 		§ 135.221   IFR: Alternate airport weather minimums.
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.
121
§ 121.651   Takeoff and landing weather minimums: IFR: All certificate holders.
 ...reports the visibility to be equal to or more than the visibility minimums prescribed for that procedure.
§ 121.625   Alternate airport weather minimums.
No person may list an airport as an alternate airport in the dispatch or flight release unless the appropriate weather reports or forecasts, or any combination thereof, indicate that the weather conditions will be at or above the alternate weather minimums specified in the certificate holder's operations specifications for that airport when the flight arrives.