Every certificated civil aircraft operating in the United States must undergo a thorough annual inspection at intervals not exceeding twelve calendar months. But completing the physical inspection is only half the job. The regulatory framework that governs aircraft maintenance — primarily 14 CFR Part 43 — requires that the results of every annual inspection be formally recorded in the aircraft's maintenance records. A technically perfect inspection that lacks a proper logbook entry is, from a legal standpoint, as if the inspection never happened. For the Aviation Maintenance Technician (AMT) working toward the General knowledge test, mastering the rules surrounding annual inspection sign-offs and logbook entries is essential both for the exam and for a safe, compliant maintenance career.
This article walks through who is authorized to perform and approve annual inspections, exactly what must appear in the maintenance record, what happens when an aircraft is found unairworthy, and how these records tie into the broader regulatory picture.
Who Is Authorized to Approve an Annual Inspection
Not every certificated mechanic can sign off an annual inspection. Under 14 CFR Part 43.7, the return-to-service approval after an annual inspection may only be made by a person holding an Airframe and Powerplant (A&P) certificate with an Inspection Authorization (IA). An IA is an additional authorization issued by the FAA under 14 CFR Part 65, Subpart E, and is granted only to mechanics who already hold a full A&P and meet experience, recency, and facilities requirements. A mechanic holding only an A&P — without the IA — may assist in performing the inspection but cannot approve the aircraft for return to service upon completion.
Additionally, certain certificate holders are authorized to conduct and approve annual-type inspections under their own approved inspection programs — for example, air carriers operating under 14 CFR Part 121 or Part 135 with approved continuous airworthiness maintenance programs (CAMPs). Certificated repair stations operating under 14 CFR Part 145 may also be authorized, depending on their ratings. For most general aviation aircraft, however, the IA-holding mechanic is the key figure.
What the Regulation Requires in the Maintenance Record
The content of a proper maintenance record entry is spelled out in 14 CFR 43.11. This regulation applies to inspections required under Part 91 and Part 43, including annual inspections. The person approving or disapproving an aircraft for return to service after an inspection must make an entry in the aircraft's maintenance record containing each of the following elements:
- Type of inspection performed. The record must specifically identify the inspection — for example, "Annual Inspection" — so there is no ambiguity about the scope of the work.
- Date of the inspection. The exact calendar date the inspection was completed (or the date the disapproval is recorded) must be entered.
- Aircraft total time in service. This is expressed in total airframe hours accumulated since the aircraft was new. Accurate recording of this figure is critical because it anchors the inspection in the aircraft's life-cycle history.
- Certification statement. For an approval for return to service, the inspector must state that the aircraft has been inspected in accordance with the applicable inspection, and that the aircraft was determined to be in airworthy condition. 14 CFR 43.11(a)(1) specifies the required elements of this certification statement; a commonly used phrasing that satisfies this requirement is: "I certify that this aircraft has been inspected in accordance with an annual inspection and was determined to be in airworthy condition."
- Signature, certificate number, and certificate type. The entry must be signed by the IA (or other authorized person), and must include their certificate number and the type of certificate — typically "A&P with IA" — so the identity and authority of the approving person are unambiguous.
The Airmen Certification Standards and the FAA's Aviation Maintenance Technician Handbook — General (FAA-H-8083-30) reinforce that incomplete entries are a common source of regulatory violations and can expose mechanics to certificate action. Every element listed above is legally required — omitting even one item, such as forgetting the certificate number, renders the entry non-compliant.
Disapproval for Return to Service
An annual inspection does not always end in approval. When the IA determines that the aircraft has defects that render it unairworthy, the aircraft cannot be approved for return to service. Under 14 CFR 43.11(b), the inspector must still make a maintenance record entry, but in this case the entry must:
- Describe the scope and nature of the inspection.
- List the defects or unairworthy conditions found.
- Include a statement that the aircraft was inspected in accordance with an annual inspection and a list of discrepancies and unairworthy items dated and signed by the inspector.
- Carry the inspector's signature, certificate number, and certificate type.
Critically, the inspector must also provide the aircraft owner or operator with a signed and dated list of the discrepancies. This list serves as official notice that the aircraft is unairworthy and details what must be corrected before a return-to-service approval can be granted. The owner is legally prohibited from operating the aircraft in this condition unless conducting a ferry flight under a Special Flight Permit issued in accordance with 14 CFR 21.197.
A common misconception is that an IA can simply refuse to complete the paperwork if an aircraft is unairworthy. The regulation is clear: even a disapproval requires a formal written entry and a discrepancy list. Failure to provide these is itself a regulatory violation.
Where the Entry Is Made
Aircraft maintenance records may take several forms. For general aviation piston aircraft, the traditional format is separate airframe and engine logbooks, sometimes supplemented by a propeller logbook. The annual inspection entry goes into the airframe logbook (and engine/propeller records if those components were inspected as part of the annual). Some modern operators use computerized maintenance tracking systems, and these are acceptable provided the entries include all required information and are retrievable for FAA inspection.
Under 14 CFR 91.417, the owner or operator of an aircraft is responsible for maintaining the maintenance records and must keep records of inspections, including annual inspections, until the work is repeated or superseded by equivalent subsequent work, or for at least one year, whichever occurs first. Records showing the current status of airworthiness directives and life-limited parts must be retained as long as the aircraft is operated.
The Twelve-Calendar-Month Rule
The annual inspection interval is defined in 14 CFR 91.409(a): no person may operate an aircraft (unless it is operating under an approved inspection program) unless within the preceding twelve calendar months the aircraft has had an annual inspection and been approved for return to service. "Calendar month" means the entire calendar month — so if an aircraft's annual was signed off on March 15 of one year, the inspection remains valid through the last day of March the following year, regardless of when in March it was completed. This is a frequently tested nuance.
Key Numbers and Rules
- 14 CFR 43.11 — Specifies the required content of maintenance record entries for inspections.
- 14 CFR 43.7 — Identifies who may approve an aircraft for return to service; annual sign-off requires an IA.
- 14 CFR 91.409(a) — Establishes the twelve-calendar-month annual inspection requirement.
- 14 CFR 91.417 — Owner/operator responsibility for maintaining and retaining aircraft records; at least one year for general maintenance records.
- Six required elements in an approval entry: type of inspection, date, total time in service, airworthy certification statement, signature, certificate number and type.
- Disapproval still requires a formal entry AND a written discrepancy list given to the owner.
- Only an A&P with an IA may approve a general aviation aircraft for return to service after an annual inspection (absent other approved programs).
Common Test Traps
- Confusing who can perform vs. who can approve. A plain A&P can assist in doing the inspection work, but only an IA can sign the aircraft off for return to service. Test questions often mix these roles — read carefully.
- Forgetting the disapproval entry. Many students assume that if an aircraft fails an annual, no logbook entry is needed until it is fixed. Wrong — a disapproval entry and a written discrepancy list are legally required immediately.
- Misreading the twelve-calendar-month rule. The expiration is the last day of the twelfth calendar month after the month of sign-off — not twelve months to the day. An annual signed on January 3 is valid through January 31 of the following year.
- Omitting the certificate number. The inspector's signature alone is insufficient. The entry must include the certificate number and certificate type or it is non-compliant with 43.11.
- Confusing total time with time since last inspection. The required entry is total time in service (total airframe hours), not merely the time accrued since the previous annual. Both figures are useful, but the regulation specifically requires total time.