"The present report is part of a 'Manual' on aircraft loads, that is being prepared by NLR. It contains a computer program, to be used in combination with "MATLAB4 for Windows" (Student Edition) software, to study aircraft loading due to turbulence. It includes a simple aircraft response model with two rigid and three flexible symmetric degrees of freedom and allows calculation of various structural responses due to discrete (1-cos) gusts as well as continuous turbulence. The program is intended as a 'tool' which will also be extensively used in a next report to be prepared, dealing with gust loads and requirements."