Once substantial changes have been made, these require an acceptance test.

This test is identical to the test before initial commissioning. See Test before initial commissioning.

The test is only necessary on the parts of the crane that have undergone substantial change.

Examples of substantial changes are:

─     Changing the power supply

─     Replacement of trolleys

─     Converting or modifying the travel drive or hoist drive

─     Increasing the maximum load capacity of a crane installation

─     Extension of a crane track

─     Using cranes on different crane tracks

─     Welding on load-bearing structural elements

─     Design modifications to a supporting structure

─     Conversion of components of the supporting structure. This includes the crane track, the mountings, the building beams, the building supports, the concrete girders and the concrete supports.

─     Change of the operating conditions of the crane installation in relation to the classification according to FEM.

─     Conversion to a different type of control (e.g. radio remote control).

─     Changing the mode of operation in regard to the operating time class and the load spectrum (e.g. switching from single-shift operation to multiple-shift operation).