Machine not available due to a software failure; procedure must be redone or rescheduled. (e.g., software lock-up, crash or software defect reducing functionality).System (including transducers, tracker, pole) is not available due to an abuse (e.g., overly aggressive cleaning of applied parts) or damage (device is broken /damaged due to mechanical impacts, drops, etc.).User manual provides instruction to inspect the device before use.Transducers meet environmental, safety and reliability requirements.