0018933 were subjected to environmental tests at North American Aviation Co. during the month of July. The tests included low temperature cycle, vibration and acceleration, For the low temperature tests, the forward and aft seals were closed and the programmer and its container were removed, ‘placed on the "O-rings" of the forward and aft seals, Thermocouples were The assembly was brought to room temperature (75 F°) and the coJd chamber was stabilized at -65 F°, The nose cone was placed in the cold chamber and allowed to stand for five minutes, -temperature was At the end of that time, the forward seal "O-ring" -10 F°. The nose cone was removed from the cold chamber and allowed to remain at room temperature for 4 minutes, then completely submerged in water for one minute and allowed to float at its normal level for 4 minutes, When the cone was remcved from the water and disassembled, it was found that no leakege had occurred. The cone used for the vibration test was a complete flight-ready- assembly except that the skin around the diffuser had been removed. The acceleration load was maintained at 5 g's while the vibration frequency was varied from 3 to 2000 cycles per second. The dwell time at each resonant frequency was one minute, The vibration was 2pplied first in the plane parallel to the longitudinal center-line of the assembly, then in the plane perpendicular to the center-line, No failures occurred.