# Proposed AD FAA-2016-9111: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-04-07
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 22, 2016, 81 FR 65307
- Comments due: November 7, 2016
- Became: [AD 2017-04-07](https://openairdocs.org/ad/2017-04-07)
- Docket: FAA-2016-9111 (https://www.regulations.gov/docket/FAA-2016-9111, where comments are filed)
- Project: 2016-NM-132-AD
- FR document: 2016-22697
- Official PDF: https://openairdocs.org/files/sha256/6e/50/6e50954b8b346e38704d6a7626ad219a0ada4666da9555728199d26e604327bd (from https://www.govinfo.gov/content/pkg/FR-2016-09-22/pdf/2016-22697.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/09/22/2016-22697/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0E911469F1E66DCA86258036004DE90F.0001
- Page: https://openairdocs.org/proposed/FAA-2016-9111

## Summary

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 757 airplanes. This proposed AD was prompted by reports of single and multiple uncommanded spoiler panel extensions during flight when there was a hydraulic system failure. This proposed AD would require replacing certain spoiler power control units (PCUs) with new or changed PCUs. We are proposing this AD to prevent an uncommanded extension of spoiler panels in the event of a hydraulic system failure, which could result in loss of control of the airplane.

## Notices in this docket

- Sep 22, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-22697, comments due Nov 7, 2016 (https://www.federalregister.gov/documents/2016/09/22/2016-22697/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.