# Proposed AD FAA-2011-1045: Honeywell International Inc. Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-17-05
- Products: Honeywell International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 21, 2012, 77 FR 9868
- Comments due: April 23, 2012
- Became: [AD 2012-17-05](https://openairdocs.org/ad/2012-17-05)
- Docket: FAA-2011-1045 (https://www.regulations.gov/docket/FAA-2011-1045, where comments are filed)
- Project: 2011-NE-32-AD
- FR document: 2012-3861
- Official PDF: https://openairdocs.org/files/sha256/d9/ff/d9ff264cfd61dd65b2ed0d6c89c544c568a79893c60f08bbe2ed4c79e5d07ba4 (from https://www.govinfo.gov/content/pkg/FR-2012-02-21/pdf/2012-3861.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/02/21/2012-3861/airworthiness-directives-honeywell-international-inc-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/148301A7E62007B6862579AB00502CF4.0001
- Page: https://openairdocs.org/proposed/FAA-2011-1045

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Honeywell International Inc. models TFE731-4, -4R, -5, -5R, - 5AR, and -5BR series turbofan engines. This proposed AD was prompted by a report of a rim/web separation of a first stage low-pressure turbine (LPT1) rotor assembly. This proposed AD would require replacing affected LPT1 rotor assemblies with LPT1 rotor assemblies eligible for installation. We are proposing this AD to prevent uncontained disk separation, leading to fuel tank penetration, fire, personal injury, and damage to the airplane.

## Notices in this docket

- Feb 21, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-3861, comments due Apr 23, 2012 (https://www.federalregister.gov/documents/2012/02/21/2012-3861/airworthiness-directives-honeywell-international-inc-turbofan-engines)

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