# Airworthiness Directives; Boeing Model 737-600, -700, -700C, -800 and -900 Series Airplanes
> **Rule** · Final rule. · Published 2009-01-23 · Effective 2009-02-27 · 74 FR 4117
## Document
- **Document number:** E8-31395
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 74 FR 4117
- **Publication date:** 2009-01-23
- **Effective date:** 2009-02-27
- **FAA docket:** Docket No. FAA-2007-28283
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 737-600, -700, -700C, -800 and -900 series airplanes. This AD requires a one-time general visual inspection of frames between body station (BS) 360 and BS 907 to determine if certain support brackets of the air conditioning (A/C) outlet extrusions are installed; medium- and high-frequency eddy current inspections for cracking of the frames around the attachment holes of the subject brackets; and repair if necessary. This AD also requires installing new, improved fittings for all support brackets of the A/C outlet extrusions between BS 360 and BS 907. This AD results from numerous reports of multiple cracks in the frames around the attachment holes of certain support brackets of the A/C outlet extrusions. We are issuing this AD to prevent frame cracking, which, if not corrected, could lead to a severed frame that, combined with cracking of the skin lap splice above stringer 10, could result in rapid decompression of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2009/01/23/E8-31395/airworthiness-directives-boeing-model-737-600--700--700c--800-and--900-series-airplanes)
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