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As a human-machine interactive equipment of airplane, the airborne display and control equipment has the characteristics of date processing and man-machine interaction. Fault detection rate of this equipment cannot meet user demands by using the old testability methods of BIT (Built-in Test). Depending on the composition and main functions of the equipment and the FMECA (failure mode and effects and criticality analysis) results, the method of testability design by combining with BIT and manual detection is proposed. According to the TADS software, the testability model of the equipment is calculated and analyzed to show that the fault detection rate is effectively improved from 74.72% to 93.26%, which meets the user’s demands at a low cost. The method has good engineering practical value, which may be helpful for the other man-machine equipment of airplane.