# Proposed AD 94-SW-19-AD: Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 Series Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 95-21-12
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 13, 1995, 60 FR 8205
- Comments due: April 14, 1995
- Became: [AD 95-21-12](https://openairdocs.org/ad/95-21-12)
- Docket: 94-SW-19-AD
- FR document: 95-3514
- Official PDF: https://openairdocs.org/files/sha256/41/31/413121ed94580ed1c20f5b5b19379cbf0dc08b00df86e9b1c2fb2582e96d5f2b (from https://www.govinfo.gov/content/pkg/FR-1995-02-13/pdf/95-3514.pdf)
- Federal Register: https://www.federalregister.gov/documents/1995/02/13/95-3514/airworthiness-directives-eurocopter-deutschland-gmbh-ecd-model-mbb-bk-117-series-helicopters
- Page: https://openairdocs.org/proposed/94-SW-19-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 series helicopters. This proposal would require initial and repetitive inspections of the main rotor (M/R) blade upper and lower surface for bulging. This proposal is prompted by two reported incidents in which a balance weight became detached from inside the M/R blade structure and migrated toward the tip of the M/R blade. The actions specified by the proposed AD are intended to detect movement of a balance weight to prevent severe vibrations and a subsequent precautionary landing.

## Notices in this docket

- Feb 13, 1995: Notice of proposed rulemaking (NPRM). (first notice), FR document 95-3514, comments due Apr 14, 1995 (https://www.federalregister.gov/documents/1995/02/13/95-3514/airworthiness-directives-eurocopter-deutschland-gmbh-ecd-model-mbb-bk-117-series-helicopters)

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