Is AD 2006-08-13 a recurring Airworthiness Directive?

No — AD 2006-08-13 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2006-08-13 apply to?

AD 2006-08-13 applies to Pratt & Whitney Canada — models PW535A, PW500. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2006-08-13

one-time

Official AD 2006-08-13 · FR doc 06-3765 · 2006-04-21 · turbine engine

Airworthiness Directives; Pratt & Whitney Canada (PWC) PW535A Turboshaft Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney Canada (PWC) PW535A turboshaft engines with serial numbers (SNs) lower than DC0241, and with hydromechanical fuel control (HFC) part number (P/N) 819735-4, 819735-5, or 819735-6 installed. This AD requires inspection and verification of the proper adjustment of the ratio unit setscrew adjustment of installed HFC units. This AD results from incidents of PW535A turboshaft engines experiencing lack of response to the power lever input during attempted engine acceleration, due to an incorrect adjustment of the HFC ratio unit setscrew. We are issuing this AD to prevent lack of engine response to power lever input, which could cause a single or dual engine in-flight shutdown event.

Which aircraft AD 2006-08-13 applies to

MakesPratt & Whitney Canada

ModelsPW535A, PW500

Serial-conditional — narrows to serials ?–DC0241.

Part-conditional — 819735-4, 819735-5, 819735-6.

Applies only to engines with serial numbers lower than DC0241 AND with hydromechanical fuel control (HFC) P/N 819735-4, 819735-5, or 819735-6 installed. Serial range 'to' value (DC0241) is exclusive (strictly lower than).

Whether AD 2006-08-13 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 2006-08-13 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.