Maintenance of the measurement mast is a kind of inspection by the Contractor. It takes place from the mast building to the ending of the measurement at three months intervals. It is necessary in order to keep a mast in appropriate technical condition.

Notes about every maintenance are signed in a special "Mast Maintenance Notebook". Every inspection includes especially:

•    pull of wire cable control,
•    plumb maintaining,
•    preservation of a cable fixing near the anchors,
•    visual control of measuring devices.

First inspection will be realized after two months of measurement.