An initial experimental investigation of boundary layer flame interaction has been carried out . Homogeneous propane-air gas mixtures with laminar free stream flow were studied. The flames were essentially two-d imensional and intersected a boundary layer flowing over a flat plate or airfoil shaped plate. Two distinct types of flame stabilization were found, depending upon the nature of the boundary layer. Experimental nonsteady phenomena of blowoff, flashback, and boundary layer flame oscillation are reported and discussed.