Special Conditions: Dassault Falcon Model 900 and 900EX Airplanes; Interaction of Systems and Structures
These special conditions are issued for the Dassault Falcon Model 900 and 900EX airplanes. These airplanes, as modified by Aviation Partners Incorporated (API), will have a novel or unusual design feature associated with the interaction of systems and structures regarding installation of an automated wing-load-alleviation system. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. For the Dassault 900 and 900EX models with winglets, failure of the wing-load- alleviation system can result in a factor of safety (FS) below 1.5 as required. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.
Approval of Noise Compatibility Program for Lambert-St. Louis International Airport, St. Louis, MO
The Federal Aviation Administration (FAA) announces its findings on the noise compatibility program submitted by the St. Louis Airport Authority under the provisions of 49 U.S.C. 47501 et seq. (formerly the Aviation Safety and Noise Abatement Act, hereinafter referred to as ``the Act'') and 14 Code of Federal Regulations (CFR) part 150 (hereinafter referred to as ``Part 150''). On April 5, 2011, the FAA determined that the noise exposure maps submitted by the St. Louis Airport Authority under Part 150 were in compliance with applicable requirements. On August 26, 2011, the FAA approved the Lambert-St. Louis International Airport noise compatibility program. All of the recommendations of the program were approved. No program elements relating to new or revised flight procedures for noise abatement were proposed by the airport operator.
Airworthiness Directives; Dowty Propellers Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, and R334/4-82-F/13 Propeller Assemblies
We are revising an existing airworthiness directive (AD) for the products listed above. That AD currently requires initial and repetitive ultrasonic inspections of propeller hubs, part number (P/N) 660709201. This new AD requires introducing a new hub assembly P/N as an optional terminating action to the repetitive hub inspections. This AD was prompted by the need to introduce an optional terminating action for the repetitive inspections. We are issuing this AD to prevent propeller hub failure due to cracks in the hub, which could result in loss of control of the airplane.