# Airworthiness Directives; The Boeing Company Airplanes
> **Rule** · Final rule. · Published 2012-10-03 · Effective 2012-11-07 · 77 FR 60285
## Document
- **Document number:** 2012-23790
- **Category:** airworthiness
- **Manufacturer:** The Boeing Company
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 60285
- **Publication date:** 2012-10-03
- **Effective date:** 2012-11-07
- **FAA docket:** Docket No. FAA-2012-0424
## Abstract

We are adopting a new airworthiness directive (AD) for certain of The Boeing Company Model 777 airplanes. This AD was prompted by heat damage and cracks at the pivot joint location of the main landing gear (MLG) inner cylinder/truck beam. This AD requires repetitive lubrication of the MLG pivot joints; repetitive detailed inspections of the outer diameter chrome on the center axles of the MLG for chicken- wire cracks, corrosion, and chrome plate distress; repetitive magnetic particle inspections of the outer diameter chrome on the center axles of the MLG for cracks; and related investigative and corrective actions if necessary. We are issuing this AD to detect and correct cracking in the MLG center axle and shock strut inner cylinder lugs (pivot joint), which could result in fracture of the MLG pivot joint components and consequent collapse of the MLG.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/10/03/2012-23790/airworthiness-directives-the-boeing-company-airplanes)
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