# Proposed AD 99-SW-65-AD: Eurocopter Deutschland GMBH Model BO-105CB-5 and BO-105CBS-5 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-26-01
- Action: Supplemental notice of proposed rulemaking; reopening of comment period.
- Published: September 20, 2000, 65 FR 56817
- Comments due: November 20, 2000
- Became: [AD 2000-26-01](https://openairdocs.org/ad/2000-26-01)
- Docket: 99-SW-65-AD
- FR document: 00-24115
- Official PDF: https://openairdocs.org/files/sha256/75/2e/752e0f0db7adbbac870d42f5093eea1db5ca412a3366ee47080421fc37569d2a (from https://www.govinfo.gov/content/pkg/FR-2000-09-20/pdf/00-24115.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/09/20/00-24115/airworthiness-directives-eurocopter-deutschland-gmbh-model-bo-105cb-5-and-bo-105cbs-5-helicopters
- Page: https://openairdocs.org/proposed/99-SW-65-AD

## Summary

This document revises an earlier proposed airworthiness directive (AD) for Eurocopter Deutschland GMBH (ECD) Model BO-105CB-5 and BO-105CBS-5 helicopters that would have superseded an existing AD. The existing AD 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. The proposed AD would have required establishing a life limit for certain main rotor TT straps. That proposal was prompted by a need to establish a life limit for certain TT straps because of an accident in which a main rotor blade (blade) separated from an ECD Model MBB-BK 117 helicopter due to fatigue failure of a TT strap. The same part-numbered TT strap is used on the ECD Model BO-105 helicopters. This new action revises the proposed rule by requiring that you establish a life limit for certain main rotor TT straps before further flight instead of by January 1, 2001, as indicated in the previous proposal. This new action also removes some of the requirements that were previously proposed. The actions specified by this new proposed 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

- Mar 13, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-6037, comments due May 12, 2000 (https://www.federalregister.gov/documents/2000/03/13/00-6037/airworthiness-directives-eurocopter-deutschland-gmbh-model-bo-105cb-5-and-bo-105cbs-5-helicopters)
- Sep 20, 2000: Supplemental notice of proposed rulemaking; reopening of comment period., FR document 00-24115, comments due Nov 20, 2000 (https://www.federalregister.gov/documents/2000/09/20/00-24115/airworthiness-directives-eurocopter-deutschland-gmbh-model-bo-105cb-5-and-bo-105cbs-5-helicopters)

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