# Airworthiness Directives; Boeing Model 737-600, -700, and -800 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 2000-04-24 · Effective 2000-05-09 · 65 FR 21633
## Document
- **Document number:** 00-9895
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 65 FR 21633
- **Publication date:** 2000-04-24
- **Effective date:** 2000-05-09
- **FAA docket:** Docket No. 2000-NM-88-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 737-600, -700, and -800 series airplanes. This action requires a one-time inspection to detect cracking of the rear spar stiffeners in the wing center section; and modification of crack-free stiffeners, or repair of cracked stiffeners. This amendment is prompted by a report of severed rear spar stiffeners of the center wing, which resulted in cracking in the adjacent keel beam structure. The actions specified in this AD are intended to prevent failure of the keel beam structure.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/04/24/00-9895/airworthiness-directives-boeing-model-737-600--700-and--800-series-airplanes)
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