# Proposed AD 95-ANE-47: CFM International Model CFM56-3C-1 and CFM56-3B-2 Turbofan Engines Installed on Boeing 737-400 Aircraft

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 96-25-11
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 16, 1995, 60 FR 53550
- Comments due: December 15, 1995
- Became: [AD 96-25-11](https://openairdocs.org/ad/96-25-11)
- Docket: 95-ANE-47
- FR document: 95-25568
- Official PDF: https://openairdocs.org/files/sha256/67/42/6742e2aac5c58d3303e2171236b116e3bb749175db02b776fd23bfca790cb654 (from https://www.govinfo.gov/content/pkg/FR-1995-10-16/pdf/95-25568.pdf)
- Federal Register: https://www.federalregister.gov/documents/1995/10/16/95-25568/airworthiness-directives-cfm-international-model-cfm56-3c-1-and-cfm56-3b-2-turbofan-engines
- Page: https://openairdocs.org/proposed/95-ANE-47

## Summary

This notice proposes the supersedure of an existing airworthiness directive (AD), applicable to all CFM International (CFMI) CFM56-3C-1 and certain CFM56-3B-2 engines, that currently requires the removal from service of certain fan disk and fan blade hardware, and limits the use of CFM56-3C-1 thrust levels. This action would require removal of additional fan blade hardware, require an Airplane Flight Manual (AFM) revision to impose thrust level limitations for airplanes equipped with affected engines, and require the installation of redesigned fan blades as a terminating action to the thrust level limitations of this AD. The current AD requirements for certain CFM56-3B-2 engines are unchanged and carried over into the proposed AD. This proposal is prompted by the availability of redesigned fan blades that are not subject to the thrust level limitations, and the need to clarify the AD requirements by deleting references to specific AFM's. The actions specified by the proposed AD are intended to prevent a fan blade failure that can result in complete loss of engine power.

## Notices in this docket

- Oct 16, 1995: Notice of proposed rulemaking (NPRM). (first notice), FR document 95-25568, comments due Dec 15, 1995 (https://www.federalregister.gov/documents/1995/10/16/95-25568/airworthiness-directives-cfm-international-model-cfm56-3c-1-and-cfm56-3b-2-turbofan-engines)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.