# Proposed AD 99-NM-134-AD: Boeing Model 737-600, -700, and -800 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 99-26-10
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 14, 1999, 64 FR 37918
- Comments due: August 30, 1999
- Became: [AD 99-26-10](https://openairdocs.org/ad/99-26-10)
- Docket: 99-NM-134-AD
- FR document: 99-17859
- Official PDF: https://openairdocs.org/files/sha256/c1/27/c127fdda7c6355466cca789781bc6c3cc088ad9f70ff17612aa83301e4d0a4d0 (from https://www.govinfo.gov/content/pkg/FR-1999-07-14/pdf/99-17859.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/07/14/99-17859/airworthiness-directives-boeing-model-737-600--700-and--800-series-airplanes
- Page: https://openairdocs.org/proposed/99-NM-134-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 737-600, - 700, and -800 series airplanes. This proposal would require installation of a drain at each of the number 2 window frame assemblies in the airplane. This proposal is prompted by reports that flight deck emergency exits (number 2 windows) were found frozen shut after landing. The actions specified by the proposed 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.

## Notices in this docket

- Jul 14, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-17859, comments due Aug 30, 1999 (https://www.federalregister.gov/documents/1999/07/14/99-17859/airworthiness-directives-boeing-model-737-600--700-and--800-series-airplanes)

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