# Proposed AD FAA-2009-0795: Boeing Model 757 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-06-17
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 29, 2009, 74 FR 49827
- Comments due: November 13, 2009
- Became: [AD 2010-06-17](https://openairdocs.org/ad/2010-06-17)
- Docket: FAA-2009-0795 (https://www.regulations.gov/docket/FAA-2009-0795, where comments are filed)
- Project: 2009-NM-083-AD
- FR document: E9-23421
- Official PDF: https://openairdocs.org/files/sha256/d8/62/d862443dbbc488a9dfe3a9a14598c3945eddbf13757bff9027175cfe4624142c (from https://www.govinfo.gov/content/pkg/FR-2009-09-29/pdf/E9-23421.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/09/29/E9-23421/airworthiness-directives-boeing-model-757-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/18E2F8F5781208DE8625764000640BA5.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0795

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Boeing Model 757 airplanes. This proposed AD would require inspecting to verify the part number of the low-pressure flex-hoses of the flightcrew and supernumerary oxygen system installed under the oxygen mask stowage box at a flightcrew and supernumerary oxygen mask location, and replacing with a new non-conductive low-pressure flex- hose of the oxygen system if necessary. This proposed AD results from reports of a low-pressure flex-hose of a flightcrew oxygen system that burned through due to inadvertent electrical current from a short circuit in an adjacent audio select panel. We are proposing this AD to prevent inadvertent electrical current which can cause the low-pressure flex-hose of a flightcrew or supernumerary oxygen system to melt or burn, resulting in oxygen system leakage and smoke or fire.

## Notices in this docket

- Sep 29, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-23421, comments due Nov 13, 2009 (https://www.federalregister.gov/documents/2009/09/29/E9-23421/airworthiness-directives-boeing-model-757-airplanes)

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