Airworthiness directives › 2021-16-06
AD 2021-16-06 Airworthiness Directives; Leonardo S.p.a. Helicopters
Models named: A119, AW119 MKII. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Leonardo S.p.a. Model A119 and AW119 MKII helicopters, certificated in any category, with 90-degree tail rotor gearbox (TGB) part number (P/N) 109-0440-06-101 or 109-0440-06-105, and with TGB shaft P/N 109-0443-03-107 having a serial number (S/N) listed in Table 1 of Leonardo Helicopters Alert Service Bulletin No. 119-090, Revision A, dated September 14, 2020 (ASB 119-090), installed. Note 1 to paragraph (c): A TGB shaft is also referred to as a mast gear assembly.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 25 hours time-in-service (TIS) or 3 months, whichever occurs first after the effective date of this AD, and thereafter at intervals not to exceed 6 months, borescope inspect the entire internal surface of the TGB shaft for corrosion. Refer to Detail A of Figure 1 of ASB 119-090, for a depiction of the entry point for the borescope. If there is corrosion, before further flight, remove the TGB from service. (2) As of the effective date of this AD, do not install on any helicopter any TGB P/N 109-0440-06-101 or 109-0440-06-105 that has TGB shaft P/N 109-0443-03-107 having an S/N listed in Table 1 of ASB 119-090, unless the actions required by paragraph (g)(1) of this AD have been accomplished.
Unsafe condition
This AD was prompted by two occurrences of corrosion on the internal surface of the TGB shaft. The FAA is issuing this AD to detect corrosion of the TGB shaft. The unsafe condition, if not addressed, could result in failure of the tail rotor, possibly resulting in reduced control of the helicopter.
Affected ADs
This AD replaces AD 2020-19-11, Amendment 39-21254 (85 FR 59404, September 22, 2020).
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