AD 2025-03395
Published 2025-03-04 · 2 models · 2 US-registered tails affected · Federal Register
Airworthiness Directives; The Boeing Company Airplanes Federal Register ↗
Abstract
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD was prompted by two engine fan blade-out (FBO) events that resulted in the separation of engine inlet cowl and fan cowl parts from the airplane. In one event, fan cowl parts damaged the fuselage, which caused loss of pressurization and subsequent emergency descent. This AD requires replacing the fasteners on the fan cowl support beam hinge fittings for certain airplanes and, for all airplanes, requires modifying the radial restraint assembly and installing an external doubler at the starter vent, or as an option, installing a serviceable fan cowl. This AD also requires revising the existing maintenance or inspection program, as applicable, to incorporate new airworthiness limitations. The FAA is issuing this AD to address the unsafe condition on these products.
Applicability · by US fleet size
Federal Register text
Verbatim; the Federal Register publication is the legally binding document. Cite: 90 FR 11109. View on Federal Register ↗
[Federal Register Volume 90, Number 41 (Tuesday, March 4, 2025)] [Rules and Regulations] [Pages 11109-11116] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 2025-03395]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2023-2234; Project Identifier AD-2023-00963-T; Amendment 39-22960; AD 2025-04-02] RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD was prompted by two engine fan blade-out (FBO) events that resulted in the separation of engine inlet cowl and fan cowl parts from the airplane. In one event, fan cowl parts damaged the fuselage, which caused loss of pressurization and subsequent emergency descent. This AD requires replacing the fasteners on the fan cowl support beam hinge fittings for certain airplanes and, for all airplanes, requires modifying the radial restraint assembly and installing an external doubler at the starter vent, or as an option, installing a serviceable fan cowl. This AD also requires revising the existing maintenance or inspection program, as applicable, to incorporate new airworthiness limitations. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective April 8, 2025. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of April 8, 2025.