Federal Aviation Administration December 1, 2022 – Federal Register Recent Federal Regulation Documents
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Reopening of Comment Period for Proposed Voluntary Agreement at Statue of Liberty National Monument and Governors Island National Monument
The FAA, in cooperation with the National Park Service (NPS), announces the reopening of the public comment period for an additional 30 days on the proposed voluntary agreement for Statue of Liberty National Monument and Governors Island National Monument. On October 21, 2022 the agencies announced a 30-day comment period ending November 21, 2022. Comments previously submitted need not be resubmitted.
Airworthiness Directives; CFM International, S.A. Turbofan Engines
The FAA proposes to supersede Airworthiness Directive (AD) 2021-10-09, which applies to all CFM International, S.A. (CFM) CFM56-5B and CFM56-7B model turbofan engines with a certain high-pressure turbine (HPT) inner stationary seal installed. AD 2021-10-09 requires removal, inspection, and replacement of the affected HPT inner stationary seal and, depending on the findings, replacement of the rotating air HPT front seal, HPT rotor blades, and No. 3 ball bearing. Since the FAA issued AD 2021-10-09, the manufacturer notified the FAA that the service information incorrectly lists the year of certain honeycomb repairs. Additionally, the manufacturer notified the FAA that affected HPT inner stationary seals could potentially be installed on CFM CFM56-5C model turbofan engines. This proposed AD would require removal, inspection, and replacement of the affected HPT inner stationary seal and, depending on the findings, replacement of the rotating air HPT front seal, HPT rotor blades, and No. 3 ball bearing. This proposed AD would also revise the applicability to add CFM CFM56- 5C model turbofan engines. The FAA is proposing this AD to address the unsafe condition on these products.
Airworthiness Directives; CFM International, S.A. Turbofan Engines
The FAA proposes to adopt a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) LEAP-1B turbofan engines. This proposed AD was prompted by a report of multiple aborted takeoffs and air turn-backs (ATBs) caused by high-pressure compressor (HPC) stall, which was induced by high levels of non-synchronous vibration (NSV). A subsequent investigation by the manufacturer revealed that wear on the No. 3 bearing spring finger housing can lead to high levels of NSV. This proposed AD would require repetitive calculations of the oil filter delta pressure (OFDP) data and, depending on the results of the calculation, replacement of the No. 3 bearing spring finger housing. This proposed AD would also prohibit installation of an engine with an affected No. 3 bearing spring finger housing onto an airplane that already has one engine with an affected No. 3 bearing spring finger housing installed. The FAA is proposing this AD to address the unsafe condition on these products.
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