Abstract: A gas turbine engine system includes a gas turbine engine, a bypass duct, and a bypass control valve. The gas turbine engine includes at least a compressor section, a combustion section, and a turbine section. The bypass duct has a bypass duct inlet that is disposed between the compressor section and the combustion section, and a bypass duct outlet that is disposed downstream of the turbine section. The bypass control valve is disposed on the bypass duct and is moveable to a commanded valve position, which is one of a closed position, in which compressed air from the compressor section does not flow through the bypass duct, and a plurality of open positions, in which compressed air discharged from the compressor section flows through the bypass duct and mixes with exhaust gas discharged from the turbine section to form the discharge gas that is supplied to the main chamber.

Abstract: A system and method for controlling bleed air flow into an air cycle machine that includes a bleed air inlet and a conditioned air outlet is provided. The system and method include discharging bleed air from an operating gas turbine engine, sensing exhaust gas temperature (EGT) of the gas turbine engine, sensing conditioned air temperature at the conditioned air outlet, and controlling bleed air flow into the air cycle machine based on the sensed EGT and on the sensed conditioned air temperature.

Abstract: In one embodiment, an ultrasound probe is provided including a probe body with a sensing face arranged to be held in contact with a subject by a user. The probe also provides a tactile interface located on a side of the probe body sufficiently close to the sensing face so that a user can depress the tactile interface with a finger while the probe is grasped by the user via the thumb of the same hand and at least two other fingers of the same hand rest in contact with the subject. The probe includes at least one switch which is activated by depression of the tactile interface.