# Airworthiness Directives; Boeing Model 707 Airplanes and Model 720 and 720B Series Airplanes
> **Rule** · Final rule. · Published 2004-12-09 · Effective 2005-01-13 · 69 FR 71347
## Document
- **Document number:** 04-26794
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 707
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 71347
- **Publication date:** 2004-12-09
- **Effective date:** 2005-01-13
- **FAA docket:** Docket No. FAA-2004-19228
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Boeing Model 707 airplanes and Model 720 and 720B series airplanes. This AD requires repetitive inspections of the left and right support ribs for the main landing gear (MLG) trunnion, related investigative/ corrective actions if necessary, and other specified actions. This AD is prompted by reports of in-service cracking of the support ribs for the MLG trunnion. We are issuing this AD to detect and correct corrosion and cracking of the support ribs for the MLG trunnion, which could result in collapse of the MLG.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/12/09/04-26794/airworthiness-directives-boeing-model-707-airplanes-and-model-720-and-720b-series-airplanes)
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