Federal Aviation Administration December 24, 2015 – Federal Register Recent Federal Regulation Documents

This action proposes to establish Class E airspace at Danville, AR. Controlled airspace is necessary to accommodate new Standard Instrument Approach Procedures developed at Danville Municipal Airport, for the safety and management of Instrument Flight Rules (IFR) operations at the airport.

We propose to supersede Airworthiness Directive (AD) 2014-16- 02, for certain Bombardier, Inc. Model CL-600-1A11 (CL-600) airplanes. AD 2014-16-02 currently requires revising the airplane flight manual to prohibit thrust reverser operation, doing repetitive detailed inspections of both engine thrust reversers for cracks, and modifying the thrust reversers if necessary. The modification of the thrust reversers is also an optional terminating action for the repetitive inspections. Since we issued AD 2014-16-02, we have determined that it is necessary to add a requirement to repair or modify the thrust reversers, which would terminate the requirements of AD 2014-16-02. We are proposing this AD to detect and correct cracks of the translating sleeve at the thrust reverser actuator attachment points, which could result in deployment or dislodgement of an engine thrust reverser in flight and subsequent reduced control of the airplane.

We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 777 airplanes. This AD was prompted by an evaluation by the design approval holder (DAH) indicating that the lap splices of the aft pressure bulkhead webs are subject to widespread fatigue damage (WFD) on aging Model 777 airplanes that have accumulated at least 38,000 total flight cycles. This AD requires repetitive inspections for any crack in the aft webs of the radial lap splices of the aft pressure bulkhead, and, if necessary, corrective actions. We are issuing this AD to detect and correct fatigue cracking in the aft webs of the radial lap splices of the aft pressure bulkhead; such cracking could result in reduced structural integrity of the airplane, decompression of the cabin, and collapse of the floor structure.

We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model CL-600-2A12 (CL-601) and CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604 Variants) airplanes. This AD was prompted by a report of an aft equipment bay fire due to chafing and subsequent arcing of the integrated drive generator (IDG) power cables. Additionally, we have received several reports of broken support brackets of the hydraulic line. This AD requires a one-time inspection of the IDG power cables for chafing, and for any cracked or broken support bracket of the hydraulic line; and corrective actions if necessary. We are issuing this AD to detect and correct broken support brackets of the hydraulic lines, which could result in inadequate clearance between the IDG power cables and hydraulic lines and chafing of the IDG power cables, and consequent high energy arcing and an uncontrolled fire in the aft equipment bay.

We are revising an earlier proposed airworthiness directive (AD) for all Gulfstream Aerospace Corporation Model GV and GV-SP airplanes. The NPRM proposed to supersede Airworthiness Directive (AD) 2013-22-19, which requires inspecting to determine if fuel boost pumps having a certain part number are installed, replacing the fuel boost pumps having a certain part number, and revising the airplane maintenance or inspection program to include revised instructions for continued airworthiness. The NPRM also proposed to require revising the airplane maintenance program to include a fuel leak check of the fuel boost pumps, using new service information. The NPRM was prompted by reports of two independent types of failure of the fuel boost pump: overheat damage on the internal components and external housing, and fuel leakage. This action revises the NPRM by reducing the compliance time for revising the airplane maintenance program. We are proposing this supplemental NPRM (SNPRM) to prevent fuel leakage in combination with a capacitor clearance issue, which could result in an uncontrolled fire in the wheel well. 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.