# Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
> **Rule** · Final rule. · Published 2017-06-15 · Effective 2017-07-20 · 82 FR 27411
## Document
- **Document number:** 2017-12074
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney Division Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 82 FR 27411
- **Publication date:** 2017-06-15
- **Effective date:** 2017-07-20
- **FAA docket:** Docket No. FAA-2016-9405
## Abstract

We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Division (PW) PW2037, PW2037M, and PW2040 turbofan engines. This AD was prompted by an unrecoverable engine in-flight shutdown (IFSD) after an ice crystal icing event. This AD requires installing a software standard eligible for installation and precludes the use of electronic engine control (EEC) software standards earlier than SCN 5B/I. We are issuing this AD to correct the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2017/06/15/2017-12074/airworthiness-directives-pratt-and-whitney-division-turbofan-engines)
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