Is AD 98-13-20 a recurring Airworthiness Directive?

No — AD 98-13-20 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-13-20 apply to?

AD 98-13-20 applies to Rolls-Royce, Snecma — models Olympus 593 Mk. 610-14-28, Olympus 593. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-13-20

one-time

Official AD 98-13-20 · FR doc 98-16270 · 1998-06-25 · turbine engine

Airworthiness Directives; Rolls-Royce Limited, Aero Division- Bristol, S.N.E.C.M.A., Olympus 593 Series Turbojet Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to Rolls-Royce Limited, Aero Division-Bristol, S.N.E.C.M.A, Olympus 593 series turbojet engines. This action requires a radiological inspection of the combustion chamber No. 2 outer cooling ring scoop circumferential and axial weld for weld quality, and reweld and reinspection, if necessary; and an inspection of the combustion chamber No. 2 inner and outer cooling ring web length, marking acceptable components with the letter ``T'' adjacent to the part number, and replacement of unacceptable components with serviceable parts. This amendment is prompted by reports of circumferential cracks at the No. 2 outer and inner rings of the combustor chamber, resulting in a section of the combustion chamber detaching and causing significant ignitor and low pressure turbine damage. The actions specified in this AD are intended to prevent combustion chamber detachment, which could result in an inflight engine shutdown or an engine fire.

Which aircraft AD 98-13-20 applies to

MakesRolls-RoyceSnecma

ModelsOlympus 593 Mk. 610-14-28, Olympus 593

Installed on but not limited to British Aerospace/Aerospatiale Concorde series aircraft; applies to each identified engine regardless of modification, alteration, or repair status.

Whether AD 98-13-20 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 98-13-20 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.