# Proposed AD FAA-2005-20629: Boeing Model 767-300 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-24-04
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 17, 2005, 70 FR 12986
- Comments due: May 2, 2005
- Became: [AD 2005-24-04](https://openairdocs.org/ad/2005-24-04)
- Docket: FAA-2005-20629 (https://www.regulations.gov/docket/FAA-2005-20629, where comments are filed)
- Project: 2004-NM-266-AD
- FR document: 05-5289
- Official PDF: https://openairdocs.org/files/sha256/c9/72/c9723cf2b5e572c655f3710aa3ae0220de68a2683a87ab2f31d84e4ff431a6bb (from https://www.govinfo.gov/content/pkg/FR-2005-03-17/pdf/05-5289.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/03/17/05-5289/airworthiness-directives-boeing-model-767-300-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/72E9E80C88DD700B86256FC70060AFD0.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20629

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing Model 767-300 series airplanes. This proposed AD would require replacing the frequency converters used to supply power for medical outlets with modified frequency converters, and related actions. This proposed AD is prompted by a report indicating that a hard short circuit condition between the output of certain frequency converters and their downstream circuit breakers will produce a continuous output current that could cause the undersized output wiring to overheat when the frequency converters fail to shut off. We are proposing this AD to prevent overheating of the output wiring of the frequency converters, which could result in the failure of a wire bundle and consequent adverse effects on other systems sharing the affected wire bundle.

## Notices in this docket

- Mar 17, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-5289, comments due May 2, 2005 (https://www.federalregister.gov/documents/2005/03/17/05-5289/airworthiness-directives-boeing-model-767-300-series-airplanes)

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