Federal Aviation Administration December 17, 2012 – Federal Register Recent Federal Regulation Documents
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Airworthiness Directives; Embraer S.A. Airplanes
We propose to adopt a new airworthiness directive (AD) for certain Embraer S.A. Model ERJ 190 airplanes. This proposed AD was prompted by reports of cracks on the side stay of the main landing gear (MLG). This proposed AD would require repetitive measurements of the left-hand (LH) and right-hand (RH) MLG side stay support fitting to detect bushing migration, replacement of the bushing if necessary, and eventual replacement of the bushing; a detailed inspection for damage on the LH and RH MLG side stay support assembly, and related investigative and corrective actions if necessary. We are proposing this AD to prevent excessive bearing friction, which might compromise the MLG free fall extension, and cause fatigue cracking on the MLG side stay and on its support assembly, resulting in reduced structural integrity of the MLG.
Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes
We are adopting a new airworthiness directive (AD) for certain Gulfstream Aerospace Corporation Model GIV-X airplanes. This AD requires performing a modified system power-on self test (SPOST) of the flap/stabilizer electronic control unit (FSECU), and revising the airplane flight manual to incorporate these test procedures into the daily preflight check. This AD was prompted by reports indicating that the FSECU does not detect failures of the brake feature within the horizontal stabilizer electric motor unit (HSEMU), or failures of drive solenoids for hydraulic valves within the flap hydraulic control module (FHCM) during the SPOST. We are issuing this AD to detect and correct such failures, which could result in runaway horizontal stabilizer pitch trim system and consequent loss of pitch control.
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