Is AD 2005-20-12 a recurring Airworthiness Directive?

Yes — AD 2005-20-12 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Airworthiness Directive 2005-20-12

Q: Which aircraft does AD 2005-20-12 apply to?

AD 2005-20-12 applies to Dowty Aerospace Propellers — models R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, R334/4-82-F/13, R321, R324, R333, R334. Serial/part conditions may narrow it to specific aircraft.

recurring

Official AD 2005-20-12 · FR doc 05-20170 · 2005-10-13 · propeller

Airworthiness Directives; Dowty Aerospace Propellers Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, and R334/4-82-F/13 Propeller Assemblies

What this AD requires

The FAA is superseding an existing airworthiness directive (AD) for Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, and R334/4- 82-F/13 propeller assemblies. That AD currently requires initial and repetitive ultrasonic inspections of propeller hubs, part number (P/N) 660709201. This AD requires the same initial and repetitive ultrasonic inspections, but reduces the initial and repetitive compliance times for Type R334/4-82-F/13 propeller assemblies when used on Construcciones Aeronauticas, S.A. (CASA) 212 airplanes. This AD results from a report of a hub separation on a CASA 212 airplane. We are issuing this AD to prevent propeller hub failure due to cracks in the hub, which could result in loss of control of the airplane.

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 2005-20-12 applies to

MakesDowty Aerospace Propellers

ModelsR321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, R334/4-82-F/13, R321, R324, R333, R334

Part-conditional — 660709201.

Applies to propeller assemblies with hub part number 660709201. Installed on, but not limited to, CASA 212, British Aerospace Regional Aircraft Jetstream 3101/3201, Fairchild Merlin IIIC, and Merlin IVC/Metro III airplanes.

Whether AD 2005-20-12 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 2005-20-12 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.