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owls :''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.〔Kaiser, John W.: ''How to Fly Book - Cessna 150'', page 37. Victoria Flying Club, 1977.〕 Like all mnemonics this check has become part of aviation culture and folklore. OWLS:〔 * Obstacles * Wind direction * Length of surface * Surface condition and type ==References==
 
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