CPL Navigation · Practice

A STAR shows 'AT or BELOW FL180' at waypoint GOLF. An aircraft arrives at GOLF at FL185. Is this compliant?

• A.Yes — FL185 is within 500 ft, within normal altimeter tolerance
• B.Yes — AT or BELOW constraints on STARs are advisory unless ATC enforces them
• C.No — FL185 is above the AT or BELOW FL180 constraint; the aircraft has violated the procedure
• D.No — but only if ATC has not issued a clearance for that level