Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170 and ERJ 190 Airplanes

요약

We propose to adopt a new airworthiness directive (AD) for the products listed above that would supersede an existing AD. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI for EMBRAER Model ERJ 170 describes the unsafe condition as: It has been found the occurrence of an engine in-flight shutdown caused by the LPCV [low pressure check valves] failing to close due to excessive wear, which leads to the concern that such fault may be present in both engines of a given aircraft. The MCAI for EMBRAER Model ERJ 190 describes the unsafe condition as: An occurrence of an uncommanded engine in-flight shutdown (IFSD) was reported, which was caused by an ERJ 170 defective LPCV. The valve failed to close due to excessive wear. Despite there were no IFSD related to LPCV failure, some ERJ 190 valves were inspected and presented cracks due to low cycle fatigue. Since this failure mode also might lead to an engine in-flight shutdown and since both engines of the airplane have the same valves, there is a possibility of an occurrence of