MIL-PRF-25478D
a. Pressure drop without air flow (see 4.6.5).
b. Pressure cycles (see 4.6.8 and 6.4)
4.4 Test conditions. Unless otherwise specified (see 6.2), all inspections shall be
performed in accordance with the following test conditions.
4.4.1 Ducting. The cooling air inlet and outlet ducts on the test bench shall be equivalent
in size and shape to that of the aircraft installation on which the oil cooler is to be used.
Dimensions shall be as specified in the acquisition document (see 6.2).
4.4.2 Oil. The oil used for all tests shall be specified in the acquisition document (see
6.2).
4.4.3 Tolerances. Unless otherwise specified, the variables specified at fixed values are
permitted to deviate from specified conditions: +2oF for all temperatures, +2% for rated oil flow,
and +2% of rated air flow for any air flow. The calculated heat added to the air (`air temperature
rise' x `air flow' x `specific heat of air') shall be within 5% of calculated heat transferred from
the oil (`oil temperature drop' x `oil flow' x `specific heat of oil'). Heat balance discrepancies of
more than 5%, for all heat rejection runs other than `Oil pressure drop with air flow' are
unacceptable.
4.5 Requirements cross-reference matrix. Table I provides a cross-reference matrix of
the section 3 requirement tested or verified in paragraphs below.
TABLE I. Requirements cross-reference matrix
Requirement
Verification
Requirement
Verification
3.2
4.2
3.8.4
4.6.5
3.4
4.6.1
3.8.5
4.6.6
3.5
4.6.1, 4.6.11
3.8.6
4.6.8
3.5.1
4.6.1, 4.6.9
3.8.7.1
4.6.4, 4.6.5
3.6
4.6.1
3.8.7.2
4.6.4
3.6.1
4.6.1
3.8.7.3
4.6.4
3.6.2
4.6.1, 4.6.4, 4.6.5, 4.6.10
3.8.8
4.6.4
3.6.3
4.6.1, 4.6.4, 4.6.5, 4.6.10
3.9.1
4.6.9
3.7.1
4.6.1
3.9.2
4.6.7
3.7.2
4.6.1
3.10
4.6.1
3.7.3
4.6.1
3.11
4.6.1
3.8.1
4.6.3
3.11.1
4.6.1
3.8.2
4.6.5
3.13
4.6.1, 4.6.2
3.8.3
4.6.4
7
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