Airworthiness Directives; Bombardier, Inc. Airplanes
We propose to adopt a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-400 airplanes. This proposed AD was prompted by one in-service report of a cracked and corroded barrel nut found at the mid-spar location of the horizontal stabilizer to vertical stabilizer attachment joint. There have also been two other reports of corroded barrel nuts found at mid-spar locations. This proposed AD would require repetitive detailed inspections of each barrel nut and cradle, a check of the bolt torque of any preload indicating washer (PLI), and corrective action if necessary. We are proposing this AD to detect and correct cracked and corroded barrel nuts. This condition could compromise the structural integrity of the vertical stabilizer attachment joints, which could lead to loss of control of the airplane.
Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes
We propose to adopt a new airworthiness directive (AD) for certain Gulfstream Aerospace Corporation Model GV and GV-SP airplanes. This proposed AD was prompted by a new revision to the airworthiness limitations of the maintenance planning document based on fatigue and damage tolerance testing, and updated analysis. This proposed AD would require revising the maintenance or inspection program to update inspection requirements and life limits that address fatigue cracking of principal structural elements (PSEs). We are proposing this AD to ensure fatigue cracking of PSEs is detected and corrected; such fatigue cracking could result in reduced structural integrity of the PSEs and critical components.
Improving Flightcrew Awareness During Autopilot Operation
The Federal Aviation Administration (FAA) announces the cancellation of Policy Statement Number PS-ANM111-2001-99-01 (ANM-99- 01). The policy statement is cancelled because it was superseded by an advisory circular (AC) and is no longer necessary.
Airworthiness Directives; Sikorsky Aircraft Corporation (Sikorsky) Helicopters
The FAA is withdrawing a notice of proposed rulemaking (NPRM). The NPRM proposed a new airworthiness directive (AD) for Sikorsky Model S-92A helicopters. The proposed action would have required revising the Limitations section of the Rotorcraft Flight Manual (RFM) to clarify that the Model S-92A helicopter was certificated as a transport category rotorcraft in both Categories A and B with different operating limitations for each category and must be operated accordingly. Since we issued the NPRM, we have determined that operating the helicopter in Category B with 10 or more passenger seats is not an unsafe condition but an inconsistency with 14 CFR 29.1(c). Accordingly, we withdraw the proposed rule.
Airworthiness Directives; The Boeing Company Airplanes
We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-300, -400, and -500 series airplanes. This AD requires repetitive inspections for cracking in the horizontal and vertical flanges of the rear spar upper chord of the horizontal stabilizer, and related investigative and corrective actions if necessary. This AD was prompted by a report of cracking in the center section of the horizontal stabilizer. We are issuing this AD to detect and correct cracking of the rear spar center section of the horizontal stabilizer that could lead to departure of the horizontal stabilizer from the airplane.
Revision of Airworthiness Standards for Normal, Utility, Acrobatic, and Commuter Category Airplanes
The FAA proposes to amend its airworthiness standards for normal, utility, acrobatic, and commuter category airplanes by removing current prescriptive design requirements and replacing them with performance-based airworthiness standards. The proposed standards would also replace the current weight and propulsion divisions in small airplane regulations with performance- and risk-based divisions for airplanes with a maximum seating capacity of 19 passengers or less and a maximum takeoff weight of 19,000 pounds or less. The proposed airworthiness standards are based on, and would maintain, the level of safety of the current small airplane regulations. Finally, the FAA proposes to adopt additional airworthiness standards to address certification for flight in icing conditions, enhanced stall characteristics, and minimum control speed to prevent departure from controlled flight for multiengine airplanes. This notice of proposed rulemaking addresses the Congressional mandate set forth in the Small Airplane Revitalization Act of 2013.