MIL-PRF-22594C(SH)
TABLE III. Test agenda.
Applicability of test to heater type
First
Tests
Requirement
Verification
Conformance
article
Heater elements
Moisture resistance
ALL
ALL
Dielectric strength
3.12.1.1
ALL
ALL
Insulation resistance
3.12.1.2
ALL
ALL
1/
Accelerated life test
-
ALL 2/
High limit cutout switch
ALL
Vibration
-
3/
and 4/
Shock
-
Heater performance
ALL
-
Kilowatt rating
ALL
-
Airflow resistance
ALL
-
Over-temperature protection
ALL
-
Circuit strength
ALL
ALL
Insulation resistance
ALL
ALL
Creepage and clearance
ALL
-
5/
5/
Nonmagnetic
6/
6/
Maintainability
NOTES:
1/
First production unit of each watt density.
2/
Can be omitted if the cutout switch manufacturer supplies a Certificate of Conformance
certifying that the switch trips within 15 °F of its specified temperature set point.
3/
Test of Size 32EH includes all sizes below Size 32EH. Test of any size heater below Size
32EH includes only those sizes below that size heater.
4/
Test of Size 38EH includes heater Sizes 33EH through 38EH. Test of any size heater below
Size 38EH includes only those heaters below that size heater through Size 33EH.
5/
Only test those units to be designated nonmagnetic.
6/
Demonstrate maintainability only on first production unit of each size.
4.3 Conformance inspection. Conformance inspection shall include the examination of 4.4 and the tests of
table III.
4.4 Examination. Heaters shall be examined and measured to verify compliance with the requirements of this
specification not involving tests. Examination shall be conducted as specified in 4.4.1, 4.4.2, and table IV. Any
heater in the sample containing one or more defects shall be rejected.
4.4.1 Lot. All heaters of the same size and type offered for delivery at one time shall be considered a lot.
4.4.2 Sampling for examination. A random sample of heaters shall be selected from each lot in accordance
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