SR Technics Switzerland invited bids, stipulating that the performance characteristics of the existing technology must be met. Instead of supplying new cranes, the STAHL CraneSystems' engineers in Switzerland developed an economic concept planning reequipping all movable parts and the crane electrics directly on site. The challenge should not be underestimated of manufacturing over 400 mechanical components individually and fitting them on site on schedule. The dimensional tolerances for temperature fluctuations due to the weather also had to be taken into account. By means of this detailed concept, STAHL CraneSystems AG was able to present the most convincing package among the competitors.
The crucial factors for the customer's decision were quality and reliable scheduling of the order as the cranes had to remain available continuously.

In this respect confidence in the technology and competent handling of orders of the original manufacturer was decisive. A modification time of a maximum of three weeks was scheduled for each crane installation. During this time the electrics were renewed, the hoists and drive motors replaced and the complete wheelsets of the crane endcarriages substituted. Modern frequency
inverters were planned for the long and cross travel motions so that up-to-date stepless speeds are now at the customer’s disposal. The power supply systems along the 130 m crane runways were replaced by new compact conductor lines type KSL. Operating the cranes was modified to radio remote controls replacing the old control pendants suspended on cables. Radio remote controls type FST 514 were used, the transmitters being explosion-protected as in an aircraft hangar the atmosphere may be expected to
contain kerosene. An unusual feature are the hoists. STAHL CraneSystems series hoists type AS70 have now been fitted in place of the old winches. The desired
fast hoisting speed of 12.5 m/min was achieved as was the requirement of true vertical lift: two ropes lead off the drum, their speed not being reduced by reeving. The safety of the crane systems is of crucial importance for SR Technics Switzerland.
The integrated LAS load measurement system registers the load torque directly in the hoist gear. If an overload should be detected, the hoisting motion is disconnected by the SMC1 Multicontroller. This system provides a decisive extra safety feature as the electronic device records all operating conditions from the number of motor switching operations up to overload situations.
In addition, it monitors the hoist motor temperature. On the basis of the electronic records, the arithmetical residual lifetime of the hoist can be calculated precisely – an important element for the maintenance concept of the modified cranes.