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|  MIL-C-37021
4.5.3 Chair tilt and deformation.
4.5.3.1 Chair tilt and deformation (weighted back section, unloaded chair).
The chair shall be mounted in the bottom portion of the carrying case. The
chair shall be positioned and weighted as shown in figure 7 for a minimum of 3
minutes. Upon application of weights, the chair shall be observed for tilt.
After removal of weights, the chair shall be examined for deformation.
4.5.3.2 Chair tilt and deformation (weighted back section, loaded chair).
The chair shall be mounted in the bottom portion of the carrying case. The
chair shall be positioned, weighted and loaded as shown in figure 8 for a
minimum of 3 minutes. Upon application of weights and loads, the chair shall
be observed for tilt. After removal of weights and loads, the chair shall
be examined for deformation.
4.5.3.3 Chair tilt, deflection and deformation (weighted toe section, unloaded
chair). The chair shall be positioned and weighted at the toe section as shown
in figure 9 for a minimum of 1 minute. Upon application of weight, the chair
shall be observed for tilt. With weight applied, deflection shall be measured
at the free end of the toe section. After removal of weight, the chair shall
be examined for deformation.
4.5.4 Chair stability. The chair shall be mounted in the bottom of the
carrying case. The chair shall be positioned and weighted as shown in figure 10.
With weights applied, the chair shall be observed for tilt and measured for
deflection at the back and toe section. Weights shall be removed and the
chair shall be examined for deformation. The entire procedure shall be repeated
with the chair positioned and weighted as shown in figures 11 through 13.
4.5.5 Arm Operation.
4.5.5.1 Arm spring force. The arm control box (completely assembled) shall
be mounted in a vise. As an alternate, the arm spring force can be tested on
the assembled chair. The arm shall be pulled back using suitable instrumentation
such as a spring scale and the force required to hold the arm in its rearmost
position shall be noted. The force shall be tangent to the free end section of
the arm.
4.5.5.2 Arm spring operation. With the control box mounted in a vise or on
the end item as described in 4.5.5.1, the arm shall be operated through 50
complete cycles (one cycle shall be a complete back and forth movement). The
arm assembly shall then be examined for failures or defects.
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