# Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
> **Rule** · Final rule. · Published 2013-08-13 · Effective 2013-09-17 · 78 FR 49111
## Document
- **Document number:** 2013-19429
- **Category:** airworthiness
- **Manufacturer:** Pratt & Whitney Division Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 78 FR 49111
- **Publication date:** 2013-08-13
- **Effective date:** 2013-09-17
- **FAA docket:** Docket No. FAA-2013-0072
## Abstract

We are adopting a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) turbofan engine model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 with a certain second- stage high-pressure turbine (HPT) air seal part number installed. This AD was prompted by discovery of cracks in second-stage HPT air seals. This AD requires inspection and removal from service of HPT air seals that fail inspection. We are issuing this AD to prevent failure of the second-stage HPT air seal, which could lead to an uncontained engine failure and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/08/13/2013-19429/airworthiness-directives-pratt-and-whitney-division-turbofan-engines)
---
*AI Analytics · CC0 1.0*