EASA AD US-2021-10-07
Time Limits / Maintenance Checks — Airworthiness Limitations Section Certification Maintenance Requirement — Amendment
Summary
The Time Limits / Maintenance Checks — Airworthiness Limitations Section Certification Maintenance Requirement — Amendment is a final rule airworthiness directive issued by the FAA affecting certain Boeing 737-8 and 737-9 (737 MAX) airplanes. It mandates the incorporation of three additional Certification Maintenance Requirements (CMRs) into the existing maintenance or inspection programs to address potential latent failures in the flight control system. This directive aims to ensure continued airworthiness and safety of the affected aircraft.
What Changed
This airworthiness directive introduces a requirement to revise maintenance or inspection programs to include three new CMRs identified as 22-CMR-01, 22-CMR-02, and 27-CMR-09. These CMRs were developed following a review of the 737 MAX flight control system and are intended to prevent reduced controllability caused by latent failures. The directive applies only to airplanes with original airworthiness certificates issued before November 20, 2020.
Why It Matters
For aviation professionals, this directive is critical because it addresses an unsafe condition that could compromise flight control system functionality under certain failure scenarios. Operators and maintenance organizations must update their programs to include these new CMRs to maintain regulatory compliance and ensure the long-term safety and reliability of the 737 MAX fleet. Failure to comply could result in unsafe flight conditions and regulatory penalties.
What To Do
Affected operators must revise their maintenance or inspection programs to incorporate the three additional CMRs as specified in the directive. This revision must be completed by the effective date of July 8, 2021. Operators should also review Boeing's Multi-Operator Message MOM-MOM-20-0891-01B for guidance and ensure ongoing compliance with these maintenance requirements.
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