airworthiness · Rule · Final rule. · Published 2018-09-18 · Effective 2018-10-23 · 83 FR 47044
Document
Document number
2018-19853
Federal Register citation
83 FR 47044
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
2018-09-18
Effective date
2018-10-23
FAA docket
Docket No. FAA-2018-0327
Abstract
We are adopting a new airworthiness directive (AD) for certain Learjet, Inc. Models 28, 29, 31, 31A, 35, 35A, 36, 36A, 55, 55B, 55C, and 60 airplanes. This AD was prompted by fatigue cracks initiating in the flap support structure due to repetitive flap loads, which has caused flap nose roller support bracket failure. This AD requires replacement of the flap nose roller fitting, nose roller support bracket, and adjacent rib support structure with improved components. We are issuing this AD to address the unsafe condition on these products.