Is AD 98-21-01 a recurring Airworthiness Directive?

No — AD 98-21-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-21-01 apply to?

AD 98-21-01 applies to International Aero Engines — models V2500-A1, V2500. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-21-01

one-time

Official AD 98-21-01 · FR doc 98-26529 · 1998-10-06 · turbine engine

Airworthiness Directives; International Aero Engines AG (IAE) V2500-A1 Series Turbofan Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to International Aero Engines AG (IAE) V2500-A1 series turbofan engines. This action requires a one-time ultrasonic inspection of fan blade roots for cracks, and, if necessary, replacement of cracked fan blades with serviceable parts. This amendment is prompted by a report of dovetail root cracks visually detected on three fan blades from one engine during a routine inspection. The actions specified in this AD are intended to prevent fan blade root cracks, which could result in fan blade root failures, an uncontained engine failure, and damage to the aircraft.

Which aircraft AD 98-21-01 applies to

MakesInternational Aero Engines

ModelsV2500-A1, V2500

Whether AD 98-21-01 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 98-21-01 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.