Airworthiness Directive · Amendment 39-19359 · Flight controls
Airbus SAS Airplanes
Superseded. A later AD replaced this one: AD 2020-20-16. Comply with the one in force.
This AD applies to Airbus SAS Model A350-941 and -1041 airplanes, certificated in any category, all manufacturer serial numbers.
We are adopting a new airworthiness directive (AD) for all Airbus SAS Model A350-941 and -1041 airplanes. 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. This AD requires a check of the insulation resistance of the DDSOV of each affected EHA and applicable corrective actions. We are issuing this AD to address the unsafe condition on these products.
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.
(1) For Group 1 airplanes, which have not been inspected in accordance with the instructions of Airbus Alert Operators Transmission (AOT) A27P009-16: Within 3 months after the airplane has reached 700 flight hours since airplane first flight, or within 30 days after the effective date of this AD, whichever occurs later, accomplish an insulation resistance check (detailed inspection) of the DDSOV of each affected EHA, in accordance with the Accomplishment Instructions of Airbus Service Bulletin A350-27-P020, dated February 22, 2018.
(2) For Group 1 airplanes, which have been inspected in accordance with the instructions of Airbus AOT A27P009-16: Within 3 months after the airplane has reached 36 months since airplane first flight, or within 3 months after the effective date of this AD, whichever occurs later, accomplish an insulation resistance check of the DDSOV of each affected EHA, in accordance with the Accomplishment Instructions of Airbus Service Bulletin A350-27-P020, dated February 22, 2018.
(1) If during the check required by paragraph (h)(1) of this AD, the measured insulation resistance is 15 Megohms (MOhms) or less, before next flight, replace the affected EHA with a serviceable EHA, in accordance with the Accomplishment Instructions of Airbus Service Bulletin A350-27-P020, dated February 22, 2018.
(2) If during the check required by paragraph (h)(1) of this AD, the measured insulation resistance is more than 15 MOhms, within 3 months after the airplane has reached 36 months since airplane first flight, or within 3 months after the effective date of this AD, whichever occurs later, accomplish an insulation resistance check of the DDSOV of each affected EHA, in accordance with the Accomplishment Instructions of Airbus Service Bulletin A350-27-P020, dated February 22, 2018.
(3) Depending on measured resistance result of the check required by paragraph (h)(2) or (i)(2) of this AD, within the applicable compliance time defined in figure 1 to paragraph (i)(3) of this AD, accomplish the applicable corrective action(s) defined in figure 1 to paragraph (i)(3) of this AD, in accordance with the Accomplishment Instructions of Airbus Service Bulletin A350-27-P020, dated February 22, 2018; or the applicable service information specified in paragraphs (g)(1)(i), (g)(1)(ii), and (g)(1)(iii) of this AD.
For each check required by paragraph (h)(2) or (i)(2) of this AD: Within 30 days after each check required by paragraph (h)(2) or (i)(2) of this AD or within 30 days after the effective date of this AD, whichever occurs later, report the results, including no findings, using the online reporting application in AirbusWorld, as specified in Appendix A. “Inspection Report” of Airbus Service Bulletin A350-27-P020, dated February 22, 2018.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
