Is AD 2006-25-12 a recurring Airworthiness Directive?

No — AD 2006-25-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2006-25-12 apply to?

AD 2006-25-12 applies to Rolls-Royce Corporation — models 501-D. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2006-25-12

one-time

Official AD 2006-25-12 · FR doc E6-21352 · 2006-12-19 · turboprop engine

Airworthiness Directives; Rolls-Royce Corporation 501-D Series Turboprop Engines

What this AD requires

The FAA is superseding an existing airworthiness directive (AD) for Rolls-Royce Corporation (RRC) 501-D series turboprop engines. That AD requires removal from service of certain turbine rotor components at reduced life limits. This AD requires the same actions but adds two new life limits. This AD results from RRC reevaluating and revising component life limits for 501-D22 series turboprop engines. We are issuing this AD to prevent uncontained turbine rotor failure resulting in an in-flight engine shutdown and possible damage to the airplane.

Which aircraft AD 2006-25-12 applies to

MakesRolls-Royce Corporation

Models501-D

Whether AD 2006-25-12 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 2006-25-12 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.