Treatment for gap and step nonconformity of slat on tail-hang civil aircraft

Abstract Slat aerodynamic contour nonconformity often occurs during the manufacture of civil aircraft, which can cause appearance influence, drag increase and even manoeuvrability & stability problem. This article introduces 4 types of gaps and 3 types of step nonconformity and reason for them. Then the article studies treatment principle for wing slat contour nonconformity. In the end, the article figures out acceptable criteria and 5 types of standard repair methods for slat gap and step nonconformity.