# Proposed AD FAA-2010-1159: The Boeing Company Model 747-400 and - 400D Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-14-11
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 1, 2010, 75 FR 74663
- Comments due: January 18, 2011
- Became: [AD 2011-14-11](https://openairdocs.org/ad/2011-14-11)
- Docket: FAA-2010-1159 (https://www.regulations.gov/docket/FAA-2010-1159, where comments are filed)
- Project: 2010-NM-006-AD
- FR document: 2010-30134
- Official PDF: https://openairdocs.org/files/sha256/33/c4/33c435a5c8f34eba98e5f17f3b8bf2e1b60767471c226018af11ae305e889800 (from https://www.govinfo.gov/content/pkg/FR-2010-12-01/pdf/2010-30134.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/12/01/2010-30134/airworthiness-directives-the-boeing-company-model-747-400-and--400d-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/60399D1CBA5AF315862577EC005170A3.0001
- Page: https://openairdocs.org/proposed/FAA-2010-1159

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Model 747-400 and -400D series airplanes. This proposed AD would require a general visual inspection to determine the routing of the wire bundles in the number two and number three engine pylons near the leading edge, and related investigative and corrective actions, if necessary. For certain airplanes, this proposed AD would also require certain concurrent actions. This proposed AD results from a report of a fuel leak from the drain line of the number two engine pylon. We are proposing this AD to detect and correct chafing of the main fuel feed tube and the alternating current motor-driven hydraulic pump wire bundle, which could lead to arcing from the exposed wire to the fuel feed tube, and could result in a fire or explosion.

## Notices in this docket

- Dec 1, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-30134, comments due Jan 18, 2011 (https://www.federalregister.gov/documents/2010/12/01/2010-30134/airworthiness-directives-the-boeing-company-model-747-400-and--400d-series-airplanes)

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