Patent ID: 9593628
Date: 2017-03-14
CPC Classifications: B64D,F02C,F02K,F05D,Y02T

Claim:
1. A method of managing a gas turbine engine variable area fan nozzle, comprising the steps of: operating a variable area fan nozzle arranged downstream from a fan that is in a fan nacelle, the variable area fan nozzle operated according to a first operating schedule; evaluating an icing condition input to determine the likelihood of ice presence; altering the first operating schedule, which provides a variable area fan nozzle position, if ice is likely present or actually present to provide an icing operating schedule different than the first operating schedule; wherein the first operating schedule corresponds to the flaps at least partially open at air speeds below 0.55 Mach, and the altering step includes closing the flaps below 0.55 Mach as part of the icing operating schedule; and adjusting the variable area fan nozzle position according to the icing operating schedule, and the adjusting step includes translating flaps to selectively block a vent in the fan nacelle, and the icing condition relates to ice present or likely present in an area of the vent.