Hydraulic system testing is a complex activity made easy with the AERO Specialties family of Hydraulic Power Units. Simplify your aircraft hydraulic system testing with the innovative, fast, safe, quiet, and convenient family of HPUs. The large, easy to read display includes dedicated pushbutton controls for flow and pressure adjustments to allow the operator to focus on the aircraft test procedures instead of the HPU. Standard data-logging with downloadable Excel files document accurate test results and aid record keeping. Gone are the days of manual adjustments for flow and pressure – thanks to the digital control system, the HPU automatically regulates pressure during flow rate changes. The AERO Specialties HPU eliminates the risk of over-pressure events which can cause aircraft damage or injuries to personnel. Built for tough environments with a full stainless-steel enclosure covering a galvanized frame, and full-enclosure drip tray. Maintenance is simple thanks to tool-less access panels, fully marked components, wires and hoses and consumable parts lists available through the digital display. The HPU 4 is designed for narrow and wide-body commercial and larger military transport/tanker aircraft.