Is AD 99-07-04 a recurring Airworthiness Directive?

No — AD 99-07-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 99-07-04 apply to?

AD 99-07-04 applies to Williams International — models FJ44-1A, FJ44. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-07-04

one-time

Official AD 99-07-04 · FR doc 99-6978 · 1999-03-24 · turbine engine

Airworthiness Directives; Williams International, L.L.C. FJ44-1A Turbofan Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to Williams International, L.L.C. FJ44-1A turbofan engines, that requires removing the high pressure turbine (HPT) disk from service prior to accumulating a reduced cyclic life limit of 1,900 cycles since new (CSN) and replacing with a serviceable disk. As an option, the HPT nozzle can be modified, thereby increasing the HPT disk cyclic life limit from the new reduced cyclic life limit. This amendment is prompted by a revised life analysis conducted by the manufacturer after the failure of a similarly designed HPT disk. The actions specified by this AD are intended to prevent HPT disk rim failure, which could result in an uncontained engine failure and damage to the aircraft.

Which aircraft AD 99-07-04 applies to

MakesWilliams International

ModelsFJ44-1A, FJ44

Installed on but not limited to Cessna 525 series aircraft; applies to each identified engine regardless of modification, alteration, or repair status.

Whether AD 99-07-04 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 99-07-04 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.