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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.