# Airworthiness Directives; Boeing Model 757-200 Series Airplanes Modified by Supplemental Type Certificate SA1727GL
> **Rule** · Final rule. · Published 2001-07-11 · Effective 2001-08-15 · 66 FR 36149
## Document
- **Document number:** 01-17155
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 757-200 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 36149
- **Publication date:** 2001-07-11
- **Effective date:** 2001-08-15
- **FAA docket:** Docket No. 2000-NM-228-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to all Boeing Model 757-200 series airplanes modified by Supplemental Type Certificate (STC) SA1727GL, that requires deactivation of the air-to-ground telephone system approved by that STC. This action is necessary to prevent the inability of the flight crew to remove power from the telephone system when necessary. Inability to remove power from the telephone system during a non-normal or emergency situation could result in inability to control smoke or fumes in the airplane flight deck or cabin. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/07/11/01-17155/airworthiness-directives-boeing-model-757-200-series-airplanes-modified-by-supplemental-type)
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