# Proposed AD FAA-2008-0273: Boeing Model 747-400, 747-400D, and 747-400F Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-13-03
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 13, 2008, 73 FR 13480
- Comments due: April 14, 2008
- Became: [AD 2008-13-03](https://openairdocs.org/ad/2008-13-03)
- Docket: FAA-2008-0273 (https://www.regulations.gov/docket/FAA-2008-0273, where comments are filed)
- Project: 2007-NM-369-AD
- FR document: E8-5013
- Official PDF: https://openairdocs.org/files/sha256/a8/d1/a8d1f8329989d0f718f2036b4db6f175c12e77f1d04a03bb8fb59202dbab5b5f (from https://www.govinfo.gov/content/pkg/FR-2008-03-13/pdf/E8-5013.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/03/13/E8-5013/airworthiness-directives-boeing-model-747-400-747-400d-and-747-400f-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/658B66BA665185E38625740C0051439F.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0273

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) that applies to all Boeing Model 747-400, 747-400D, and 747-400F series airplanes. The existing AD currently requires reviewing airplane maintenance records, doing repetitive inspections for cracking of the yaw damper actuator portion of the upper and lower rudder power control modules (PCMs), replacing the PCMs if necessary, and reporting all airplane maintenance records review and inspection results to the manufacturer. This proposed AD would limit the applicability, reduce the initial inspection threshold and repetitive interval, remove the reporting requirement, and require installation of a secondary retention device for the yaw damper modulating piston. Installation of the secondary retention device would terminate the repetitive inspection requirements. This proposed AD results from additional reports of failure or cracking of the PCM manifold in the area of the yaw damper cavity endcap at intervalswell below the initial inspection threshold of the existing AD. We are proposing this AD to prevent an uncommanded left rudder hardover in the event of cracking in the yaw damper actuator portion of the upper or lower rudder PCMs, and subsequent failure of the PCM manifold, which could result in increased pilot workload, and possible runway departure upon landing.

## Notices in this docket

- Mar 13, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-5013, comments due Apr 14, 2008 (https://www.federalregister.gov/documents/2008/03/13/E8-5013/airworthiness-directives-boeing-model-747-400-747-400d-and-747-400f-series-airplanes)

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