Airworthiness Directives; General Electric Company Turbofan Engines
airworthiness · Rule · Final rule. · Published 2021-11-23 · Effective 2021-12-28 · 86 FR 66447
Document
Document number
2021-25491
Federal Register citation
86 FR 66447
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
General Electric Company Turbofan
Publication date
2021-11-23
Effective date
2021-12-28
FAA docket
Docket No. FAA-2021-0273
Abstract
The FAA is adopting a new airworthiness directive (AD) for all General Electric Company (GE) GEnx-1B64, GEnx-1B64/P1, GEnx-1B64/P2, GEnx-1B67, GEnx-1B67/P1, GEnx-1B67/P2, GEnx-1B70, GEnx-1B70/75/P1, GEnx-1B70/75/P2, GEnx-1B70/P1, GEnx-1B70/P2, GEnx-1B70C/P1, GEnx-1B70C/ P2, GEnx-1B74/75/P1, GEnx-1B74/75/P2, GEnx-1B76/P2, GEnx-1B76A/P2, GEnx-2B67, GEnx-2B67/P, and GEnx-2B67B model turbofan engines. This AD was prompted by an in-service occurrence of loss of engine thrust control resulting in uncommanded high thrust. This AD requires revising the operator's existing FAA-approved minimum equipment list (MEL) by incorporating into the MEL the dispatch restrictions listed in this AD. This AD also requires initial and repetitive replacement of the electronic engine control (EEC) MN4 microprocessor. The FAA is issuing this AD to address the unsafe condition on these products.