# Airworthiness Directives; Boeing Model 757 Series Airplanes
> **Rule** · Final rule. · Published 2001-10-16 · Effective 2001-11-20 · 66 FR 52492
## Document
- **Document number:** 01-25617
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 757 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 52492
- **Publication date:** 2001-10-16
- **Effective date:** 2001-11-20
- **FAA docket:** Docket No. 98-NM-225-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 757 series airplanes, that requires revising the Airworthiness Limitations Section of the maintenance manual (757 Airworthiness Limitations Instructions (ALI)). The revision will incorporate into the ALI certain inspections and compliance times to detect fatigue cracking of principal structural elements (PSE). This amendment is prompted by analysis of data that identified specific initial inspection thresholds and repetitive inspection intervals for certain PSEs to be added to the ALI. The actions specified by the proposed AD are intended to ensure that fatigue cracking of various PSEs is detected and corrected; such fatigue cracking could adversely affect the structural integrity of these airplanes.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/10/16/01-25617/airworthiness-directives-boeing-model-757-series-airplanes)
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