# Proposed AD FAA-2007-28664: Boeing Model 777-200, -200LR, -300, and -300ER Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-09-11
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 10, 2007, 72 FR 37475
- Comments due: August 24, 2007
- Became: [AD 2008-09-11](https://openairdocs.org/ad/2008-09-11)
- Docket: FAA-2007-28664 (https://www.regulations.gov/docket/FAA-2007-28664, where comments are filed)
- Project: 2007-NM-007-AD
- FR document: E7-13353
- Official PDF: https://openairdocs.org/files/sha256/57/92/579293d2ab30eb3eb6f05585f4232deb4548b1a9efb0129d1eb67d6d28e41aab (from https://www.govinfo.gov/content/pkg/FR-2007-07-10/pdf/E7-13353.pdf)
- Federal Register: https://www.federalregister.gov/documents/2007/07/10/E7-13353/airworthiness-directives-boeing-model-777-200--200lr--300-and--300er-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/86BD4A30CB0C0E728625731400514877.0001
- Page: https://openairdocs.org/proposed/FAA-2007-28664

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Boeing Model 777-200, -200LR, -300, and -300ER series airplanes. This proposed AD would require a one-time inspection to determine the material of the forward and aft gray water drain masts. For airplanes having composite gray water drain masts, this proposed AD would also require installation of a copper bonding jumper between a ground and the clamp on the tube of the forward and aft gray water composite drain masts. This proposed AD results from a report of charred insulation blankets and burned wires around the forward gray water composite drain mast found during an inspection of the forward cargo compartment on a Model 767-300F airplane. We are proposing this AD to prevent a fire near a composite drain mast and possible disruption of the electrical power system due to a lightning strike on a composite drain mast, which could result in the loss of several functions essential for safe flight.

## Notices in this docket

- Jul 10, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-13353, comments due Aug 24, 2007 (https://www.federalregister.gov/documents/2007/07/10/E7-13353/airworthiness-directives-boeing-model-777-200--200lr--300-and--300er-series-airplanes)

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