Design and Verification of High-integrity Airborne Display Unit of Display and Crew Alerting System in Civil Aircraft

To satisfy the safety objective of the critical flight parameter display function, we propose a high-integrity airborne display unit design. Firstly, the image drawing module performs the first-drawing in the display function path; secondly, the display application module reads back the first-drawing image and inserts monitor factors into the invisible area to perform second-drawing; at last, the integrity monitor module decodes monitor factors and compares with reference data. The test is performed and reflects that this high-integrity design can adapt to multiple airborne display unit types with various flight parameter graphic size, appearance, and motion, covering the complete display function path.