# Proposed AD 99-SW-66-AD: Eurocopter Deutschland GMBH Model BO-105A, BO-105C, BO-105 C-2, BO-105 CB-2, BO-105 CB-4, BO-105S, BO-105 CS-2, BO-105 CBS-2, BO-105 CBS-4, and BO-105LS A-1 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-17-08
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 24, 2000, 65 FR 21673
- Comments due: June 23, 2000
- Became: [AD 2000-17-08](https://openairdocs.org/ad/2000-17-08)
- Docket: 99-SW-66-AD
- FR document: 00-10086
- Official PDF: https://openairdocs.org/files/sha256/ed/d3/edd362188968a0221641ee3139b6e75a54b1fc9e168fc15843e5b48967ccd7f9 (from https://www.govinfo.gov/content/pkg/FR-2000-04-24/pdf/00-10086.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/04/24/00-10086/airworthiness-directives-eurocopter-deutschland-gmbh-model-bo-105a-bo-105c-bo-105-c-2-bo-105-cb-2
- Page: https://openairdocs.org/proposed/99-SW-66-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD) for Eurocopter Deutschland GMBH (ECD) Model BO-105A, BO-105C, BO-105 C-2, BO-105 CB-2, BO-105 CB-4, BO-105S, BO-105 CS-2, BO-105 CBS-2, BO-105 CBS-4, and BO-105LS A-1 helicopters. That AD currently requires creating a component log card or equivalent record and determining the calendar age and number of flights on each tension-torsion (TT) strap. That AD also requires 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 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. The actions specified by this AD are intended to prevent fatigue failure of the TT strap, loss of a blade, and subsequent loss of control of the helicopter.

## Notices in this docket

- Apr 24, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-10086, comments due Jun 23, 2000 (https://www.federalregister.gov/documents/2000/04/24/00-10086/airworthiness-directives-eurocopter-deutschland-gmbh-model-bo-105a-bo-105c-bo-105-c-2-bo-105-cb-2)

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