MIL-PRF-25478D
3.11 Identification. The oil cooler shall be permanently and legibly marked with the
following (see 6.2).
a.
Nomenclature
b.
Serial number
c.
National stock number
d.
Contract number
e.
Manufacturer's CAGE code
f.
Manufacturer's part number
g.
Date of manufacture
3.11.1 Synthetic rubber parts. If used, synthetic rubber parts, except parts without
suitable surface area, shall be marked with the cure date.
3.12 Interchangeability. All parts having the same manufacturer's part number shall be
functionally and dimensionally interchangeable.
3.13 Cleaning. The oil cooler shall be free of acids, alkaloids, halides, or other foreign
materials.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.2 First article inspection. When required (see 6.2), first article inspection shall be
performed on two complete oil coolers and shall include the tests indicated in 4.6.
4.3 Conformance inspection. Conformance inspection shall include the tests indicated in
4.3.1 and 4.3.2.
4.3.1 Individual tests. Each oil cooler shall be subjected to the following tests:
a. Examination of [product (see 4.6.1)
b. Cleaning (see 4.6.2)
c. Static pressure test (see 4.6.3)
4.3.2 Sampling tests. A sample of oil coolers shall be selected in accordance with
ASQC-Z1.4, and shall be subjected to the following tests at the inspection level (normal,
tightened, or reduced) specified in the acquisition document (see 6.2). (In the oil pressure drop
without air flow test, only one measurement, with oil at a temperature of 145o +2oF, shall be
made):
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