MIL-PRF-85726 Enclosure, Standard Avionics, Forced Air-Cooled, Specification ForThis specification covers forced air-cooled standard avionics enclosures, hereinafter referred to as enclosures. The enclosures accommodate Standard Electronic Modules \(SEMs\) Format B Span 2, Format C, and Format E, and a standard backplane.

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MIL-PRF-85726B(AS)

3.4.11 Thermal effectiveness. The temperature of any module guide rib shall be not greater

than 85 �C (185 �F). Cooling air exhaust temperature shall be not greater than 71 �C (159.8 �F).

The airflow rate divided by the enclosure power shall be 3.0 lb/KW-minute (1.36 kg/KW-

minute) maximum, when tested as specified in 4.5.3.1.

3.4.12 Thermal leakage. The maximum air leakage rate shall be not greater than 0.1 percent

of the maximum flow rate through the enclosure, when tested as specified in 4.5.3.2.

3.4.13 Electromagnetic shielding effectiveness. The enclosure shall shield against electric,

magnetic, and electromagnetic field radiation, when tested as specified in 4.5.4.1.

3.4.14 Outside-to-inside shielding effectiveness. The outside-to-inside shielding

effectiveness of the enclosure shall meet the requirements shown on figure 5 when tested as

specified in 4.5.4.2.

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. First article inspection shall be performed on two enclosures

when a first article sample is required (see 3.1 and 6.2). This inspection shall consist of the

examination and tests listed in table III.

4.3 Conformance inspection. Conformance inspection shall consist of Groups A, B, and C

inspections (see tables IV, V, and VI).