Federal Aviation Administration April 6, 2021 – Federal Register Recent Federal Regulation Documents

The FAA is superseding Airworthiness Directive (AD) 2020-01- 10, which applied to certain Airbus SAS Model A350-941 airplanes. AD 2020-01-10 required installing flight control and guidance system (FCGS) software (SW) X11 Standard (STD). This AD retains the requirements of AD 2020-01-10, requires modifying the electrical power supply of the air generation system (AGS) ram air outlet door actuators, and expands the applicability by adding airplanes, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. This AD was prompted by the development of a modification that forces the AGS ram air outlet doors to be flush in cases of total engine flameout or loss of the main electrical supply. Because of this additional modification, certain airplanes that were excluded from the applicability of AD 2020-01-10 are included in the applicability of this AD. The FAA is issuing this AD to address the unsafe condition on these products.

The FAA is adopting a new airworthiness directive (AD) for certain Pacific Scientific Company rotary buckle assemblies (buckles). This AD requires inspecting each buckle including its buckle handle vane, and depending on the results, removing the buckle from service and installing an airworthy buckle. This AD also prohibits installing the affected buckles. This AD was prompted by several reports of cracked buckle handles. The actions of this AD are intended to address an unsafe condition on these products.

The FAA is adopting a new airworthiness directive (AD) for certain Rolls-Royce Deutschland Ltd & Co KG (RRD) Trent 1000-A2, 1000- AE2, 1000-C2, 1000-CE2, 1000-D2, 1000-E2, 1000-G2, 1000-H2, 1000-J2, 1000-K2, and 1000-L2 model turbofan engines. This AD was prompted by the manufacturer's analysis which determined that cracks may initiate in the front seal fins and cause cracks in the low-pressure turbine (LPT) disk. This AD requires repetitive inspection of the seal fins and, depending on the results of the inspection, replacement of the LPT disk before further flight. The FAA is issuing this AD to address the unsafe condition on these products.