An assembly for correcting the attitude of any selected portion of a structure, the assembly comprising:</claim-text> a controller configured to connect to and control one or more jacks operable to change the attitude of a structure; and a rtional two-axis tilt sensor connected to the controller and configured to be supported on the structure, the tilt sensor being configured to provide analog signals to the controller, which represent the degree of longitudinal pitch and lateral roll of the portion of the structure the sensor is supported on, the controller being additionally configured to move a selected portion of the structure into a desired attitude by commanding movement of the entire structure into an attitude where the tilt sensor signals match a pre-selected reference value corresponding to the desired attitude of the selected portion of the structure, thereby allowing any portion of the structure to be corrected to any desired attitude within a range of attitudes despite the location of the tilt sensor and allowing the tilt sensor to be located anywhere in the structure. view more

An assembly for correcting the attitude of a structure by operating jacks that extend from the structure to contact a support surface before being selectively extended to correct the attitude of the structure, the assembly comprising:</claim-text> a oller configured to connect to and command operation of the jacks; a tilt sensor connected to the controller and configured to be supported on the structure, the tilt sensor being configured to provide signals to the controller representing the attitude of the structure, the controller being additionally configured to receive and use those signals to initially ground the jacks and then to correct the structure to a predetermined attitude relative to gravity; the controller being configured to infer jack ground contact based on tilt angle changes sensed by the tilt sensor. view more