# Airworthiness Directives; Boeing Model 737-600, -700, and -800 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1999-08-09 · Effective 1999-08-24 · 64 FR 43056
## Document
- **Document number:** 99-20058
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 43056
- **Publication date:** 1999-08-09
- **Effective date:** 1999-08-24
- **FAA docket:** Docket No. 99-NM-188-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 737-600, -700, and -800 series airplanes. This action requires a test of the squib circuit ground studs of the engine fire extinguisher bottles to measure the resistance, and repair or replacement of the ground stud with a new ground stud, if necessary. This amendment is prompted by reports of improper grounding of the squib circuit. Such a condition would prevent the engine fire extinguisher bottle from discharging when commanded, which could result in the inability to extinguish an engine fire.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/08/09/99-20058/airworthiness-directives-boeing-model-737-600--700-and--800-series-airplanes)
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