What is required on all ATRS hydraulic jacks to prevent support failure?

The requirement for check valves on all ATRS hydraulic jacks is vital to preventing support failure because these devices are designed to hold the hydraulic fluid in the cylinder and maintain the pressure when the jack is not actively being raised or lowered. Check valves ensure that if there is a sudden loss of pressure or a failure in the hydraulic system, the fluid does not leak out, which could result in the jack collapsing and endangering the safety of personnel and equipment. This mechanism provides an essential safety feature, ensuring that the support remains stable and reduces the risk of accidents associated with hydraulic failure.

The other options, while they may also contribute to operational safety in various contexts, do not specifically address the prevention of support failure in the same critical way. Safety locks are important for mechanisms that require physical restraint, hydraulic pressure indicators can help monitor system performance, and weight sensors can alert to overload conditions, but none fulfill the same function as check valves in maintaining support integrity under pressure loss conditions.