# Airworthiness Directives; Learjet Inc. Airplanes
> **Rule** · Final rule. · Published 2021-12-06 · Effective 2022-01-10 · 86 FR 68899
## Document
- **Document number:** 2021-26330
- **Category:** airworthiness
- **Manufacturer:** Learjet Inc.
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 86 FR 68899
- **Publication date:** 2021-12-06
- **Effective date:** 2022-01-10
- **FAA docket:** Docket No. FAA-2021-0157
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Learjet Inc. (Learjet) Model 45 airplanes. This AD was prompted by reports of corrosion found on the upper surface of the lower center wing mid spar splice plate. This AD requires repetitively inspecting the center wing area for corrosion and deterioration of protective treatments, removing any corrosion, and treating any deteriorated areas. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/12/06/2021-26330/airworthiness-directives-learjet-inc-airplanes)
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