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CFR
Part 21
§ 21.91

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14 CFR · Part 21

14 CFR § 21.91

Applicability.

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Read in Subpart D

Part 21 Contents

Special Federal Aviation Regulation No. 88: Fuel Tank System Fault Tolerance Evaluation Requirements
Subpart A: General
Subpart B: Type Certificates
Subpart C: Provisional Type Certificates
Subpart D: Changes to Type Certificates
Subpart E: Supplemental Type Certificates
Subpart F: Production Under Type Certificate
Subpart G: Production Certificates
Subpart H: Airworthiness Certificates
Subpart I: Provisional Airworthiness Certificates
Subpart K: Parts Manufacturer Approvals
Subpart L: Export Airworthiness Approvals
Subpart N: Acceptance of Aircraft Engines, Propellers, and Articles for Import
Subpart O: Technical Standard Order Approvals
Subpart P: Special Federal Aviation Regulations

This subpart prescribes procedural requirements for the approval of changes to type certificates.

Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.

Primary Source

Official Source (14 CFR · Part 21)