# Airworthiness Directives; Boeing Model 777-200, -300, and -300ER Series Airplanes
> **Rule** · Final rule. · Published 2008-05-02 · Effective 2008-06-06 · 73 FR 24153
## Document
- **Document number:** E8-9113
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 73 FR 24153
- **Publication date:** 2008-05-02
- **Effective date:** 2008-06-06
- **FAA docket:** Docket No. FAA-2007-28664
## Abstract

We are adopting a new airworthiness directive (AD) for all Boeing Model 777-200, -300, and -300ER series airplanes. This AD requires 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 AD also requires installation of a bonding jumper between a ground and the clamp on the tube of the forward and aft gray water composite drain masts. This 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 issuing 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/05/02/E8-9113/airworthiness-directives-boeing-model-777-200--300-and--300er-series-airplanes)
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