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- For the Harry Potter scenario fictional examinations, see Hogwarts#Grading and assessment. For the birds see owl.
OWLS is a mnemonic used by general aviation airplane pilots to assess an unprepared surface for a precautionary landing.
Like all mnemonics this check has become part of aviation culture and folklore.
- Wind direction
- Length of surface
- Surface condition and type
- ^ a b Kaiser, John W.: How to Fly Book - Cessna 150, page 37. Victoria Flying Club, 1977.