HONEYWELL Air Cooling Device

Complex, Custom Built, Made by Hand
Built to Withstand Extreme Environment
ACE Used 3D Printing Technology to Analyze and Maximize Strength of Design
CNC-Milled Dies for Single Piece Forms
Reduced Number of Sections in Construction
Minimized Weld Joints and Maximized Strength and Durability
The Boeing 777 relies on just two wing engines to provide thrust for flight. Thus, in its development, engineers determined that no other power should be bled off them for system hydraulics, and designed a space in its tail for a third, auxiliary gas turbine engine, or APU (as found in numerous other aircraft). To remove heat generated by the APU, an axial, vane type fan, driven off the APU gearbox, is usually provided to pump cooling air past the oil cooler and the compartment. But because of the high speeds and rotating parts, these fans are susceptible to mechanical failures. When they do occur, it requires that the aircraft be removed from operation. Further, these fans sometimes leak oil into the cooling flow which then covers the oil cooler fins resulting in reduced heat transfer and the possibility of an APU automatic shutdown because of excessive oil temperature.