# Airworthiness Directives; Boeing Model 777-200 Series Airplanes
> **Rule** · Final rule. · Published 2001-05-02 · Effective 2001-06-06 · 66 FR 21851
## Document
- **Document number:** 01-10465
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 777-200 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 21851
- **Publication date:** 2001-05-02
- **Effective date:** 2001-06-06
- **FAA docket:** Docket No. 2000-NM-147-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 777-200 series airplanes, that requires replacement of certain existing bushings of the aft trunnion of the outer cylinder of the main landing gear (MLG) with new bushings, and replacement of grease in an undercut on the aft trunnion, if necessary. The actions specified by this AD are intended to prevent stress corrosion cracking and consequent fracture of the aft trunnion of the outer cylinder of the MLG, which could result in collapse of the MLG. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/05/02/01-10465/airworthiness-directives-boeing-model-777-200-series-airplanes)
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