# Airworthiness Directives; Boeing Model 747-200C and 747-200F Series Airplanes
> **Rule** · Final rule. · Published 2009-11-03 · Effective 2009-12-08 · 74 FR 56717
## Document
- **Document number:** E9-25918
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 747-200C and 747-200F Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 74 FR 56717
- **Publication date:** 2009-11-03
- **Effective date:** 2009-12-08
- **FAA docket:** Docket No. FAA-2008-1362
## Abstract

We are adopting a new airworthiness directive (AD) for certain Boeing Model 747-200C and 747-200F series airplanes. This AD requires installing larger moisture shrouds and additional drain lines in the electrical/electronic equipment center. This AD results from reports of water contamination in the electrical/electronic units in the main equipment center. We are issuing this AD to prevent water contamination in the electrical/electronic units in the main equipment center, which could result in an electrical short and potential loss of several functions essential for safe flight.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/11/03/E9-25918/airworthiness-directives-boeing-model-747-200c-and-747-200f-series-airplanes)
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