The built-in test (BIT) capability is a feature of which system?

• A. Data Link
• B. RADAR
• C. Mission Computer
• D. ALQ-227

Answer: (C)

Built-in Test is a self-diagnostic capability that lives with the central processing hub of the aircraft’s avionics. The Mission Computer is the core processing unit that handles sensor data, mission data processing, and coordination of the electronic warfare systems. Because the Mission Computer is the central point that interfaces with multiple subsystems and data paths, it runs BIT routines to check its own processors, memory, and communications links, and to report any faults for maintenance. This makes BIT strongly associated with the Mission Computer, since ensuring the health of the core processing and its interfaces is essential to any mission. Other systems like Data Link, RADAR, or the ALQ-227 have diagnostics, but BIT is most fundamentally tied to the Mission Computer as the primary arbiter of avionics health and readiness.