# Airworthiness Directives; Pratt & Whitney Division Turbofan
> **Rule** · Final rule. · Published 2018-08-24 · Effective 2018-09-28 · 83 FR 42771
## Document
- **Document number:** 2018-18373
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 83 FR 42771
- **Publication date:** 2018-08-24
- **Effective date:** 2018-09-28
- **FAA docket:** Docket No. FAA-2017-1107
## Abstract

We are superseding Airworthiness Directive (AD) 2017-12-03 for certain Pratt & Whitney Division (PW) PW2037, PW2037M, and PW2040 turbofan engines. AD 2017-12-03 required installing a software standard eligible for installation and precludes the use of electronic engine control (EEC) software standards earlier than SCN 5B/I. This AD requires installing a software standard eligible for installation and preclude the use of EEC software standards earlier than SCN 5B/I or SCN 27A. This AD was prompted by an unrecoverable engine in-flight shutdown (IFSD) after an ice crystal icing event. We are issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/08/24/2018-18373/airworthiness-directives-pratt-and-whitney-division-turbofan)
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