The design watches carefully for compensation of temperature influences, which can be caused by water. One attendee asked if the system could be used for coated tubes as well, and give an additional result of the coating thickness. In principle this has been already tried successfully for plastic gasoline tubes. However, there were doubts about whether the system software would need a lot of changes. This is also true of the NASA Space Shuttle.
Conventional techniques have the problem of human error.
Hopefully, today with computers we can find ways of minimizing this. However there are limitations of stationary portable c-scan bridges. MACS employs ultrasonic motors for mobility and suction for surface adherence. Autonomous crawler - The future of portable rapid scanners . Such devices can be operated during an aircraft's idle time reducing the need to ground aircraft for inspection.