# Proposed AD FAA-2005-23357: Boeing Model 777-200 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-05-08
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 20, 2005, 70 FR 75428
- Comments due: February 3, 2006
- Became: [AD 2006-05-08](https://openairdocs.org/ad/2006-05-08)
- Docket: FAA-2005-23357 (https://www.regulations.gov/docket/FAA-2005-23357, where comments are filed)
- Project: 2005-NM-207-AD
- FR document: 05-24243
- Official PDF: https://openairdocs.org/files/sha256/c1/d2/c1d20d0d797f46aa2cd6683a19f8869af15bd15090342bb24c061e17ad2ffe56 (from https://www.govinfo.gov/content/pkg/FR-2005-12-20/pdf/05-24243.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/12/20/05-24243/airworthiness-directives-boeing-model-777-200-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/282EFAD4F8539EBB862570DD006EC441.0001
- Page: https://openairdocs.org/proposed/FAA-2005-23357

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing Model 777-200 series airplanes. This proposed AD would require installing a new washer between the lower wing surface and the jam nut of the sump drain valve assembly. This proposed AD results from fuel system reviews conducted by the manufacturer. We are proposing this AD to prevent energy from a lightning strike on the bushing for the sump drain valve from arcing to the inside of the center fuel tank wall, which could create an ignition source in the fuel tank and result in a fuel tank explosion.

## Notices in this docket

- Dec 20, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-24243, comments due Feb 3, 2006 (https://www.federalregister.gov/documents/2005/12/20/05-24243/airworthiness-directives-boeing-model-777-200-series-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.