Disqualification for an FAA-certified aviation mechanic (A&P) primarily stems from legal, medical, or ethical violations. Legally, any conviction related to the "fraudulent reproduction, alteration, or falsification" of aircraft records is a permanent disqualifier, as the role relies on absolute integrity. Additionally, a history of drug or alcohol-related offenses can lead to the denial or revocation of a certificate, especially if it indicates a substance abuse problem that could impair judgment during safety-critical tasks. While there is no standard "medical certificate" like those for pilots, a mechanic can be disqualified if they possess a physical or mental condition—such as severe vision impairment that cannot be corrected, color blindness that prevents identifying colored wiring, or certain neurological conditions—that makes them unable to safely perform the duties of the job. Finally, failing the required knowledge or practical tests, or having a history of major safety "violations of the Federal Aviation Regulations," can lead to a suspension or permanent barring from the profession.