# Airworthiness Directives; Boeing Model 737-100 and -200 Series Airplanes
> **Rule** · Final rule. · Published 2001-08-20 · Effective 2001-09-24 · 66 FR 43463
## Document
- **Document number:** 01-20697
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 737-100 and -200 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 43463
- **Publication date:** 2001-08-20
- **Effective date:** 2001-09-24
- **FAA docket:** Docket No. 99-NM-367-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 737 series airplanes, that requires initial and repetitive inspections of certain areas of the wing spars to detect cracking or corrosion; and follow-on corrective actions and repair, if necessary. This amendment is prompted by reports of cracks and corrosion in the upper chord of the front and rear spars of the wing and reports of cracks propagating from previously repaired areas. The actions specified by this AD are intended to detect and correct such cracking or corrosion of the upper and lower chords of the wing spars, which could result in reduced structural integrity of the wing.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/08/20/01-20697/airworthiness-directives-boeing-model-737-100-and--200-series-airplanes)
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