Airports have a need to temporarily install and precision approach path indicator (PAPI) or an abbreviated PAPI (A-PAPI) to provide accurate approach slope guidance when a runway threshold is temporarily displaced due to construction or maintenance projects. Airports have been reluctant to pour concrete foundations for temporary installations because of the cost and impact on operations. However, since the vertical alignment of the PAPI system is critical, a temporary installation method must take into consideration the need temporary installation methods that were effective in maintaining proper aiming angles within the Federal Aviation Administration Advisory Circular 150/5345-28 limitations.


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