These units are both designed and in use on Boeing and Airbus wide-body aircraft, in addition to the B757. The line of aircraft maintenance and engine access stands facilitate safe access to nacelles on Pratt & Whitney (PW), GE Aviation (GE) and Rolls-Royce (RR) engines, providing a safe working solution to many of the traditionally difficult under-cowling maintenance locations. The hydraulic pitch and height adjustment allows for the diverse angles and height variables frequently required when maintaining aircraft.