# Proposed AD FAA-2004-19540: Boeing Model 757 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-18-18
- Products: Boeing
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: July 6, 2005, 70 FR 38823
- Comments due: August 1, 2005
- Became: [AD 2005-18-18](https://openairdocs.org/ad/2005-18-18)
- Docket: FAA-2004-19540 (https://www.regulations.gov/docket/FAA-2004-19540, where comments are filed)
- Project: 2004-NM-110-AD
- FR document: 05-13221
- Official PDF: https://openairdocs.org/files/sha256/6b/bd/6bbdd5be01eac5be62e104fa1f248b158b81567cac68b39f0724a478af3f8bcd (from https://www.govinfo.gov/content/pkg/FR-2005-07-06/pdf/05-13221.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/07/06/05-13221/airworthiness-directives-boeing-model-757-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/769CC12E4EBF71288625703600659287.0001
- Page: https://openairdocs.org/proposed/FAA-2004-19540

## Summary

The FAA is revising an earlier proposed airworthiness directive (AD) for certain Boeing Model 757 airplanes. The original NPRM would have required inspections of certain wire bundles in the left and right engine-to-wing aft fairings for discrepancies, and related investigative and corrective actions if necessary. The original NPRM was prompted by a report indicating that a circuit breaker for the fuel shutoff valve tripped due to a wire that chafed against the structure in the flammable leakage zone of the aft fairing, causing a short circuit. This action revises the original NPRM by adding a new requirement for installing back-to-back p-clamps between the wire and hydraulic supply tube at the aft end of the right-hand strut only; and associated re-routing of the wire bundles, if necessary; and adding airplanes to the applicability. This action also clarifies the applicability specified in the original NPRM. We are proposing this supplemental NPRM to prevent chafing between the wire bundle and the structure of the aft fairing, which could result in electrical arcing and subsequent ignition of flammable vapors and possible uncontrollable fire.

## Notices in this docket

- Nov 5, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-24728, comments due Dec 20, 2004 (https://www.federalregister.gov/documents/2004/11/05/04-24728/airworthiness-directives-boeing-model-757-airplanes)
- Jul 6, 2005: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document 05-13221, comments due Aug 1, 2005 (https://www.federalregister.gov/documents/2005/07/06/05-13221/airworthiness-directives-boeing-model-757-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.