Airworthiness Directive · Amendment 39-21666 · Electrical power system
Leonardo S.p.a. Helicopters
This AD applies to all Leonardo S.p.a. Model AB412 and AB412 EP helicopters, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Leonardo S.p.a. Model AB412 and AB412 EP helicopters. This AD was prompted by a report of the failure of both inverters in-flight, leading to an autopilot disconnection. This AD requires a one-time inspection of the clearance between a certain protective grommet installed in the emergency bus interlock compartment and the cable assemblies passing through it, and depending on the finding, applicable corrective actions, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified in paragraph (h) of this AD: Comply with all required actions and compliance times specified in, and in accordance with, European Union Aviation Safety Agency (EASA) AD 2020-0192, dated September 4, 2020 (EASA AD 2020-0192).
(1) Where EASA AD 2020-0192 refers to its effective date, this AD requires using the effective date of this AD.
(2) Where the service information referenced in EASA AD 2020-0192 specifies to discard a certain part, this AD requires removing that part from service.
(3) Where the service information referenced in EASA AD 2020-0192 specifies to replace a certain part, this AD requires removing that part from service.
(4) Where EASA AD 2020-0192 refers to flight hours (FH), this AD requires using hours time-in-service.
(5) The “Remarks” section of EASA AD 2020-0192 does not apply to this AD.
(6) Where paragraph (2) of EASA AD 2020-0192 refers to “any discrepancy” for this AD, discrepancies include inadequate clearance between the protective grommet and AC power system cable assembly and damaged (chafed) AC power system cable assemblies.
Although the service information referenced in EASA AD 2020-0192 specifies to submit certain information to the manufacturer, this AD does not include that requirement.
