What does an ARPA test pattern or fault message indicate?

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ARPA test patterns and fault messages are signals that something in the radar/ARPA system isn’t operating within spec. They come from internal self-tests or fault detection and are meant to alert the operator that maintenance or repair is required before the system can be relied on for safe operation. The test pattern checks the integrity of the radar’s video path, processor, and display, while a fault message flags an actual issue that could degrade tracking performance, range/bearing accuracy, or overall ARPA function. Because this indicates potential unreliability, treat it as a maintenance or fault condition and follow the appropriate procedures before continuing with navigation or plotting.