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Wed, Oct 14, 2015

AD: Gulfstream Aerospace Corporation Airplanes

AD NUMBER: 2015-20-10

PRODUCT: All Gulfstream Aerospace Corporation Model GVI airplanes.

ACTION: Final Rule

SUMMARY: 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.

The FAA is 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.

DATES: This AD is effective November 13, 2015.

FMI: AD

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