# Airworthiness Directives; Learjet, Inc. Airplanes
> **Rule** · Final rule. · Published 2018-09-18 · Effective 2018-10-23 · 83 FR 47044
## Document
- **Document number:** 2018-19853
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 83 FR 47044
- **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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/09/18/2018-19853/airworthiness-directives-learjet-inc-airplanes)
---
*AI Analytics · CC0 1.0*