MIL-PRF-49175C(CR)
4.2 Inspection conditions. Except as otherwise specified herein, all
examinations and tests shall be performed at a temperature of 80 ± 20°F.
4.2.1. First article inspections. First article inspections shall be
performed by the contractor after award of contract and prior to production.
First article inspection shall be performed on sample units which have been
produced with equipment and procedures normally used in production. Inspections
required for First Article are listed in Table I.
4.2.2 Failure. If one or more sample coolers fail to meet any of the
first article requirements and tests, the contractor shall immediately notify
the government of the failure, the contractor shall determine the root cause of
the failure and take appropriate corrective action. The contractor is required
to submit a new set of first article samples which have incorporated the charges
for inspection. A description of the failures and corrective action taken
should be included in the first article inspection reports.
4.2.3 Test. Upon successful completion of the inspections specified in
4.2.1, four first article coolers shall be subjected to reliability testing and
2 first article coolers shall be subjected to all other tests listed in Table I.
Tests may be conducted in any order. Failure of any test shall constitute first
article failure.
4.2.3 1 Disposition of first article samples. First article samples
shall not be considered as part of the procurement quantities.
TABLE I.
First article inspection.
Inspection
Requirement
Test
paragraph
paragraph
Cooling capacity
3.5.1
4.5.1
Cooldown time
3.5.2
4.5.2
Input power
3.5.3
4.5.3
Acoustic noise
3.5.4
4.5.4
Leak rate
3.5.5
4.5.5
Vibration output
3.5.6
4.5.6
Restart
3.5.7
4.5.7
Temperature shock
3.6.1
4.6.1
High temperature
3.6.2
4.6.2
Low temperature
3.6.3
4.6.3
Shock
3.6.4
4.6.4
Vibration
3.6.5
4.6.5
Reliability
3.8
4.8
4.3 Inspection procedures for verification. Unless otherwise specified
herein, the cooler shall be operated at an ambient temperature of +23°C ±5°C.
Adequate heat sinking or convective cooling shall be provided to ensure that any
point on the cooler cylinder head shall fall within 5°C to 15°C above ambient air
temperature. (See 3.6)
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