Airworthiness Directive · Amendment 39-19379 · Flight controls
Airbus SAS Airplanes
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 of uncommanded motion of the flight control actuator. This AD requires replacing certain rudder and elevator servocontrols with serviceable servocontrols. We are issuing this AD to address the unsafe condition on these products.
For the purposes of this AD the following definitions apply:
(1) Affected part: A servocontrol having a part number and serial number specified in Appendix 2 of Airbus Alert Operators Transmission (AOT) A27P012-18, Rev 01, dated May 2018.
(2) Serviceable part: A servocontrol having a part number and serial number not specified in Appendix 2 of Airbus Alert Operators Transmission (AOT) A27P012-18, Rev 01, dated May 2018; or an affected part that was reworked or modified in-shop and identified by “27-06” (rudder servocontrol) or “27-04” (elevator servocontrol) marked after the serial number of the servocontrol; or an affected part that has been modified on the airplane by replacing the servo module in accordance with the instructions of Airbus Alert Operators Transmission (AOT) A27P012-18, Rev 01, dated May 2018, including Appendixes 2 through 6.
(3) Groups: Group 1 airplanes have any affected part installed. Group 2 airplanes do not have any affected part installed.
(4) Flight hours: The flight hours indicated in table 1 to paragraphs (g)(4) and (h) of this AD are those accumulated by an affected part since its first installation on an airplane. In case these flight hours are unknown, the flight hours accumulated by the affected elevator or rudder since its first installation on an airplane apply.
| Flight hours (FH) accumulated | Compliance time |
|---|---|
| Fewer than 1,200 FH | Before exceeding 1,200 FH, or within 30 days after the effective date of this AD, whichever occurs later. |
| 1,200 FH or more | Within 9 months after the effective date of this AD. |
For Group 1 airplanes: Within the applicable compliance time specified in table 1 to paragraphs (g)(4) and (h) of this AD, replace each affected part with a serviceable part, in accordance with the instructions in Airbus Alert Operators Transmission (AOT) A27P012-18, Rev 01, dated May 2018, including Appendixes 2 through 6.
Although Airbus Alert Operators Transmission (AOT) A27P012-18, Rev 01, dated May 2018, specifies to submit certain information to the manufacturer and refers to Appendix 1 of Airbus Alert Operators Transmission (AOT) A27P012-18, Rev 01, dated May 2018, this AD does not include that requirement.
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
