Is AD 2004-20-01 a recurring Airworthiness Directive?

Yes — AD 2004-20-01 requires a repetitive inspection every 1500 hours. Next-due depends on the aircraft's time in service.

Airworthiness Directive 2004-20-01

Q: Which aircraft does AD 2004-20-01 apply to?

AD 2004-20-01 applies to Pratt & Whitney Canada — models PW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B. Serial/part conditions may narrow it to specific aircraft.

recurring

Official AD 2004-20-01 · FR doc 04-21911 · 2004-10-01 · turboprop engine

Airworthiness Directives; Pratt & Whitney Canada Models PW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B, PW126A, PW127, PW127E, PW127F, and PW127G Turboprop Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney Canada (PWC) models PW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B, PW126A, PW127, PW127E, PW127F, and PW127G turboprop engines. This AD requires initial and repetitive gap inspections of the bypass valve cover, on certain part number (P/N) mechanical fuel controls (MFCs), and replacement of those MFCs as mandatory terminating action to the repetitive inspections. This AD is prompted by sixteen reports of loss of engine throttle response and overspeed, eight of which resulted in in-flight shutdown. We are issuing this AD to prevent loss of throttle response and overspeed, resulting in engine in-flight shutdown.

Repetitive inspection. Re-inspect every 1500 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 2004-20-01 applies to

MakesPratt & Whitney Canada

ModelsPW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B, PW126A, PW127, PW127E, PW127F, PW127G, PW124, PW125, PW126

Part-conditional — 3244841-21, 3244853-17, 3244855-15, 3244857-14, 3244858-23, 3244871-5, 3244873-4, 3244874-4.

Applies only to engines with a mechanical fuel control (MFC) bearing one of the listed part numbers installed.

Whether AD 2004-20-01 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 2004-20-01 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.