# Airworthiness Directives; Eurocopter Canada Ltd. Model BO 105 LS A-3 Helicopters
> **Rule** · Final rule; request for comments. · Published 1999-10-18 · Effective 1999-11-02 · 64 FR 56156
## Document
- **Document number:** 99-26713
- **Category:** airworthiness
- **Manufacturer:** Eurocopter Canada Ltd. Model BO 105 LS A-3
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 56156
- **Publication date:** 1999-10-18
- **Effective date:** 1999-11-02
- **FAA docket:** Docket No. 99-SW-56-AD
## Abstract

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 99-20-13, which was sent previously to all known U.S. owners and operators of Eurocopter Canada Ltd. Model BO 105 LS A-3 helicopters by individual letters. This AD requires, before further flight, creating a component log card or equivalent record and determining the age and number of flights on each tension-torsion (TT) strap. The AD also requires inspecting and removing, as necessary, certain unairworthy TT straps. This amendment is prompted by an accident in which a main rotor blade (blade) separated from a Eurocopter Deutschland GMBH Model MBB-BK 117 helicopter because of fatigue failure of the TT strap. The Model MBB-BK 117 and the Model BO 105 LS A-3 helicopters use the same part-numbered TT strap. The actions specified by this AD are intended to prevent failure of a TT strap, loss of a blade, and subsequent loss of control of the helicopter.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/10/18/99-26713/airworthiness-directives-eurocopter-canada-ltd-model-bo-105-ls-a-3-helicopters)
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