# Airworthiness Directives; Boeing Model 720 and 720B Series Airplanes
> **Rule** · Final rule; request for comments. · Published 2006-03-17 · Effective 2006-04-03 · 71 FR 13747
## Document
- **Document number:** 06-2545
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 720 and 720B Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 71 FR 13747
- **Publication date:** 2006-03-17
- **Effective date:** 2006-04-03
- **FAA docket:** Docket No. FAA-2006-24162
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Boeing Model 720 and 720B series airplanes. This AD requires repetitive inspections for any crack, corrosion, or sign of damage (e.g., finish scratches, blistering, or signs of fuel leaking) of the front spar upper chords under the fairing web, and repair if necessary. This AD results from a report that inspections required by a previous AD action are inadequate for Boeing Model 720 and 720B series airplanes. We are issuing this AD to detect and correct any crack, corrosion, or sign of damage of the front spar upper chords under the fairing web, which could result in structural failure of the wing.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/03/17/06-2545/airworthiness-directives-boeing-model-720-and-720b-series-airplanes)
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