Is AD 98-18772 a recurring Airworthiness Directive?

No — AD 98-18772 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-18772 apply to?

AD 98-18772 applies to Aerospatiale — models ATR72. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-18772

one-time

AD 98-18772 · 1998-07-16 · airframe

Airworthiness Directives; Aerospatiale Model ATR42 and ATR72 Series Airplanes

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to certain Aerospatiale Model ATR42 and ATR72 series airplanes, that requires a one-time inspection of the electromagnetic interference (EMI) filter capacitors and electronic cards of the cabin air recirculation fans to detect damage. This amendment also requires replacement of damaged components with new or serviceable parts, and modification of the cabin air assembly fans. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent overheating and consequent failure of the EMI filter capacitors, which could result in emission of toxic smoke and fumes throughout the airplane, and consequent adverse effects on flight crew and passengers.

Which aircraft AD 98-18772 applies to

MakesAerospatiale

ModelsATR72

certain

Whether AD 98-18772 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 98-18772 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.