Which document is used to record and authorize return to service of major alterations and repairs?

Which document is used to record and authorize return to service of major alterations and repairs?

• A. logbook entry
• B. airworthiness certificate
• C. service bulletin
• D. FAA form 337

Answer: (D)

FAA Form 337 is used to record and authorize the return to service after major alterations or repairs. It provides a formal description of the work performed, references the installation data or drawings, and captures the approvals needed from the person who performed the work and from the FAA or a DER. Once approved, it becomes part of the aircraft’s permanent records and authorizes return to service. Other documents have different roles: a logbook entry tracks routine maintenance but doesn’t authorize major work or release for flight; an airworthiness certificate proves an aircraft is airworthy but isn’t a record of specific alterations; a service bulletin is a manufacturer’s recommendation and may require action, but it does not itself serve as the authorization for return to service.

FAA Form 337 is used to record and authorize the return to service after major alterations or repairs. It provides a formal description of the work performed, references the installation data or drawings, and captures the approvals needed from the person who performed the work and from the FAA or a DER. Once approved, it becomes part of the aircraft’s permanent records and authorizes return to service. Other documents have different roles: a logbook entry tracks routine maintenance but doesn’t authorize major work or release for flight; an airworthiness certificate proves an aircraft is airworthy but isn’t a record of specific alterations; a service bulletin is a manufacturer’s recommendation and may require action, but it does not itself serve as the authorization for return to service.