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https://www.faa.gov/exit/?pageName=How%20to%20Pre%2DFlight%20an%20Airplane%2E&pgLnk=https%3A%2F%2Fwww%2Eaopa%2Eorg%2Ftraining%2Dand%2Dsafety%2Fstudents%2Fpresolo%2Fskills%2Fhow%2Dto%2Dpre%2Dflight%2Dan%2Dairplane