What is grounds for revoking a flight engineer's airman certificate?

The correct choice, which identifies grounds for revoking a flight engineer's airman certificate, pertains to any alteration of the certificate itself. Altering an airman certificate undermines the integrity and validity of the document. The regulatory framework surrounding aviation emphasizes the importance of authenticity in all certifications, as they serve both to verify an individual's qualifications and to ensure safety within the aviation industry.

When a flight engineer's certificate is altered, it poses a significant concern not only for compliance with regulations but also for the safety and trust within the aviation system. Such actions can lead to disciplinary measures, including the revocation of the certificate.

While factors such as failure to maintain recency of experience, involvement in a safety incident, and neglecting to report for duty are all serious issues that may lead to severe consequences, they do not inherently represent the same level of violation as altering the certification itself. The integrity of the certification is paramount, and any tampering directly violates established protocols and regulations that govern airman credentials.