# Airworthiness Directives; Kaman Aerospace Corporation (Kaman) Helicopters
> **Rule** · Final rule. · Published 2015-07-13 · Effective 2015-08-17 · 80 FR 39941
## Document
- **Document number:** 2015-16939
- **Category:** airworthiness
- **Manufacturer:** Kaman Aerospace Corporation (Kaman)
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 80 FR 39941
- **Publication date:** 2015-07-13
- **Effective date:** 2015-08-17
- **FAA docket:** Docket No. FAA-2014-0758
## Abstract

We are adopting a new airworthiness directive (AD) for Kaman Model K-1200 helicopters with certain main rotor blades (MRB) installed. This AD requires inspecting each MRB for a crack or damage. This AD was prompted by a report that a crack was found on an MRB during a tear-down inspection. The actions are intended to detect a crack in the MRB, which could lead to failure of the MRB and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/07/13/2015-16939/airworthiness-directives-kaman-aerospace-corporation-kaman-helicopters)
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