After a mechanic holding an airframe and powerplant rating completes a 100-hour inspection, what action is required before the aircraft is returned to service?

Question

BlackTom AI · Accepted Answer

A proper entry in the aircraft maintenance record is required because FARs mandate documentation of inspections and the approval for return to service.

1) Relevant knowledge points and concepts
- 14 CFR 91.409 and 14 CFR 43.11 govern 100‑hour inspections and maintenance recordkeeping. 
- 14 CFR 43.3/43.7 define who may approve an aircraft for return to service (a certificated A&P mechanic for a 100‑hour inspection). 
- 14 CFR 43.11 prescribes the content of maintenance record entries: description of work, date, aircraft total time in service (and/or tach time), name, signature, certificate number, and kind of certificate of the person approving the work; and for inspections, an explicit statement that the aircraft has been inspected and is approved for return to service.

2) Step‑by‑step reasoning
- The mechanic performs the 100‑hour inspection and either signs off that no discrepancies exist or corrects any discrepancies found. 
- Before the aircraft may be flown again, the certificated mechanic who performed/approved the inspection must document the work and approval. 
- The required documentation is placed in the aircraft’s maintenance records (logbooks), not by a separate FAA form or external notification.

3) Intermediate steps / required entry elements
- List the inspection performed (e.g., “100‑hour inspection completed per FAR 91.409/43.11”), date of completion, aircraft total time in service, signature of the mechanic, mechanic’s certificate number, and type of certificate (A&P). Include a statement approving the aircraft for return to service.

4) Why the correct answer is correct
- The regulations explicitly require these logbook entries as the action that authorizes return to service after a 100‑hour inspection. Without that entry, there is no legal approval documented.

5) Why other possible answers are incorrect (brief)
- Posting a placard, notifying the FAA, or any informal note does not satisfy 14 CFR 43.11. No special FAA form beyond standard maintenance records is required for a routine 100‑hour inspection; only the proper maintenance‑record entry and signature by an authorized person are required.

6) Conclusion
- Therefore, the required action before returning the aircraft to service is to make the proper entries in the aircraft’s maintenance record, which matches the provided correct answer.

After a mechanic holding an airframe and powerplant rating completes a 100-hour inspection, what action is required before the aircraft is returned to service?Single choice

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