# Airworthiness Directives; BAE Systems (Operations) Limited (Jetstream) Model 4101 Airplanes
> **Rule** · Final rule; request for comments. · Published 2009-02-26 · Effective 2009-03-13 · 74 FR 8732
## Document
- **Document number:** E9-3782
- **Category:** airworthiness
- **Manufacturer:** BAE Systems (Operations) Limited (Jetstream) Model 4101
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 74 FR 8732
- **Publication date:** 2009-02-26
- **Effective date:** 2009-03-13
- **FAA docket:** Docket No. FAA-2009-0034
## Abstract

The FAA is superseding an existing airworthiness directive (AD) that applies to certain British Aerospace (Jetstream) Model 4100 series airplanes. The existing AD currently requires an eddy current conductivity test to measure the conductivity of the upper splice plate of the wing, and related investigative and corrective actions if necessary. This AD revises the applicability to include additional airplanes. This AD results from reports of exfoliation corrosion of the upper splice plate of the wing. We are issuing this AD to detect and correct such corrosion, which could result in reduced structural integrity of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/02/26/E9-3782/airworthiness-directives-bae-systems-operations-limited-jetstream-model-4101-airplanes)
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