L&L Special Furnace Co. Inc. supplied a high-uniformity, dual-chamber box furnace to a major airline repair facility located in the southeastern U.S. The furnace, which will be used for solution heat treating of aluminum components and subassemblies for the aerospace industry, is complete with a pyrometry package in accordance with AMS 2750E specifications. The bottom chamber is designed to operate at 400-1100°F (205-595°C)and is primarily used for solution heat treating and annealing. The top chamber is designed to operate at 200-500°F (95-260°C) for aluminum aging. A roll-away quench tank is located under the furnace, which allows for quickly quenching loads in water.

The furnace, which has a work envelope of 18 inches wide x 12 inches high x 72 inches deep, includes thermocouple reference ports located within 2 inches of each control and over-temperature thermocouple. Ports in corner locations are used to place thermocouples to record the hot and cold temperatures as indicated by the most recent thermocouple uniformity survey. The primary controls are UDC3200 program controls, and there are UDC1200 over-temperature protection systems with backup contactors for both chambers.