# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule; request for comments. · Published 2021-05-18 · Effective 2021-06-02 · 86 FR 26826
## Document
- **Document number:** 2021-10562
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 86 FR 26826
- **Publication date:** 2021-05-18
- **Effective date:** 2021-06-02
- **FAA docket:** Docket No. FAA-2021-0270
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737-300, -400, and -500 series airplanes. This AD was prompted by a flap synchro wire failure that may go undetected by the autothrottle (A/T) computer. This AD requires repetitive BITE (built-in test equipment) tests of the A/T computer to detect a flap synchro wire failure, and corrective action if necessary. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/05/18/2021-10562/airworthiness-directives-the-boeing-company-airplanes)
---
*AI Analytics · CC0 1.0*