Aviation medical certificates are a requirement for commercial pilots. The aspiring pilots need to pass an aviation medical examination to become a pilot legally. The examination is conducted by local CAA approved medical examiners. The examiners are typically the military and civil medical professionals who examine a persons mental and physical fitness. The applicant shall be required to be free of any abnormality, any disability, any injury from an operation, any effect or side-effect of medication taken as they are likely to interfere with the safe operation of an aircraft.