Airworthiness directives › 2018-07-12
AD 2018-07-12 Airworthiness Directives; Airbus Airplanes
Models named: A350-941. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all Airbus Model A350-941 airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 200 flight cycles or 30 days after the effective date of this AD, whichever occurs first, accomplish a SPPU calibration test in accordance with the Accomplishment Instructions of Airbus Service Bulletin A350-27-P021, dated February 13, 2018. If any fault message appears after accomplishment of the SPPU calibration test, before further flight, apply the corresponding airplane fault isolation and continue with the SPPU calibration test. Repeat the SPPU calibration test thereafter at intervals not to exceed 200 flight cycles.
Unsafe condition
This AD was prompted by a report indicating malfunctions of the station position pick-off unit (SPPU) and failures of the internal wiring due to water ingress via certain electrical connectors, inducing subsequent icing during flight. We are issuing this AD to address a hidden sensor signal drift, which, in combination with an independent failure of a flap down drive disconnect, could lead to in-flight detachment of the outer flap surface, and possibly result in damage to the airplane.
Affected ADs
None.
Read the original on the Federal Register →
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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