# Airworthiness Directives; Boeing Model 707 and 720 Series Airplanes
> **Rule** · Final rule. · Published 2001-08-29 · Effective 2001-10-03 · 66 FR 45572
## Document
- **Document number:** 01-21493
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 707 and 720 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 45572
- **Publication date:** 2001-08-29
- **Effective date:** 2001-10-03
- **FAA docket:** Docket No. 2000-NM-378-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 707 and 720 series airplanes, that requires a preventive modification of the front spar fitting on the outboard engine nacelle. This action is necessary to prevent fatigue cracking of the front spar fitting on the outboard engine nacelle, which could reduce the structural integrity of the nacelle, and result in separation of the engine from the airplane. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/08/29/01-21493/airworthiness-directives-boeing-model-707-and-720-series-airplanes)
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