Is AD 2018-17-12 a recurring Airworthiness Directive?

No — AD 2018-17-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2018-17-12 apply to?

AD 2018-17-12 applies to General Electric Company — models GE90-76B, GE90-77B, GE90-85B, GE90-90B, GE90-94B, GE90. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2018-17-12

one-time

Official AD 2018-17-12 · FR doc 2018-19282 · 2018-09-07 · turbine engine

Airworthiness Directives; General Electric Company Turbofan Engines

What this AD requires

We are adopting a new airworthiness directive (AD) for all General Electric Company (GE) GE90-76B, GE90-77B, GE90-85B, GE90-90B, and GE90-94B turbofan engines with full authority digital engine control (FADEC) software, version 9.3.2.4 or earlier, installed. This AD requires upgrading the FADEC software to a software version eligible for installation. This AD was prompted by an ice-crystal icing (ICI) event that caused damage to both engines, a single engine stall, and subsequent engine shutdown. We are issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2018-17-12 applies to

MakesGeneral Electric Company

ModelsGE90-76B, GE90-77B, GE90-85B, GE90-90B, GE90-94B, GE90

Applies only to engines with full authority digital engine control (FADEC) software, version 9.3.2.4 or earlier, installed.

Whether AD 2018-17-12 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 2018-17-12 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.