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Airworthiness Directive

AD 2021-20-10: Leonardo S.p.a. Helicopters

Airworthiness Directives; Leonardo S.p.a. Helicopters

Effective
Nov 22, 2021
Published
Oct 18, 2021
Registered aircraft
1

Models this AD may apply to

AI-extracted — verify against original

Matched from the AD's applicability section. Applicability must be confirmed by a mechanic against the aircraft's records.

Aircraft

  • Leonardo S P A AB139
  • Only with: Applies to helicopters without MGB spherical bearing lock nut P/N 3G6320A09152 installed and with: MGB P/N 3G6320A00131, -00132, -00133, -00134, -00135, -00136, 3G6320A22031, 4G6320A00132 or 4G6320A00133 installed; or MGB P/N 3G320A00133 S/N M23; or MGB P/N 3G6320A00134 with S/N M6, N76, N92, P124, P129, P131, P162, P184, Q230, Q243, Q249, R272, V21, V39, V96, V163, V211, V241, V272, V281, V384, V386 or V622; or MGB P/N 3G6320A00136 with S/N AW1, AW2, AW3, AW5 or AW10.
  • Only with: Applies to helicopters without MGB spherical bearing lock nut P/N 3G6320A09152 installed and with: MGB P/N 3G6320A00131, -00132, -00133, -00134, -00135, -00136, 3G6320A22031, 4G6320A00132 or 4G6320A00133 installed; or MGB P/N 3G320A00133 S/N M23; or MGB P/N 3G6320A00134 with S/N M6, N76, N92, P124, P129, P131, P162, P184, Q230, Q243, Q249, R272, V21, V39, V96, V163, V211, V241, V272, V281, V384, V386 or V622; or MGB P/N 3G6320A00136 with S/N AW1, AW2, AW3, AW5 or AW10.

Applicability

From the AD text
This AD applies to Leonardo S.p.a. Model AB139 and AW139 helicopters, certificated in any category, without main gearbox (MGB) spherical bearing lock nut (lock nut) part number (P/N) 3G6320A09152 installed and with: (1) MGB P/N 3G6320A00131, 3G6320A00132, 3G6320A00133, 3G6320A00134, 3G6320A00135, 3G6320A00136, 3G6320A22031, 4G6320A00132, or 4G6320A00133 installed, or (2) MGB P/N 3G320A00133 with serial number (S/N) M23, or MGB P/N 3G6320A00134, with S/N M6, N76, N92, P124, P129, P131, P162, P184, Q230, Q243, Q249, R272, V21, V39, V96, V163, V211, V241, V272, V281, V384, V386, or V622 installed, or (3) MGB P/N 3G6320A00136 with S/N AW1, AW2, AW3, AW5, or AW10 installed.

Related ADs

Superseded or revised by AD 2022-27-03.

Read the AD in the Federal RegisterReport an error on this page