Aerospace Instrument-Making Annotation << Back Analysis of the impact aircraft’s velocity and angle of attack on the temperature gradient which occurs behind a damage of an airplane’s wing external contour Babenko А.Е. The influence of aircraft's speed and angle of attack on the temperature gradient for rec-tangular damage of the wing external contour for airplane An-148 based on simulation using the software package SolidWorks Flow Simulation has been investigated in the arti-cle. The change of the flow pattern along external contour with occurred damage has been analyzed. The mathematical models of two-dimensional and three-dimensional flows of air have been analyzed. It has been established that with the temperature difference along the aircraft external contour shows a tendency to increase increasing speed of 40 m/s to 240 m/s. The highest temperature difference for the control lines was obtained 0,85…36 K to the line at a distance from the leading edge by 1/3 chord along the lower surface of the external contour. Temperature difference along the control lines ranges 1,5…6 K for angles of attack changes from –20° to 20° has been detected. A significant increase the spreading area of the temperature gradient was detected for angles of attack less than –15 ° – along the upper surface of the external contour, and for angles of attack over 15° – along the bottom surface. The choice of transducers for opportunities to diag-nose external contour of an airplane in flight. Shown that the most appropriate to apply thermocouple T-type with accuracy class 1 (± 0,5 K). The temperature Reynolds number which connects the temperature difference between the undisturbed air flow to the tem-perature difference between the damaged and undamaged areas of the aircraft’s external contour in flight, and altitude with the magnitude of damage to the wing chord has been obtained. For the angle of attack dependence was determined which connects the lift force changes to the wing area changes as a result of damage and the temperature difference between damaged and undamaged areas of the external contour. Key words: temperature gradient, external contour, boundary layer, damage, aircraft's speed, the aircraft's angle of attack, thermal method. Contacts: E-mail: andrii.babenko@gmail.com Pp. 29-43.