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SESK: Stuff Everyone Should Know · sesk.info/comm-hundred-hour-grace

The 100-hour inspection limit may be exceeded by no more than how many hours while en route to the inspection?

10 hours, and the excess counts toward the next 100 hours.

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  1. 5 hours
  2. 25 hours
  3. 10 hours ✔

Why: Section 91.409(b) allows the limit to be exceeded by not more than 10 hours while flying to a place where the inspection can be done. The excess time is included when computing the next 100 hours.

Huh, didn't know that: The grace period applies only to getting to the inspection, not to continuing normal flights.

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References

Answer: 10 hours. Section 91.409(b) allows the limit to be exceeded by not more than 10 hours while flying to a place where the inspection can be done. The excess time is included when computing the next 100 hours.

  1. 14 CFR 91.409 Inspections (Cornell LII eCFR mirror) www.law.cornell.edu/cfr/text/14/91.409
    The 100-hour limitation may be exceeded by not more than 10 hours while en route
    Checked 2026-10-10.

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