# Airworthiness Directives; Eurocopter Model AS350B, B1, B2, B3, BA, D, and AS355E Helicopters
> **Rule** · Final rule; request for comments. · Published 2006-09-12 · Effective 2006-09-27 · 71 FR 53550
## Document
- **Document number:** 06-7560
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 71 FR 53550
- **Publication date:** 2006-09-12
- **Effective date:** 2006-09-27
- **FAA docket:** Docket No. FAA-2006-25773
## Abstract

This amendment adopts a new airworthiness directive (AD) for the specified Eurocopter helicopters. This action requires, within 10 hours time-in-service (TIS), inspecting the tapered housing of each main servo-control (MSC) for a crack. If no crack is found, this AD requires, before further flight, retorquing the upper ball-end attachment nut of the MSC. If a crack is found, this AD requires, before further flight, replacing the MSC with an airworthy MSC. This amendment is prompted by the discovery of cracks in the tapered housings of MSCs. The actions specified in this AD are intended to detect a crack in the MSC tapered housing and to prevent loss of the attachment of the MSC to the upper attachment yoke, loss of the main rotor control, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/09/12/06-7560/airworthiness-directives-eurocopter-model-as350b-b1-b2-b3-ba-d-and-as355e-helicopters)
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