# Proposed AD FAA-2006-25973: Boeing Model 777 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2007-13-05
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 3, 2006, 71 FR 58323
- Comments due: November 17, 2006
- Became: [AD 2007-13-05](https://openairdocs.org/ad/2007-13-05)
- Docket: FAA-2006-25973 (https://www.regulations.gov/docket/FAA-2006-25973, where comments are filed)
- Project: 2006-NM-178-AD
- FR document: E6-16307
- Official PDF: https://openairdocs.org/files/sha256/14/10/1410731319f497ef17c3348fb75a72c867d7c18694b95b9a293d462b9ff490ed (from https://www.govinfo.gov/content/pkg/FR-2006-10-03/pdf/E6-16307.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/10/03/E6-16307/airworthiness-directives-boeing-model-777-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EEE8CEA336050B0B862571FC0051FD49.0001
- Page: https://openairdocs.org/proposed/FAA-2006-25973

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Boeing Model 777 airplanes. This proposed AD would require repetitive measurements of the freeplay of the right and left elevators, rudder, and rudder tab, and related investigative and corrective actions if necessary. This proposed AD would also require repetitive lubrications of the elevator, rudder, and rudder tab components. This proposed AD results from reports of freeplay-induced vibration of unbalanced control surfaces. Excessive freeplay of control surfaces can cause unacceptable airframe vibration during flight. The potential for vibration of the control surface should be avoided because the point of transition from vibration to divergent flutter is unknown. We are proposing this AD to prevent flutter, which can cause damage to the control surface structure and consequent loss of control of the airplane.

## Notices in this docket

- Oct 3, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-16307, comments due Nov 17, 2006 (https://www.federalregister.gov/documents/2006/10/03/E6-16307/airworthiness-directives-boeing-model-777-airplanes)

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