Airworthiness directives › 2018-17-05
AD 2018-17-05 Airworthiness Directives; Airbus SAS Airplanes
Models named: A350-941, -1041. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Airbus SAS Model A350-941 and -1041 airplanes, certificated in any category, all manufacturer serial numbers.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For the purposes of this AD, the definitions specified in paragraphs (g)(1), (g)(2), and (g)(3) of this AD apply. (1) An affected EHA is an EHA installed on inboard ailerons, elevators, and rudder, as listed by part number and serial number in the applicable service information specified in paragraphs (g)(1)(i), (g)(1)(ii), and (g)(1)(iii) of this AD, except those that are paint marked, as specified in the applicable service information specified in paragraphs (g)(1)(i), (g)(1)(ii), and (g)(1)(iii) of this AD. (i) Moog Aircraft Group Service Bulletin CA67001-27-05, dated February 21, 2018 (aileron). (ii) Moog Aircraft Group Service Bulletin CA67006-27-04, dated February 21, 2018 (elevator). (iii) Moog Aircraft Group Service Bulletin CA67008-27-04, dated February 21, 2018 (rudder). (2) A serviceable EHA is an EHA having a part number and serial number not listed in the applicable service information specified in paragraphs (g)(1)(i), (g)(1)(ii), and (g)(1)(iii) of this AD; or an affected EHA having a paint mark as specified in the applicable service information specified in paragraphs (g)(1)(i), (g)(1)(ii), and (g)(1)(iii) of this AD. (3) Group 1 airplanes are those that have an affected EHA installed. Group 2 airplanes are those that do not have an affected EHA installed.
Unsafe condition
This AD was prompted by reports that electro-hydrostatic actuators (EHAs), installed on the inboard ailerons, elevators, and rudder, had degraded insulation resistance in the direct drive solenoid valve (DDSOV), due to incorrect sealing application. We are issuing this AD to address this condition, which could lead to the DDSOV being unable to command or maintain the EHA in active mode, possibly resulting in reduced control of the airplane.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1