2021-16174

Document Headings Document headings vary by document type but may contain the following: • the agency or agencies that issued and signed a document • the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to • the agency docket number / agency internal file number • the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Department of Transportation Federal Aviation Administration • 14 CFR Part 39 • [Docket No. FAA-2020-0333; Product Identifier 2020-NM-015-AD; Amendment 39-21623; AD 2021-13-18] • RIN 2120-AA64 AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737 airplanes powered by LEAP-1B engines. This AD was prompted by reports of inadvertent release of the spring energy of the spring door opening system (SDOS) actuator with a certain part number, causing injury and the potential for injury to maintenance personnel. This AD requires replacing each affected SDOS actuator with a new SDOS actuator, and verifying that new safety markers are installed in the proper locations. The FAA is issuing this AD to address the unsafe condition on these products. DATES: This AD is effective September 3, 2021. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of September 3, 2021. ADDRESSES: For service information identified in this final rule, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-5600; telephone 562-797-1717; internet https://www.myboeingfleet.com. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 206-231-3195. It is also available on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2020-0333. Examining the AD Docket You may examine the AD docket on the internet at https://www.regulations.gov by searching for and locating Docket No. FAA-2020-0333; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this final rule, any comments received, and other ( printed page 40928) information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590. FOR FURTHER INFORMATION CONTACT: Rose Len, Aerospace Engineer, Propulsion Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206-231-3604; email: rose.len@faa.gov. SUPPLEMENTARY INFORMATION: Background The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to all The Boeing Company Model 737-8 and 737-9 airplanes. The NPRM published in the Federal Register on April 20, 2020 (85 FR 21791). The NPRM was prompted by a report of an incident involving an SDOS actuator. The SDOS actuator is a telescopic, spring-loaded actuator that assists the mechanic in raising the engine fan cowl. Even when the actuator is extended (uncompressed), it retains energy in the spring (preloaded). In the incident, after an SDOS actuator with part number BOE-2001-901F was removed, a part separation occurred at the joint between the actuator's inner tube and its related “back end” bracket. The actuator came apart with spring-propelled force, injuring one of the maintenance personnel. This SDOS actuator used two roll pins and epoxy at this joint. The FAA has determined that this design, together with spring preload, caused these parts to break. The FAA received a second report of a hazardous sudden extension of this actuator when, during improper removal of the SDOS actuator from the engine fan cowl while it was retracted, the SDOS actuator rapidly extended, with the potential to cause injury. This was possible b…

Fonte: Federal Register (federalregister.gov). Texto original em inglês. Conteúdo sanitizado por segurança.