# Airworthiness Directives; Robinson Helicopter Company Model R44 Helicopters
> **Rule** · Final rule. · Published 2001-10-15 · 66 FR 52312
## Document
- **Document number:** 01-25693
- **Category:** airworthiness
- **Manufacturer:** Robinson Helicopter Company Model R44
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 66 FR 52312
- **Publication date:** 2001-10-15
- **FAA docket:** Docket No. 2000-SW-67-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) for Robinson Helicopter Company (RHC) Model R44 helicopters that requires establishing a life limit of 2200 hours time-in-service (TIS) for affected horizontal stabilizers. This amendment is prompted by engineering analysis which indicates that certain vertical-to- horizontal stabilizer attach channels (channels) will crack sooner than the original life limit of the horizontal stabilizer. The actions specified by this AD are intended to prevent a crack through a channel, separation of the stabilizers, and subsequent loss of directional control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/10/15/01-25693/airworthiness-directives-robinson-helicopter-company-model-r44-helicopters)
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