How can an airworthiness certificate become invalid?

• A. If the pilot violates airspace rules
• B. If the aircraft is not in a condition for safe operation or fails to meet its type design or current airworthiness requirements
• C. If the maintenance was performed by an uncertified mechanic
• D. If the airplane has too many flight hours

Answer: (B)

The certificate shows the aircraft is airworthy only while the airplane remains in a condition for safe operation and continues to meet its approved design and current airworthiness requirements. If the aircraft develops a condition that makes it unsafe to fly, or if any maintenance, repairs, or alterations take it away from the approved type design or violate current airworthiness directives and inspection rules, it no longer meets those requirements and the airworthiness certificate is no longer valid. This means that ongoing conformity to the design and safety standards is what keeps the certificate in effect. Regulatory issues like airspace violations or simply counting flight hours aren’t by themselves what makes the certificate invalid. Likewise, maintenance done by an uncertified mechanic could lead to an unairworthy condition if the work isn’t performed to the required standards, but the key point is whether the aircraft still conforms to its design and is safe to operate.