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SESK: Stuff Everyone Should Know · sesk.info/comm-annual-12

An annual inspection must have been completed within the preceding how many calendar months?

12 calendar months.

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  1. 12 calendar months ✔
  2. 6 calendar months
  3. 24 calendar months

Why: Section 91.409(a) says no person may operate an aircraft unless it has had an annual inspection within the preceding 12 calendar months, approved for return to service by an authorized person. It is due by the end of that month.

Huh, didn't know that: An inspection done to issue an airworthiness certificate also satisfies the 12-month requirement.

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What do you call it when you're sick of being in the airport? Terminal illness.
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References

Answer: 12 calendar months. Section 91.409(a) says no person may operate an aircraft unless it has had an annual inspection within the preceding 12 calendar months, approved for return to service by an authorized person. It is due by the end of that month.

  1. 14 CFR 91.409 Inspections (Cornell LII eCFR mirror) www.law.cornell.edu/cfr/text/14/91.409
    within the preceding 12 calendar months
    Checked 2026-10-10.

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