14 CFR · Part 39
14 CFR § 39.21
Where can I get information about FAA-approved alternative methods of compliance?
Each airworthiness directive identifies the office responsible for approving alternative methods of compliance. That office can provide information about alternatives it has already approved.
Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.
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