# Airworthiness Directives; Kaman Aerospace Corporation (Kaman) Model K-1200 Helicopters
> **Rule** · Final rule; request for comments. · Published 2010-12-21 · Effective 2011-01-05 · 75 FR 79950
## Document
- **Document number:** 2010-31960
- **Category:** airworthiness
- **Manufacturer:** Kaman Aerospace Corporation (Kaman) Model K-1200
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 75 FR 79950
- **Publication date:** 2010-12-21
- **Effective date:** 2011-01-05
- **FAA docket:** Docket No. FAA-2010-1253
## Abstract

We are adopting a new airworthiness directive (AD) for the Kaman Model K-1200 helicopters. This AD requires revising the Limitations section of the Instructions for Continued Airworthiness (ICA) by establishing a life limit of 8,000 hours time-in-service (TIS) for each main rotor blade (blade) set. Also, this AD requires removing each blade set from service if it has accumulated 8,000 or more hours time-in-service (TIS). This AD also requires replacing certain blade sets with airworthy blade sets at specified intervals based on the blade set serial number (S/N). This AD was prompted by an accident and the subsequent discovery of cracks in multiple blade spars. We are issuing this AD to prevent blade failure and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/12/21/2010-31960/airworthiness-directives-kaman-aerospace-corporation-kaman-model-k-1200-helicopters)
---
*AI Analytics · CC0 1.0*