# Proposed AD 2001-SW-13-AD: Bell Helicopter Textron, Inc. Model 47B, 47B-3, 47D, 47D-1, 47G, 47G-2, 47G2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A, 47H-1, 47J, 47J-2, 47J-2A, and 47K Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-17-17
- Action: Notice of proposed rulemaking.
- Published: March 29, 2001, 66 FR 17105
- Comments due: May 29, 2001
- Became: [AD 2001-17-17](https://openairdocs.org/ad/2001-17-17)
- Docket: 2001-SW-13-AD
- FR document: 01-7741
- Official PDF: https://openairdocs.org/files/sha256/10/fa/10fa796c5e11b729ca04a7290fae58ab9954716add7ae6a32b5c60af5e46290c (from https://www.govinfo.gov/content/pkg/FR-2001-03-29/pdf/01-7741.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/03/29/01-7741/airworthiness-directives-bell-helicopter-textron-inc-model-47b-47b-3-47d-47d-1-47g-47g-2-47g2a
- Page: https://openairdocs.org/proposed/2001-SW-13-AD

## Summary

This document proposes superseding an existing airworthiness directive (AD) for Bell Helicopter Textron, Inc. (BHTI) Model 47B, 47B- 3, 47D, 47D-1, 47G, 47G-2, 47G2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A, 47H-1, 47J, 47J-2, 47J-2A, and 47K helicopters. That AD currently requires either recurring liquid penetrant or eddy current inspections of the main rotor blade grip (grip) threads for a crack. If a crack is detected, that AD requires, before further flight, replacing the cracked grip with an airworthy grip. That AD also establishes a retirement life of 1200 hours time-in-service (TIS) for each grip. This AD contains the same requirements but adds two part numbers (P/N) to the applicability and requires only recurring eddy current inspections of the grip threads. This AD also requires reporting any results of the grip inspections to the FAA Rotorcraft Certification Office. This proposal is prompted by the results of an accident investigation, an operator survey conducted by a trade association, various comments concerning the current AD, and a further analysis of field service data. The actions specified by this AD are intended to prevent failure of a grip, loss of a main rotor blade, and subsequent loss of control of the helicopter.

## Notices in this docket

- Mar 29, 2001: Notice of proposed rulemaking. (first notice), FR document 01-7741, comments due May 29, 2001 (https://www.federalregister.gov/documents/2001/03/29/01-7741/airworthiness-directives-bell-helicopter-textron-inc-model-47b-47b-3-47d-47d-1-47g-47g-2-47g2a)

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