Airworthiness directives › 2018-17-25
AD 2018-17-25 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 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. Table 1 to Paragraphs ( g )(4) and ( h ) of This AD—Servocontrols Replacement 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.
Unsafe condition
This AD was prompted by reports of uncommanded motion of the flight control actuator. We are issuing this AD to address blocked receiver ports on certain servocontrols installed on the elevators and rudders. This condition, if not corrected, could lead to an uncommanded flight control actuator movement, or an unresponsive flight control actuator while in active mode, possibly resulting in reduced controllability 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