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During the commercial aircraft assembly process, many interrelated installations require alignment to a common reference centerline or location to a common reference plane. A rotational laser can be used to establish a vertical, horizontal, or other desired plane orientation to serve as a common installation reference for multiple assemblies. The cargo floor installation in the lower lobe of the 777 forward section requires that three physically separate cargo floor sections be aligned to a common centerline and lie in the same horizontal plane. Two rotational lasers are used in conjunction with laser positioning equipment, digital laser targets, and conventional tooling hardware to meet the installation criteria and provide a reliable, repeatable process.