Is AD 98-17-01 a recurring Airworthiness Directive?

No — AD 98-17-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-17-01 apply to?

AD 98-17-01 applies to Alliedsignal — models TFE731-2, TFE731-3, TFE731-4, TFE731. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-17-01

one-time

Official AD 98-17-01 · FR doc 99-24700 · 1999-09-29 · turbine engine

Airworthiness Directives; AlliedSignal Inc. TFE731 Series Turbofan Engines

What this AD requires

This amendment revises an existing airworthiness directive (AD), applicable to AlliedSignal Inc. TFE731 series turbofan engines, that currently requires installation of an improved flexible (flex) fuel tube. This amendment clarifies that installation of the improved flex fuel tube and that the use of a clamp on the original rigid fuel tube are optional for engines installed on Learjet 35, 36, and 55 series airplanes. This amendment is prompted by confusion from operators regarding the applicability of these Learjet engine installations. The actions specified by this AD are intended to prevent cracking of the fuel tube and the subsequent leakage of fuel on or around electrical components, which can cause an engine fire.

Which aircraft AD 98-17-01 applies to

MakesAlliedsignal

ModelsTFE731-2, TFE731-3, TFE731-4, TFE731

Part-conditional — 3071051-1, 3073729-1, 3072886-1.

Applies only to engines with fuel tubes of these part numbers installed.

Whether AD 98-17-01 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 98-17-01 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.