What is the designation of a repair that is required to be flush with the runway?

The designation of a repair that is required to be flush with the runway is "flush." This term indicates that the surface of the repair must be even with the surrounding area, ensuring that there are no bumps or depressions. This is crucial in aviation because a flush repair helps maintain the integrity of the runway surface, preventing potential hazards for aircraft during takeoff, landing, and taxiing. A flush surface allows for smooth transitions between different sections of the runway, which is vital for both safety and operational efficiency.

Other terms like "flat," "even," and "level" may imply a similar concept but do not specifically denote the requirement of being in alignment with the surface of the runway. Being flush emphasizes the importance of seamless integration with the existing runway surface, distinguishing it from other types of repairs that may not require such precision.