Is AD 2009-11-01 a recurring Airworthiness Directive?

Yes — AD 2009-11-01 requires a repetitive inspection every 50 hours. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2009-11-01 apply to?

AD 2009-11-01 applies to Mbb — models BK117 A-1, BK117 A-3, BK117 A-4, BK117 B-1, BK117 B-2, BK117 C-1, BK117. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2009-11-01

recurring

Official AD 2009-11-01 · FR doc E9-12320 · 2009-05-28 · airframe

Airworthiness Directives; Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 A-1, A-3, A-4, B-1, B-2, and C-1 Helicopters

What this AD requires

We are superseding an existing airworthiness directive (AD) for the specified ECD model helicopters that currently requires initial and repetitive inspections of the main rotor blade (blade) upper and lower surfaces for bulging. This AD results from mandatory continuing airworthiness information (MCAI) issued by the European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community, based on reported incidents in which a balance weight migrated toward the tip of the blade. The MCAI states that new blades have become available that are not fitted with lead balance weights. The MCAI states that only blades equipped with a lead balance weight may result in the unsafe condition. This AD retains the requirements of the current AD but limits the applicability to those part-numbered blades that are fitted with lead balance weights. The actions are intended to limit the applicability to those blades fitted with lead balance weights that could detach, migrate, and cause severe vibrations leading to blade failure and subsequent loss of control of the helicopter.

Repetitive inspection. Re-inspect every 50 hours. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2009-11-01 applies to

MakesMbb

ModelsBK117 A-1, BK117 A-3, BK117 A-4, BK117 B-1, BK117 B-2, BK117 C-1, BK117

Part-conditional — 117-15001, 117-150021, 117-150061, 117-151321, 117-151341, 117-151341V001, 117-151351, 117-151351V001.

Applies only to helicopters with a main rotor blade of the listed part numbers fitted with a lead balance weight installed.

Whether AD 2009-11-01 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 2009-11-01 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.