Patent ID: 7634984

Claim:
An air induction system for a helicopter engine to receive intake air, remove contaminants from the intake air, and provide the intake air for delivery to the engine, the system comprising: a housing mounted on the helicopter having a hollow interior with at least one entryway for receiving intake air into the housing, a contaminant separator for removing contaminants from the air, and an exit for discharge of air from the housing; a duct positioned adjacent the exit of the housing to receive intake air therefrom for delivering the air to said engine, the duct having an inside defining an internal flow path for intake air and an outside; and a seal positioned between the housing and the duct for preventing passage of air therethrough; wherein the seal is attached to both the housing and the duct; wherein the seal is disposed between the outside of the duct and the housing such that the seal is not exposed to air flowing in the internal flow path of the duct; wherein the housing includes a nacelle and a frame at a back end of the nacelle, the frame having an opening therein comprising the exit, and wherein a front of the duct is received through the opening; wherein the seal extends between the outside of the duct and the opening in the frame; wherein the frame has a flange extending around the opening, the seal being clamped against the flange.