# Airworthiness Directives; General Electric Company Turbofan Engines
> **Rule** · Final rule. · Published 2012-01-31 · Effective 2012-03-06 · 77 FR 4650
## Document
- **Document number:** 2012-1953
- **Category:** airworthiness
- **Manufacturer:** General Electric Company Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 77 FR 4650
- **Publication date:** 2012-01-31
- **Effective date:** 2012-03-06
- **FAA docket:** Docket No. FAA-2010-0068
## Abstract

We are superseding two existing airworthiness directives (ADs) for General Electric Company (GE) CF6-45 and CF6-50 series turbofan engines with certain low-pressure turbine (LPT) rotor stage 3 disks installed. The existing ADs currently require inspections of high- pressure turbine (HPT) and LPT rotors, engine checks, and vibration surveys. This new AD retains the requirements of the two ADs being superseded, adds an optional LPT rotor stage 3 disk removal after a failed HPT blade borescope inspection (BSI) or a failed engine core vibration survey, establishes a new lower life limit for the affected LPT rotor stage 3 disks, and requires removing these disks from service at times determined by a drawdown plan. This AD was prompted by the determination that a new lower life limit for the LPT rotor stage 3 disks is necessary. We are issuing this AD to prevent critical life- limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/01/31/2012-1953/airworthiness-directives-general-electric-company-turbofan-engines)
---
*AI Analytics · CC0 1.0*