In modern aircraft, Flight Display Software Application (FDSA) is the core interface between pilots and aircraft systems. As cockpits transition from analog instruments to fully digital “glass” displays, the reliability, accuracy, and performance of these systems have become more critical than ever. Flight displays provide real-time presentation of critical flight, navigation, and engine parameters, playing a vital role in pilot decision-making and ensuring safe aircraft operation.

Because these systems are related to safety, FDSA is usually given Design Assurance Level A or B. They must follow strict rules of DO-178B/C. Any malfunction, incorrect data presentation, or timing failure can lead to serious operational risks. Therefore, rigorous and systematic software verification is needed before the system can be used in real flights.

This white paper explains the testing methods needed for Flight Display Software in aircraft systems. It describes how FDSA works inside Integrated Modular Avionics systems. It also explains how FDSA connects with other systems like Flight Management Systems, Air Data Computers, and Inertial Reference Systems. The paper explains common testing methods, such as requirements-based testing, visual and graphical validation, structural coverage analysis, and hand-code unit testing, Host or Target based testing.