Airworthiness directives › 2018-19-19
AD 2018-19-19 Airworthiness Directives; Airbus SAS 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 SAS Model A350-941 airplanes, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Group 1 airplanes are those on which the hydraulic monitoring and control application (HMCA) software (SW) S4.2 is not installed. (2) Group 2 airplanes are those on which HMCA SW S4.2 is installed in production by embodiment of Mod 112090 or installed in-service as specified in Airbus Service Bulletin A350-29-P012.
Unsafe condition
This AD was prompted by a report of an overheat failure mode of the hydraulic engine-driven pump, which could cause a fast temperature rise of the hydraulic fluid. We are issuing this AD to address high hydraulic fluid temperature combined with an inoperative fuel tank inerting system, which could result in uncontrolled overheating of the hydraulic system and consequent ignition sources inside the fuel tank, which, combined with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of 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