Boeing 737 Rule Gets Date and Reference Fixes from FAA
Published Date: 3/21/2025
Rule
Summary
The FAA fixed some mistakes in a safety rule for Boeing 737 airplanes, like wrong dates and references. This update affects all 737-600 to 737-900ER models and keeps the original safety checks but with the right info. The correction kicks in on April 8, 2025, so airlines can keep flying safely without extra costs or delays.
Analyzed Economic Effects
4 provisions identified: 2 benefits, 2 costs, 0 mixed.
Deadline to operate without upgrades — 2028 and 2029
All affected 737 airplanes that have not incorporated the specified fan-blade-out and nacelle maintenance error modifications cannot operate past July 31, 2028 for the fan-blade-out related limitations, and cannot be operated past December 31, 2029 for the engine nacelle maintenance-error limitations, unless upgraded to hardware fully compliant with the referenced airworthiness standards.
737 operators must perform specified retrofits
If you operate Boeing Model 737-600, -700, -700C, -800, -900, or -900ER airplanes, you must, at the times specified in Boeing Special Attention Requirements Bulletin 737-71-1937 RB, Revision 1, dated June 27, 2024, do the listed actions: replace fasteners on the fan cowl support beam hinge fittings for certain airplanes, modify the radial restraint assembly and install an external doubler at the starter vent for engines, or optionally install a serviceable fan cowl, and revise your maintenance or inspection program to incorporate the new airworthiness limitations. These compliance requirements are effective April 8, 2025.
Credit if you already did the work before April 8, 2025
If you performed the actions required by paragraph (g) before the effective date using Boeing Special Attention Requirements Bulletin 737-71-1937 RB dated July 27, 2023, you receive credit for those actions under this AD.
Correction fixes wrong references and adds no new costs
This Federal Register correction fixes incorrect service-document references and two wrong dates in the previously published AD and is effective April 8, 2025. The FAA states that because this action only corrects those references and specifies later dates for airworthiness limitations, it "has no adverse economic impact and imposes no additional burden on any person."
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