Airworthiness directives › 2021-16-04
AD 2021-16-04 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 all Leonardo S.p.a. Model AB412 and AB412 EP helicopters, certificated in any category.
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, European Union Aviation Safety Agency (EASA) AD 2020-0192, dated September 4, 2020 (EASA AD 2020-0192).
Unsafe condition
This AD was prompted by a report of the failure of both inverters in-flight, leading to an autopilot disconnection. Subsequent inspection identified chafing of a wire in the alternating current (AC) power system cable assembly, due to a protective grommet incorrectly installed in the emergency bus interlock compartment. Insufficient clearance between a protective grommet and the cable assemblies that pass through it could result in damage (including chafing) to the cable assemblies. The FAA is issuing this AD to address incorrect installation of a protective grommet in the emergency bus interlock compartment and chafed wiring in the AC power system cable assembly. Chafed wiring in the AC power system cable assembly, if not addressed, could lead to a short in the AC power system, resulting in autopilot failure, possibly the loss of other avionics systems, increased pilot workload, and reduced 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