# Proposed AD FAA-2015-0677: Gulfstream Aerospace Corporation Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-20-10
- Products: Gulfstream Aerospace
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 31, 2015, 80 FR 17005
- Comments due: May 15, 2015
- Became: [AD 2015-20-10](https://openairdocs.org/ad/2015-20-10)
- Docket: FAA-2015-0677 (https://www.regulations.gov/docket/FAA-2015-0677, where comments are filed)
- Project: 2013-NM-244-AD
- FR document: 2015-07301
- Official PDF: https://openairdocs.org/files/sha256/62/fa/62fa612432b33eeb216b60a08e1725a176b6a752b4a1bb385875da8a83ce3e62 (from https://www.govinfo.gov/content/pkg/FR-2015-03-31/pdf/2015-07301.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/03/31/2015-07301/airworthiness-directives-gulfstream-aerospace-corporation-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CF110405A0B51D1786257E19004CC143.0001
- Page: https://openairdocs.org/proposed/FAA-2015-0677

## Summary

We propose to adopt a new airworthiness directive (AD) for all Gulfstream Aerospace Corporation Model GVI airplanes. This proposed AD was prompted by reports of corrosion on in-service air non-return valves. This proposed AD would require a revision to the Emergency Procedures section of the airplane flight manual (AFM). This proposed AD would also require 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 proposing 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.

## Notices in this docket

- Mar 31, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-07301, comments due May 15, 2015 (https://www.federalregister.gov/documents/2015/03/31/2015-07301/airworthiness-directives-gulfstream-aerospace-corporation-airplanes)

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