Airworthiness Directive · Amendment 39-19378 · Fuselage
Airbus SAS Airplanes
This AD applies to Airbus SAS Model A350-941 airplanes certificated in any category, all manufacturer serial numbers, except those on which Airbus Modification 106695 (or retrofit Modification 110281) and Modification 107824 (or retrofit Modification 107877 and retrofit Modification 108494) have been embodied in production.
We are adopting a new airworthiness directive (AD) for certain Airbus SAS Model A350-941 airplanes. This AD was prompted by the discovery of inadequate corrosion protection in certain areas of the horizontal stabilizer and the rear fuselage cone structure. This AD requires application of sealant and protective treatment on the affected areas of the horizontal stabilizer and the rear fuselage cone structure and, for certain airplanes, modification of the trimmable horizontal stabilizer (THS) torsion box and re-identification of the elevator. We are issuing this AD to address the unsafe condition on these products.
(1) For the purpose of this AD, Group 1 airplanes are those with manufacturer serial numbers (MSNs) listed in Section 1.A., “Applicability” of Airbus Service Bulletin A350-53-P029, dated November 17, 2017.
(2) For the purpose of this AD, Group 2 airplanes are those with MSNs listed in Section 1.A., “Applicability” of Airbus Service Bulletin A350-55-P003, dated November 6, 2017.
(1) For Group 1 airplanes: Before exceeding 36 months since the date of issuance of the original standard airworthiness certificate or date of issuance of the original export certificate of airworthiness, or within 90 days after the effective date of this AD, whichever occurs later, apply sealant and protective treatment on the affected areas of the rear fuselage cone structure, as defined in, and in accordance with the Accomplishment Instructions of Airbus Service Bulletin A350-53-P029, dated November 17, 2017.
(2) For Group 2 airplanes: Before exceeding 36 months since the date of issuance of the original standard airworthiness certificate or date of issuance of the original export certificate of airworthiness, or within 90 days after the effective date of this AD, whichever occurs later, accomplish concurrently the actions specified in paragraphs (h)(2)(i) and (h)(2)(ii) of this AD, in accordance with the Accomplishment Instructions of Airbus Service Bulletin A350-55-P003, dated November 6, 2017.
(i) Apply sealant and protective treatment on the affected areas of the horizontal stabilizer, as defined in Airbus Service Bulletin A350-55-P003, dated November 6, 2017.
(ii) Modify the trimmable horizontal stabilizer (THS) torsion box in zone 330 and 340, and re-identify the elevator in zone 335 and 345.
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
