# Proposed AD FAA-2012-1114: CFM International, S.A. Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-14-06
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 14, 2013, 78 FR 2644
- Comments due: March 15, 2013
- Became: [AD 2013-14-06](https://openairdocs.org/ad/2013-14-06)
- Docket: FAA-2012-1114 (https://www.regulations.gov/docket/FAA-2012-1114, where comments are filed)
- Project: 2012-NE-21-AD
- FR document: 2013-00529
- Official PDF: https://openairdocs.org/files/sha256/f6/cc/f6cce9f228f67f0ec1486c5dccec875b27578a8a6c1e252266744745c5d8cdae (from https://www.govinfo.gov/content/pkg/FR-2013-01-14/pdf/2013-00529.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/01/14/2013-00529/airworthiness-directives-cfm-international-sa-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1427504CE9AF454A86257AF30051D4E1.0001
- Page: https://openairdocs.org/proposed/FAA-2012-1114

## Summary

We propose to adopt a new airworthiness directive (AD) for certain CFM International, S. A. (CFM) model CFM56-5 and CFM56-5B series turbofan engines. This proposed AD was prompted by corrosion of the delta P valve in the hydromechanical unit (HMU) caused by contaminants in type TS-1 fuel. This proposed AD would require cleaning, inspection and repair of affected HMUs. We are proposing this AD to prevent seizure of the HMU, leading to failure of one or more engines and damage to the airplane.

## Notices in this docket

- Jan 14, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-00529, comments due Mar 15, 2013 (https://www.federalregister.gov/documents/2013/01/14/2013-00529/airworthiness-directives-cfm-international-sa-turbofan-engines)

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