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SESK: Stuff Everyone Should Know · sesk.info/sport-mosaic-lsa-date

When did MOSAIC's light-sport aircraft certification rules take effect?

July 24, 2026.

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  1. July 24, 2026 ✔
  2. October 22, 2025
  3. July 24, 2027

Why: The FAA phased in MOSAIC. Sport pilot and repairman changes started 90 days after publication. Light-sport aircraft certification changes took effect 365 days after publication, on July 24, 2026.

Huh, didn't know that: As of October 2026, both phases of the rule are already in effect.

The dad joke
Why did the aircraft rules take a year? They wanted to be fully ready for takeoff.
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References

Answer: July 24, 2026. The FAA phased in MOSAIC. Sport pilot and repairman changes started 90 days after publication. Light-sport aircraft certification changes took effect 365 days after publication, on July 24, 2026.

  1. FAA announcement, July 2025 www.faa.gov/newsroom/us-transportation-secretary-sean-p-duffy-announces-improvements-recreational-aviation
    Changes for LSA certification take effect 365 days after the final rule publishes.
    Checked 2026-10-10.
  2. FAA MOSAIC Final Rule Fact Sheet www.faa.gov/newsroom/fact_sheets/MOSAIC_Fact_Sheet.pdf
    July 24, 2026 (365 days after publication)
    Checked 2026-10-10.

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