# Proposed AD FAA-2016-6898: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-25-26
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 13, 2016, 81 FR 38113
- Comments due: July 28, 2016
- Became: [AD 2016-25-26](https://openairdocs.org/ad/2016-25-26)
- Docket: FAA-2016-6898 (https://www.regulations.gov/docket/FAA-2016-6898, where comments are filed)
- Project: 2016-NM-010-AD
- FR document: 2016-13734
- Official PDF: https://openairdocs.org/files/sha256/7a/8c/7a8cd562c35308a0cfa406af6b365d426540d028ff80e05859150611bbfe147a (from https://www.govinfo.gov/content/pkg/FR-2016-06-13/pdf/2016-13734.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/06/13/2016-13734/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8276BD16435B9A5886257FD10047536A.0001
- Page: https://openairdocs.org/proposed/FAA-2016-6898

## Summary

We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model MD-90-30 airplanes. This proposed AD was prompted by reports of stick shaker activation at airspeeds that were above the stall protection system's stick shaker schedule. This proposed AD would require installing angle-of-attack (AOA) sensor external case heaters and AOA sensors, changing wires, and doing a functional test and applicable corrective actions. We are proposing this AD to correct water intrusion and subsequent ice formation between the AOA sensor vane and face plate, which could cause the vane to become immobilized. If the vane becomes immobilized, the stall protection system could become unreliable or non-functional, which could result in loss of control of the airplane.

## Notices in this docket

- Jun 13, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-13734, comments due Jul 28, 2016 (https://www.federalregister.gov/documents/2016/06/13/2016-13734/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.