Is AD 98-26973 a recurring Airworthiness Directive?

No — AD 98-26973 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-26973 apply to?

AD 98-26973 applies to Pratt & Whitney Canada Pw100. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-26973

one-time

AD 98-26973 · 1998-10-08 · turboprop engine

Airworthiness Directives; Pratt & Whitney Canada PW100 Series Turboprop Engines

What this AD requires

This document makes a correction to Airworthiness Directive (AD) 98-14-02 applicable to Pratt & Whitney Canada (PWC) PW100 series turboprop engines that was published in the Federal Register on July 1, 1998 (63 FR 35794). PWC Service Bulletin (SB) No. 21077, Revision 8, is dated incorrectly. This document corrects the dating of that SB. In all other respects, the original document remains the same.

Which aircraft AD 98-26973 applies to

MakesPratt & Whitney Canada Pw100

Whether AD 98-26973 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 98-26973 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.