The air bridge that connects an airplane with air terminal is important facilities that help people get in and out an airplane safely and conveniently. As the number of people who takes airplane has been increasing, an unexpected accident or a disorder on an air bridge can lead to the loss of passenger's lives or a great damage of airplane. This paper suggests a method to secure the safety of an air bridge.

The field application of air-coupled impact echo (IE) is evaluated in this study, where an actual in-service concrete bridge deck is tested. An IE test equipment set is deployed as part of an effort to develop new rapid measurement method. The IE data are presented as two-dimensional frequency maps. For verification of the location of shallow delamination damage, eight drilled core samples were extracted from the test area. The results show reasonably good agreement with the drilled cores.