Airworthiness directives › 2021-18-11
AD 2021-18-11 Airworthiness Directives; Leonardo S.p.a. Helicopters
Models named: AB139, AW139. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Leonardo S.p.a. Model AB139 and AW139 helicopters, certificated in any category, with an affected part as identified in European Aviation Safety Agency (now European Union Aviation Safety Agency) (EASA) AD 2018-0292, dated December 28, 2018 (EASA AD 2018-0292).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Except as specified in paragraph (h) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, EASA AD 2018-0292.
Unsafe condition
This AD was prompted by a report that, during a post-flight inspection of an in-service helicopter, a tail rotor slider assembly was found fractured, and the bushing and the actuator rod in the tail rotor servo were partially damaged. The FAA is issuing this AD to address corrosion in the tail rotor slider assembly caused by improper refinishing (characterized by signs of circumferential refinishing consistent with sanding). The unsafe condition, if not addressed, could result in fatigue cracks and fracture of the tail rotor slider assembly, resulting in failure of the tail rotor controls and consequent loss of yaw control of the helicopter.
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