Back Figure 1-23. Electric Winterization System Diagram and Electric Heater Control Schematic Diagram Instruction Plate | Up TM-5-6115-545-12 Power Unit Utility Pack Gas Turbine Engine Driven (Air Research Model PPU85-5) Non-Winterized and (Air Research Model PPU85-4) Winterized Manual | Next oiTable 1-1. Differences in Performance Characteristics |