Refers to any action that makes the devices, and the operation of the crane is in a condition that is usually available. With the process of testing, measurement, adjustment, and repair up to date.
Means any action that makes the device and operation of the crane in a state that is normally available with a step in the test, measurement, improvement and repair it.
Means any operation that equipment and the work of the crane in the condition that are normally available procedures in test, measurement, improvement and repair.