Federal Aviation Administration March 28, 2019 – Federal Register Recent Federal Regulation Documents

We are superseding Airworthiness Directive (AD) 2016-22-05 for certain Pratt & Whitney Division (PW) PW4164, PW4164-1D, PW4168, PW4168-1D, PW4168A, PW4168A-1D, and PW4170 model turbofan engines. AD 2016-22-05 required initial and repetitive inspections of the affected fuel nozzles and their replacement with parts eligible for installation. This AD requires initial and repetitive inspections of the affected fuel nozzles and fuel nozzle supply manifold assemblies, replacement of the affected fuel nozzles with parts eligible for installation, and the installation of new brackets and clamps on the fuel nozzle supply manifold assemblies. This AD was prompted by several instances of fuel leaks on PW engines with the Talon IIB combustion chamber configuration installed. We are issuing this AD to address the unsafe condition on these products.

We are removing AD 2012-02-18, which applied to all Dassault Aviation Model MYSTERE-FALCON 50 airplanes. AD 2012-02-18 required revising the maintenance program to include revised airworthiness limitations. We issued AD 2012-02-18 to address cracking of the flap tracks, which could lead to flap asymmetry and loss of control of the airplane. Since we issued AD 2012-02-18, we have issued AD 2017-09-03 to address the unsafe condition. Accordingly, AD 2012-02-18 is removed.