Is AD 97-12-04 a recurring Airworthiness Directive?

Yes — AD 97-12-04 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 97-12-04 apply to?

AD 97-12-04 applies to General Electric — models GE90-76B, GE90-77B, GE90-85B, GE90-90B, GE90-92B, GE90. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 97-12-04

recurring

Official AD 97-12-04 · FR doc 97-14955 · 1997-06-12 · turbine engine

Airworthiness Directives; General Electric Company GE90 Series Turbofan Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to General Electric Company (GE) GE90 series turbofan engines. This action requires initial and repetitive borescope inspections of compressor discharge pressure (CDP) manifolds for cracks, and replacement, if necessary, with an improved design CDP manifold. In addition, this AD requires, as terminating action to the inspections, replacement with an improved design CDP manifold. This amendment is prompted by reports of CDP manifold cracking that has resulted in liberated material causing high pressure compressor (HPC) blade damage. The actions specified in this AD are intended to prevent inflight engine power loss or shutdown due to HPC blade damage caused by liberated material from the CDP manifold.

Repetitive inspection. Re-inspect. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 97-12-04 applies to

MakesGeneral Electric

ModelsGE90-76B, GE90-77B, GE90-85B, GE90-90B, GE90-92B, GE90

Part-conditional — 1686M48G10, 1686M48G11.

Applies only to engines with compressor discharge pressure (CDP) manifold P/N 1686M48G10 or 1686M48G11 installed.

Whether AD 97-12-04 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 97-12-04 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.