Gas turbine engine having a hydraulic fan brake

A turbine engine having a longitudinal centerline axis, the turbine engine comprising:

• a fan comprising a plurality of fan blades that rotate about the longitudinal centerline axis;
• a rotational component coupled to the fan;
• a fluid circuit for supplying a fluid to the turbine engine;
• and
• a hydraulic fan brake in fluid communication with the fluid circuit to prevent rotation of the rotational component, thus preventing rotation of the fan, the hydraulic fan brake comprising:
• a hydraulic cylinder fluidly coupled to the fluid circuit;
• a gear pump rotationally coupled with the rotational component;
• and
• a valve fluidly coupled to the hydraulic cylinder, the valve being moveable between a first valve position, in which the hydraulic fan brake is in a disengaged configuration that permits rotation of the rotational component, and a second valve position, in which the hydraulic fan brake is in an engaged configuration that prevents rotation of the rotational component via the gear pump.