Flight Standards Service

Draft Advisory Circulars (ACs) Open for Comment

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Latest entries are at the bottom of this list of Document Titles.

Document Title: AC 121-22D, Maintenance Review Boards, Maintenance Type Boards, and Original Equipment Manufacturer/Type Certificate Holder Recommended Maintenance Procedures
Summary: This AC provides information that industry may use to develop and revise the minimum scheduled maintenance tasking/interval requirements for derivative or newly type-certificated aircraft and powerplants for Federal Aviation Administration (FAA) approval.

Title 14 of the Code of Federal Regulations (14 CFR)

  • Part 1, Definitions and Abbreviations.
  • Part 21, Certification Procedures for Products and Articles.
  • Part 23, Airworthiness Standards: Normal Category Airplanes.
  • Part 25, Airworthiness Standards: Transport Category Airplanes.
  • Part 26, Continued Airworthiness and Safety Improvements for Transport Category Airplanes.
  • Part 27, Airworthiness Standards: Normal Category Rotorcraft.
  • Part 29, Airworthiness Standards: Transport Category Rotorcraft.
  • Part 33, Airworthiness Standards: Aircraft Engines.
  • Part 35, Airworthiness Standards: Propellers.
  • Part 43, Maintenance, Preventive Maintenance, Rebuilding, and Alteration.
Documents for Download: Draft Document (PDF)
Draft Document Comment Grid (MS Word)
Comments Due: December 29, 2023
How to Comment: Email comments

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Last updated: Wednesday, November 29, 2023