# Airworthiness Directives; The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER Series Airplanes
> **Rule** · Final rule. · Published 2010-01-14 · Effective 2010-02-18 · 75 FR 2062
## Document
- **Document number:** 2010-398
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 75 FR 2062
- **Publication date:** 2010-01-14
- **Effective date:** 2010-02-18
- **FAA docket:** Docket No. FAA-2009-0657
## Abstract

We are adopting a new airworthiness directive (AD) for certain Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This AD requires replacing the engine fuel shutoff valves for the left and right main tanks. This AD results from a report of a failed engine start, which was caused by an internally fractured engine fuel shutoff valve. We are issuing this AD to prevent the failure of the valve in the closed position, open position, or partially open position, which could result in engine fuel flow problems and possible uncontrolled fuel leak or fire.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/01/14/2010-398/airworthiness-directives-the-boeing-company-model-737-600--700--700c--800--900-and--900er-series)
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