# Proposed AD 99-SW-68-AD: Eurocopter Canada Ltd. Model BO 105 LS A-3 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-18-13
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 19, 2000, 65 FR 37924
- Comments due: August 18, 2000
- Became: [AD 2000-18-13](https://openairdocs.org/ad/2000-18-13)
- Docket: 99-SW-68-AD
- FR document: 00-15425
- Official PDF: https://openairdocs.org/files/sha256/dd/34/dd34a5845b7f4b1c939dc19a230aa3e1ed809df766d14dbbee27aeab59d1cc3b (from https://www.govinfo.gov/content/pkg/FR-2000-06-19/pdf/00-15425.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/06/19/00-15425/airworthiness-directives-eurocopter-canada-ltd-model-bo-105-ls-a-3-helicopters
- Page: https://openairdocs.org/proposed/99-SW-68-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to Eurocopter Canada Ltd. Model BO 105 LS A-3 helicopters. That AD currently requires, before further flight, creating a component log card or equivalent record, and determining the calendar age and number of flights on each tension- torsion (TT) strap, and inspecting and removing, as necessary, certain unairworthy TT straps. This action would establish a life limit for certain main rotor TT straps. This proposal is prompted by an accident in which a main rotor blade (blade) separated from a Eurocopter Deutschland GMBH (ECD) Model MBB-BK 117 helicopter due to fatigue failure of a TT strap. The same part-numbered TT strap is used on the Model BO 105 LS A-3 helicopters. The actions specified by this AD are intended to prevent fatigue failure of a TT strap, loss of a blade, and subsequent loss of control of the helicopter.

## Notices in this docket

- Jun 19, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-15425, comments due Aug 18, 2000 (https://www.federalregister.gov/documents/2000/06/19/00-15425/airworthiness-directives-eurocopter-canada-ltd-model-bo-105-ls-a-3-helicopters)

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