# Proposed AD FAA-2005-22471: Boeing Model 757 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-07-23
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 21, 2005, 70 FR 55321
- Comments due: November 7, 2005
- Became: [AD 2006-07-23](https://openairdocs.org/ad/2006-07-23)
- Docket: FAA-2005-22471 (https://www.regulations.gov/docket/FAA-2005-22471, where comments are filed)
- Project: 2005-NM-142-AD
- FR document: 05-18795
- Official PDF: https://openairdocs.org/files/sha256/ee/b3/eeb3be26bd91b9897b0850a3abeebe3c7524d00fe4d425bf8049fc1b9007530d (from https://www.govinfo.gov/content/pkg/FR-2005-09-21/pdf/05-18795.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/09/21/05-18795/airworthiness-directives-boeing-model-757-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BB0D71E236EF000A86257083006AEB19.0001
- Page: https://openairdocs.org/proposed/FAA-2005-22471

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Boeing Model 757 airplanes. This proposed AD would require repetitive measurements of the freeplay of each of the three power control units (PCUs) that move the rudder; repetitive lubrication of rudder components; and corrective actions if necessary. This proposed AD results from a report of freeplay-induced vibration of the rudder. We are proposing this AD to prevent excessive vibration of the airframe during flight, which could result in divergent flutter and loss of control of the airplane.

## Notices in this docket

- Sep 21, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-18795, comments due Nov 7, 2005 (https://www.federalregister.gov/documents/2005/09/21/05-18795/airworthiness-directives-boeing-model-757-airplanes)

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