In this paper we are interested in Moufang-Klingenberg planesM(A) defined over a local alternative ring A of dual numbers. We show that some collineations of M(A) preserve cross-ratio., {"references":["A. Akpinar, B. Celik and S. Ciftci, Cross-ratios and 6-figures in some\nMoufang-Klingenberg planes. Bulletin of the Belgian Math. Soc.-Simon\nStevin 15(2008), 49-64.","C.A. Baker, N.D. Lane and J.W. Lorimer. A coordinatization for\nMoufang-Klingenberg planes. Simon Stevin 65(1991), 3-22.","J.L. Bell. The art of the intelligible: An elementary survey of mathematics\nin its conceptual development. Kluwer Acad. Publishers, The\nNetherland, 2001.","A. Blunck. Cross-ratios in Moufang planes. J. Geometry 40(1991), 20-\n25.","A. Blunck. Projectivities in Moufang-Klingenberg planes. Geom. Dedicata\n40(1991), 341-359.","A. Blunck. Cross-ratios over local alternative rings. Res. Math. 19\n(1991), 246-256.","A. Blunck. Cross-ratios in Moufang-Klingenberg planes. Geom. Dedicata\n43(1992), 93-107.","B. Celik, A. Akpinar and S. Ciftci. 4-Transitivity and 6-figures in some\nMoufang-Klingenberg planes. Monatshefte f¨ur Mathematik 152(2007),\n283-294.","S. Ciftci and B. Celik. On the cross-ratios of points and lines in Moufang\nplanes. J. Geometry 71(2001), 34-41.\n[10] J.C. Ferrar. Cross-ratios in projective and affine planes. in Plaumann, P.\nand Strambach, K., Geometry - von Staudt-s Point of View (Proceedings\nBad Windsheim, 1980), Reidel, Dordrecht, (1981) 101-125.\n[11] D.R. Hughes and F.C. Piper. Projective planes. Springer, New York,\n1973.\n[12] G. Pickert. Projektive Ebenen. Springer, Berlin, 1955.\n[13] R.D. Schafer. An introduction to nonassociative algebras. Dover Publications,\nNew York, 1995.\n[14] F.W. Stevenson. Projective planes. W.H. Freeman Co., San Francisco,\n1972."]}