August 21, 2017 – Federal Register Recent Federal Regulation Documents

We are superseding Airworthiness Directive (AD) 2014-16-01 for MD Helicopters, Inc. (MDHI), Model MD900 helicopters. AD 2014-16-01 required an eddy current inspection of the main rotor upper hub assembly (upper hub) for a crack. This AD requires additional inspections and replacing the fillet seal. This AD was prompted by three additional reports of upper hub cracks. The actions of this AD are intended to prevent an unsafe condition on these products.

We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 777 airplanes. This AD was prompted by reports of cracks on the underwing longerons. This AD requires repetitive inspections of the left and right side underwing longerons for any crack, and related investigative and corrective actions if necessary. We are issuing this AD to address the unsafe condition on these products.

We are revising an earlier proposal for certain The Boeing Company Model 777 airplanes. This action revises the notice of proposed rulemaking (NPRM) by adding an inspection to determine a part number and to incorporate an airworthiness limitation (AWL) into the maintenance or inspection program. This action also revises the NPRM by specifying a new version of the airline information management system (AIMS) software for airplanes equipped with AIMS-2 software. We are proposing this Airworthiness Directive (AD) to address the unsafe condition on these products. Since these actions impose an additional burden over that proposed in the NPRM, we are reopening the comment period to allow the public the chance to comment on these proposed changes.