MIL-PRF-83990A
4.5 Tests. The oven shall be in compliance with all tests. Failure to comply with all tests
shall be cause for rejection. The following table provides a cross-reference of the Section 3
requirements tested or verified in the paragraphs below.
Requirements Cross-Reference Matrix
REQUIREMENT
VERIFICATION
3.3 and 3.3.1
4.5.1
3.5.1.2
4.5.4
3.5.3
4.5.2.2
3.5.7
4.5.2.1
3.5.10
4.5.5
3.5.12
4.5.3
3.5.13
4.5.1.1
3.5.14
4.5.7
3.5.16
4.5.6
3.6.5
4.5.9
3.6.6
4.5.8
4.5.1 Durability/operational test. The oven shall successfully complete at least 50 cycles.. A
complete cycle shall consist of heating the oven from ambient temperature to the maximum
specified temperature and cooling it back down to ambient temperature. All safety items and
safety interlocks shall be checked for proper operation by simulating failure of key components
such as fans, sticking thermostat, sticking main contactor and/or by purposely mis-operating the
oven controls to whatever extent that might be inadvertently possible during normal use.
4.5.1.1 Heating Units. Heating unit performance shall be monitored during the tests of 4.5.1.
Failure to reach the maximum temperature within the allowable 50 minutes time frame shall be
cause for rejection.
4.5.2 Deflection and rigidity tests.
4.5.2.1 Shelf deflection test. A shelf shall be supported in the same manner as it is supported
in the oven and shall have a load of 50 pounds placed at its center for a period of five minutes and
then removed. The shelf shall not deflect more than ¼-inch or receive any permanent deformation.
4.5.2.2 Bottom deflection test. For walk-in ovens, a person weighing at least 200 pounds shall
walk randomly around and about the oven floor for five minutes. The oven bottom shall not buckle
or receive any permanent deformation or damage. The floor/bottom of an oven not large enough
for or classified as walk-in, shall be tested by placing a 50 pound load, of no more than 30 square
inches bearing area, at a minimum of five locations about the floor. The load shall remain in place
at each location for at least three minutes. No permanent deformation or damage to the floor shall
result.
4.5.3 Thermostat accuracy test. A calibrated thermocouple shall be placed near the center of
the oven to determine the thermostat accuracy. The thermostat shall be set to the maximum
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