# Proposed AD FAA-2022-0598: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2024-04-09
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 22, 2022, 87 FR 37249
- Comments due: August 8, 2022
- Became: [AD 2024-04-09](https://openairdocs.org/ad/2024-04-09)
- Docket: FAA-2022-0598 (https://www.regulations.gov/docket/FAA-2022-0598, where comments are filed)
- Project: AD-2021-01322-T
- FR document: 2022-13203
- Official PDF: https://openairdocs.org/files/sha256/99/4d/994dfd5cecc6766009e172732fc3afba4f366d76169b68415a7bb712132e78fc (from https://www.govinfo.gov/content/pkg/FR-2022-06-22/pdf/2022-13203.pdf)
- Federal Register: https://www.federalregister.gov/documents/2022/06/22/2022-13203/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2022-13203-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2022-0598

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 777-200, 777-200LR, 777-300, 777- 300ER, and 777F series airplanes. This proposed AD was prompted by reports of wing anti-ice (WAI) valve failure that can result in undetected structural damage to leading edge (LE) slat assemblies, and separately a failure of the autothrottle (A/T) to disconnect after advancing the throttle levers, which caused a low speed condition during a go-around. This proposed AD was also prompted by a determination that insufficient low-speed protection exists in the 777 fleet and a determination that the flightcrew may not recognize and properly respond to a multi-channel unreliable airspeed event. This proposed AD would require installing certain new software, and doing a software configuration check. The FAA is proposing this AD to address the unsafe conditions on these products.

## Notices in this docket

- Jun 22, 2022: Notice of proposed rulemaking (NPRM). (first notice), FR document 2022-13203, comments due Aug 8, 2022 (https://www.federalregister.gov/documents/2022/06/22/2022-13203/airworthiness-directives-the-boeing-company-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.