Airworthiness Directive · Amendment 39-19243 · Flight controls
Airbus Airplanes
This AD applies to all Airbus Model A350-941 airplanes, certificated in any category.
We are adopting a new airworthiness directive (AD) for all Airbus Model A350-941 airplanes. This AD requires performing repetitive station position pick-off unit (SPPU) calibration tests, and applying the corresponding airplane fault isolation if necessary. This AD was prompted by a report indicating malfunctions of the 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 the unsafe condition on these products.
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.
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
