Airworthiness directives › 2021-18-07
AD 2021-18-07 Airworthiness Directives; Leonardo S.p.a. Helicopters
Models named: AB412, AB412 EP. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Leonardo S.p.a. Model AB412 and AB412 EP helicopters, certificated in any category, with a high skid landing gear assembly part number (P/N) 412-050-012-(XXX), 412-050-014-(XXX), 412-050-050-(XXX), or 412-050-059-(XXX), where “(XXX)” represents any 3-digit combination, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For high landing gear aft crosstube P/Ns 412-050-010-101, 412-050-010-107, 412-050-010-111, and 412-050-045-107: (1) Before further flight after the effective date of this AD, determine the total number of landings. 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 number of landings cannot be determined, multiply the total hours time-in-service accumulated by the high landing gear aft crosstube by 4. Remove any high landing gear aft crosstube from service that has accumulated or exceeded 10,000 total landings. (2) Create a component history card or equivalent record to establish a life limit of 10,000 total landings. (3) Thereafter, remove any high landing gear aft crosstube from service before accumulating 10,000 total landings.
Unsafe condition
This AD was prompted by the results of a fatigue review. 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 and subsequent damage to the helicopter and injuries to occupants.
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