Is AD 2021-13710 a recurring Airworthiness Directive?

Yes — AD 2021-13710 requires a repetitive inspection every 319 hours or 3 months. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2021-13710 apply to?

AD 2021-13710 applies to Airbus Helicopters Deutschland Gmbh — models MBB-BK117 C-2, MBB-BK117 D-2, MBB-BK117. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-13710

recurring

AD 2021-13710 · 2021-06-29 · airframe

Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for Airbus Helicopters Deutschland GmbH (AHD) Model MBB-BK117 C-2 and MBB- BK117 D-2 helicopters. This AD was prompted by a report of increased control force in the collective axis. This AD requires repetitive visual inspections of the main rotor actuator (MRA), 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.

Repetitive inspection. Re-inspect every 319 hours or 3 months. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2021-13710 applies to

MakesAirbus Helicopters Deutschland Gmbh

ModelsMBB-BK117 C-2, MBB-BK117 D-2, MBB-BK117

Whether AD 2021-13710 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 2021-13710 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.