# Airworthiness Directives; Pratt & Whitney Division (PW) Turbofan Engines
> **Rule** · Final rule. · Published 2019-02-15 · Effective 2019-03-22 · 84 FR 4320
## Document
- **Document number:** 2019-02453
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney Division (PW) Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 84 FR 4320
- **Publication date:** 2019-02-15
- **Effective date:** 2019-03-22
- **FAA docket:** Docket No. FAA-2018-0826
## Abstract

We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Division (PW) PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines. This AD was prompted by an in-flight failure of a 1st-stage low-pressure compressor (LPC) blade. This AD requires initial and repetitive thermal acoustic imaging (TAI) inspections for cracks in certain 1st-stage LPC blades and removal of those blades that fail inspection. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/02/15/2019-02453/airworthiness-directives-pratt-and-whitney-division-pw-turbofan-engines)
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