Pressure altitude tests of the Army AN/MSQ-114 control terminal

The Army AN/MSQ-114 Control Terminal was tested to determine the effects of 40,000 ft and 10,000 ft pressure altitudes on the transportability and operability, respectively, of the electronic equipment inside the terminal. During the operational test phase (10,000 ft) of the first tunnel entry, a problem developed with the electronic equipment and testing was terminated. The equipment was subsequently modified and tested successfully during a second entry.