# Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes
> **Rule** · Final rule. · Published 2015-10-09 · Effective 2015-11-13 · 80 FR 61088
## Document
- **Document number:** 2015-25495
- **Category:** airworthiness
- **Manufacturer:** Gulfstream Aerospace Corporation
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 80 FR 61088
- **Publication date:** 2015-10-09
- **Effective date:** 2015-11-13
- **FAA docket:** Docket No. FAA-2015-0677
## Abstract

We are adopting a new airworthiness directive (AD) for all Gulfstream Aerospace Corporation Model GVI airplanes. This AD was prompted by reports of corrosion on in-service air non-return valves. This AD requires a revision to the Emergency Procedures section of the airplane flight manual (AFM). This AD also requires a revision to the maintenance or inspection program, as applicable, to incorporate airworthiness limitations for the high pressure (HP) Stage 5 air non- return valves. We are issuing this AD to ensure the flightcrew is provided with procedures to mitigate the risks associated with failure of the HP Stage 5 air non-return valve. Failure of the HP Stage 5 air non-return valve in the open position could result in engine instability and uncommanded in-flight shutdown.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/10/09/2015-25495/airworthiness-directives-gulfstream-aerospace-corporation-airplanes)
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