Abstract: An apparatus for measuring a blade tip clearance for a gas turbine engine may include a frame having an attachment system, an arm associated with the frame, and a measurement sensor associated with the arm.

Abstract: A method for measuring blade tip clearance for a gas turbine engine having a fan case assembly and a rotor having a plurality of blades may include the steps of removably attaching a measurement tool to the fan case assembly, the measurement tool having a sensor, rotating the rotor, and measuring blade tip clearance for the plurality of blades during the rotation of the rotor.

Abstract: An object sensor system is mounted on a garage door controlled by an electric garage door opener. The sensor system senses objects directly in the travel path of the door's leading edge. Each object sensor of the system comprises a mounting plate for permanent attachment to the garage door near a leading edge of the door, an upper hinge plate hingeably connected to the mounting plate, a lower hinge plate hingeably connected to the mounting plate and a connecting hinge plate connected to the upper and lower hinge plates. The plates are connected to move in concert. Each of the object sensors also includes a bracket having a first leg attached to the connecting hinge plate and a second leg extending horizontally towards the mounting plate and under the leading edge of the door. An electronic sensor is mounted on the bracket's second leg at a distal end to transmit or receive a light beam.