Engineering prototype of the Space Shuttle Landing Gear Uplock Actuator, measuring approximately 16 x 10 x 11, bearing a Bertea Corporation tag on the center cylinder, reading: "Code Ident No. 82106, Mfg Date 10-76, Part No. 246200-1001, Serial No. 82106-004, Actuator, Uplock, Main Landing Gear, Hyd." In fine condition. This actuator supports pre-flight retraction of the Space Shuttle main landing gear prior to launch, and release of the landing gear just prior to touch-down. An appealing piece of essential Shuttle hardware.