# Airworthiness Directives; Honeywell International Inc. Turbofan Engines
> **Rule** · Final rule. · Published 2012-08-28 · Effective 2012-10-02 · 77 FR 51892
## Document
- **Document number:** 2012-21010
- **Category:** airworthiness
- **Manufacturer:** Honeywell International Inc. Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 51892
- **Publication date:** 2012-08-28
- **Effective date:** 2012-10-02
- **FAA docket:** Docket No. FAA-2011-1045
## Abstract

We are adopting a new airworthiness directive (AD) for certain Honeywell International Inc. models TFE731-4, -4R, -5, -5R, -5AR, and - 5BR series turbofan engines. This AD was prompted by a report of a rim/ web separation of a first stage low-pressure turbine (LPT1) rotor assembly. This AD requires replacing affected LPT1 rotor assemblies with assemblies eligible for installation. We are issuing this AD to prevent uncontained disk separation, engine failure, and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/08/28/2012-21010/airworthiness-directives-honeywell-international-inc-turbofan-engines)
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