# Proposed AD FAA-2010-0045: The Boeing Company Model 747-100, 747- 100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-16-05
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 22, 2010, 75 FR 3658
- Comments due: March 8, 2010
- Became: [AD 2010-16-05](https://openairdocs.org/ad/2010-16-05)
- Docket: FAA-2010-0045 (https://www.regulations.gov/docket/FAA-2010-0045, where comments are filed)
- Project: 2009-NM-085-AD
- FR document: 2010-1175
- Official PDF: https://openairdocs.org/files/sha256/f3/f2/f3f2ef8bc18b627c288892bd02b85f005f16676495747fd2a7be55650d4943b6 (from https://www.govinfo.gov/content/pkg/FR-2010-01-22/pdf/2010-1175.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/01/22/2010-1175/airworthiness-directives-the-boeing-company-model-747-100-747-100b-747-100b-sud-747-200b-747-200c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D67C9758E519C7A4862576B3004EB8CD.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0045

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Model 747 airplanes. This proposed AD would require inspecting to verify the part number of the low-pressure flex-hoses of the crew oxygen system installed under the oxygen mask stowage boxes in the flight deck, and replacing the flex-hose with a new non-conductive low- pressure flex-hose if necessary. This proposed AD results from reports of low-pressure flex-hoses of the crew oxygen system that burned through due to inadvertent electrical current from a short circuit in the audio select panel. We are proposing this AD to prevent inadvertent electrical current, which can cause the low-pressure flex-hoses of the crew oxygen system to melt or burn, causing oxygen system leakage and smoke or fire.

## Notices in this docket

- Jan 22, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-1175, comments due Mar 8, 2010 (https://www.federalregister.gov/documents/2010/01/22/2010-1175/airworthiness-directives-the-boeing-company-model-747-100-747-100b-747-100b-sud-747-200b-747-200c)

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