# Airworthiness Directives; Boeing Model 737-600, -700, -700C, -800, and -900 Series Airplanes
> **Rule** · Final rule. · Published 2008-04-21 · Effective 2008-05-27 · 73 FR 21227
## Document
- **Document number:** E8-8254
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 73 FR 21227
- **Publication date:** 2008-04-21
- **Effective date:** 2008-05-27
- **FAA docket:** Docket No. FAA-2007-29116
## Abstract

We are adopting a new airworthiness directive (AD) for certain Boeing Model 737-600, -700, -700C, -800, and -900 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 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 caused by 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/2008/04/21/E8-8254/airworthiness-directives-boeing-model-737-600--700--700c--800-and--900-series-airplanes)
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