What are airport operational standards and flight procedures

Airport Operational Minimum Standards - Operational limitations that an airport can use for aircraft takeoffs and landings. For takeoffs, this is expressed in terms of visibility (VIS) or runway visual range (RVR).

(Takeoff minimums are usually expressed in terms of visibility only. However, when it is necessary to see and avoid an obstacle during takeoff and departure, the takeoff minimums should include visibility and cloud height, and the exact location of that obstacle should be indicated on the published departure procedure chart. In addition, takeoff minimums may only be expressed in terms of visibility only if an instrument departure procedure specifies a minimum climb gradient required to safely overfly the obstacle and the aircraft is capable of meeting the specified climb gradient.)

Cloud heights should also be included when required; for precision approach landings, expressed in terms of visibility (VIS) or runway visual range (RVR) and decision altitude draft (DA/DH), depending on the operational classification, and for non-precision approach landings, expressed in terms of visibility (VIS) and minimum descent altitude/height (MDA/MDH).