# Airworthiness Directives; Embraer S.A. (Type Certificate Previously Held by Yaborã Indústria Aeronáutica S.A.; Embraer S.A.) Airplanes
> **Rule** · Final rule; request for comments. · Published 2023-12-27 · Effective 2024-01-11 · 88 FR 89286
## Document
- **Document number:** 2023-28335
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 88 FR 89286
- **Publication date:** 2023-12-27
- **Effective date:** 2024-01-11
- **FAA docket:** Docket No. FAA-2023-2153
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Embraer S.A. Model ERJ 190-400 airplanes. This AD was prompted by a report of unexpected wear on the wing hinge bearing assembly of the aileron surfaces found during the functional test of the aileron control system backlash. This AD requires repetitive inspections of the press-fitted bushings of the wing ailerons for migration and broken sealant, measurements of the distance between the aileron surfaces and hinge fittings, functional checks of the backlash of the wing aileron control system, and all applicable related investigative and corrective actions, as specified in an Ag[ecirc]ncia Nacional de Avia[ccedil][atilde]o Civil (ANAC) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2023/12/27/2023-28335/airworthiness-directives-embraer-sa-type-certificate-previously-held-by-yabor-indstria-aeronutica-sa)
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