# Proposed AD 2001-NE-49-AD: CFM International CFM56-5 and -5B Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-02-04
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 16, 2006, 71 FR 34852
- Comments due: August 15, 2006
- Became: [AD 2003-02-04](https://openairdocs.org/ad/2003-02-04)
- Docket: 2001-NE-49-AD
- FR document: E6-9446
- Official PDF: https://openairdocs.org/files/sha256/d6/68/d66837aab9c40725e956678591f0c915e1f7b6d83fa4e78e02d6d028d757fc55 (from https://www.govinfo.gov/content/pkg/FR-2006-06-16/pdf/E6-9446.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/06/16/E6-9446/airworthiness-directives-cfm-international-cfm56-5-and--5b-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9AA97AC827FDFB628625718F005957E2.0001
- Page: https://openairdocs.org/proposed/2001-NE-49-AD

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) for CFM International CFM56-5 and -5B series turbofan engines. That AD currently requires exhaust gas temperature (EGT) harness replacement or the establishment of an EGT baseline and trend monitoring. That AD also requires replacement, if necessary, of certain EGT harnesses and EGT couplings as soon as a slow and continuous EGT drift downward is noticed after the effective date of that AD. This proposed AD would require the same actions but for an increased population of affected EGT harnesses. This proposed AD results from CFM International adding subsequently certified engine models to the list of engines that could have affected harnesses installed. We are proposing this AD to prevent unexpected deterioration of critical rotating engine parts due to higher than desired engine operating EGTs.

## Notices in this docket

- Jun 13, 2002: Notice of proposed rulemaking (NPRM). (first notice), FR document 02-14856, comments due Aug 12, 2002 (https://www.federalregister.gov/documents/2002/06/13/02-14856/airworthiness-directives-cfm-international-cfm56-5--5a-and--5b-series-turbofan-engines)
- Jun 16, 2006: Notice of proposed rulemaking (NPRM)., FR document E6-9446, comments due Aug 15, 2006 (https://www.federalregister.gov/documents/2006/06/16/E6-9446/airworthiness-directives-cfm-international-cfm56-5-and--5b-series-turbofan-engines)

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