# Airworthiness Directives; Boeing Model 737-600, -700, and -800 Series Airplanes
> **Rule** · Final rule. · Published 1999-12-20 · Effective 2000-01-24 · 64 FR 71010
## Document
- **Document number:** 99-32581
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 71010
- **Publication date:** 1999-12-20
- **Effective date:** 2000-01-24
- **FAA docket:** Docket No. 99-NM-134-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 737-600, -700, and -800 series airplanes, that requires installation of a drain at each of the number 2 window frame assemblies in the airplane. This amendment is prompted by reports that flight deck emergency exits (number 2 windows) were found frozen shut after landing. The actions specified by this AD are intended to prevent water accumulation in the lower corners of the flight deck emergency exits (number 2 windows), which can freeze and prevent the exits from being used during an emergency evacuation.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/12/20/99-32581/airworthiness-directives-boeing-model-737-600--700-and--800-series-airplanes)
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