# Proposed AD 99-SW-67-AD: Eurocopter Deutschland GMBH Model MBB-BK 117 Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-26-06
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 18, 2000, 65 FR 56275
- Comments due: November 17, 2000
- Became: [AD 2000-26-06](https://openairdocs.org/ad/2000-26-06)
- Docket: 99-SW-67-AD
- FR document: 00-23861
- Official PDF: https://openairdocs.org/files/sha256/d7/45/d745bae713e76558c289e74431f1854d6fd0046f70c3da227c765caea2339b79 (from https://www.govinfo.gov/content/pkg/FR-2000-09-18/pdf/00-23861.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/09/18/00-23861/airworthiness-directives-eurocopter-deutschland-gmbh-model-mbb-bk-117-helicopters
- Page: https://openairdocs.org/proposed/99-SW-67-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD) for Eurocopter Deutschland GMBH (ECD) Model MBB-BK 117 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. 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 an ECD Model MBB-BK 117 helicopter due to fatigue failure of a TT strap. 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

- Sep 18, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-23861, comments due Nov 17, 2000 (https://www.federalregister.gov/documents/2000/09/18/00-23861/airworthiness-directives-eurocopter-deutschland-gmbh-model-mbb-bk-117-helicopters)

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