What evidence is typically required to certify an overhaul as airworthy?

• A. OEM-approved maintenance documentation, NDT results, measurements, photos, test run data, and authorized sign-offs.
• B. Vendor marketing materials.
• C. Pilot flight logs.
• D. Warranty claim forms.

Answer: (A)

When determining airworthiness after an overhaul, the key idea is that the overhaul must be shown to meet approved procedures and standards through a complete, auditable evidence package. The required materials include OEM-approved maintenance documentation that specifies exactly what was done and how, NDT results to verify structural integrity, measurements to confirm tolerances, photos for traceability of workmanship, test run data to prove functional performance, and authorized sign-offs to document accountability and compliance. Together, these elements demonstrate that the overhaul was performed to the approved data and is safe to return to service.

Vendor marketing materials don’t verify actual workmanship or compliance with approved procedures. Pilot flight logs show flight activity, not the validation of maintenance work. Warranty claim forms are about post-sale coverage, not certifying airworthiness after an overhaul.