Which weather condition triggers FO restrictions for takeoffs and landings?

• A. Reported or actual weather is worse than CAT I IFR
• B. Reported or actual weather is less than CAT I IFR
• C. VMC
• D. Clear skies

Answer: (B)

Weather minima for takeoff and landing set the standard for when flight operations under instrument rules can be conducted. CAT I IFR minima typically require about 1000 ft of ceiling and 3 miles of visibility. When the reported or actual weather is below those minimums, standard FO (flight operations) takeoffs and landings can’t be performed safely under the normal procedures, so restrictions are triggered. In other words, conditions below CAT I minima require applying higher minimums or delaying the operation, rather than proceeding with standard takeoffs/landings. By contrast, VMC or clear skies indicate favorable conditions that do not trigger those restrictions, since they allow visual operations rather than instrument-based ones.