Airworthiness directives › 2021-17-16
AD 2021-17-16 Airworthiness Directives; Leonardo S.p.a. Helicopters
Models named: AW189. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Leonardo S.p.a. Model AW189 helicopters, certificated in any category, with tail gearbox fitting part number (P/N) 4F5350A04152 installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Before further flight after the effective date of this AD: (1) Determine the total hours time-in-service (TIS) and total number of landings of tail gearbox fitting P/N 4F5350A04152. For purposes of this AD, a landing is counted anytime a helicopter lifts off into the air and then lands again regardless of the duration of the landing and regardless of whether the engine is shutdown. If the total hours TIS and total number of landings cannot be determined, before further flight, remove the part from service. (2) Remove any part from service that has reached or exceeded its life limit as follows. Thereafter, remove any part from service on or before reaching its life limit as follows. Tail gearbox fitting P/N 4F5350A04152: 14,600 total hours TIS or 57,300 total landings, whichever occurs first.
Unsafe condition
This AD was prompted by fatigue testing and analyses. The FAA is issuing this AD to prevent parts from remaining in service beyond their fatigue life. The unsafe condition, if not addressed, could result in failure of a part, which could result in loss of 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