# Airworthiness Directives; Boeing Model 737-100, -200, and -200C Series Airplanes
> **Rule** · Final rule. · Published 2001-08-27 · Effective 2001-10-01 · 66 FR 44947
## Document
- **Document number:** 01-21393
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 44947
- **Publication date:** 2001-08-27
- **Effective date:** 2001-10-01
- **FAA docket:** Docket No. 99-NM-310-AD
## Abstract

This amendment adopts a new airworthiness directive (AD); applicable to certain Boeing Model 737-100, -200, and -200C series airplanes; that requires repetitive inspections of certain floor beams and transverse beams, and corrective actions, if necessary. For certain airplanes, this AD also provides optional terminating action for the repetitive inspections. The actions specified by this AD are intended to detect and correct cracking at the aileron control quadrant cutouts and in the cabin floor beams and pressure web transverse beams above the main wheel well, which could result in rapid loss of cabin pressure and reduced structural integrity of the airframe.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/08/27/01-21393/airworthiness-directives-boeing-model-737-100--200-and--200c-series-airplanes)
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