Is AD 2021-10393 a recurring Airworthiness Directive?

Yes — AD 2021-10393 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2021-10393 apply to?

AD 2021-10393 applies to Airbus Helicopters — models SA330J, SA330. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-10393

recurring

AD 2021-10393 · 2021-05-18 · airframe

Airworthiness Directives; Airbus Helicopters (Type Certificate Previously Held by Eurocopter France) Helicopters

What this AD requires

The FAA is superseding Airworthiness Directive (AD) 2010-16- 51, which applied to certain Eurocopter France (now Airbus Helicopters (Airbus)) Model SA330J helicopters. AD 2010-16-51 required inspecting for a gap between the main gearbox (MGB) oil cooling fan assembly (fan) rotor blade and the upper section of the guide vane bearing housing and depending on the results, replacing the two fan rotor shaft bearings with two airworthy bearings. This AD retains the requirements of AD 2010-16-51 and also requires installing improved MGB fan rotor shaft bearings and repetitively inspecting the new improved MGB fan rotor shaft bearings, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. AD 2010-16-51 was prompted by the separation of a fan rotor blade that caused puncture holes in the transmission deck. This new AD was prompted by the development of an improved MGB fan rotor shaft bearing design. The FAA is issuing this AD to address the unsafe condition on these products.

Repetitive inspection. Re-inspect. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2021-10393 applies to

MakesAirbus Helicopters

ModelsSA330J, SA330

Part-conditional — 704A33651114, 205FFTX74K6-G33, 704A33651268, 594918.

Applies to helicopters with main gearbox (MGB) oil cooling fan rotor shaft bearings (both rear and front) part number 704A33651114 (manufacturer P/N 205FFTX74K6-G33) or part number 704A33651268 (manufacturer P/N 594918) installed.

Whether AD 2021-10393 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.

Date — When the work was done.

Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.

Signature & certificate — The A&P/IA who returned it to service, with certificate number.

Is AD 2021-10393 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.