MIL-PRF-62048C
Insert a new filter element prior to performing the service life test.
4.5 Methods of inspection.
4.5.1 Materials. Conformance to 3.2 and 3.3 shall be determined by inspection of
contractor records providing proof or certification that materials conform to requirements.
Applicable records shall include drawings, specifications, design data, receiving inspection
records, processing and quality control standards, vendor catalogs and certifications, industry
standards, test reports, and rating data.
4.5.2 Defects. Conformance to 3.3, 3.4.1 through 3.4.5, 3.4.11, 3.5, and 3.6 shall be
determined by examination for the defects listed in table III. Examination shall be visual or by
measurement with standard inspection equipment (SIE).
4.5.3 Performance. Unless otherwise specified herein, performance tests shall be
conducted on the assembly. Unless otherwise specified herein, test conditions shall be in
accordance with 3.4.
4.5.3.1 Air leakage resistance. To determine conformance to 3.4.6 the following air
leakage test shall be conducted. Connect the air cleaner outlet to a flowmeter and suction pump,
and the inlet to a vacuum indicator. Seal all air cleaner openings except for the suction line.
(0.3 cfm) to
The flowmeter shall be sized and accurate to measure flowrates of 0.5
accuracy. The vacuum indicator (manometer or gauge) shall read to 12.5 kPa (50 inch of water)
with an accuracy of
kPa (0.2 inch of water). Pump down the system to a vacuum of
12.5 kPa (50 inch of water) at the air cleaner inlet and hold for five minutes. The flowmeter
shall indicate an airflow rate of not more than 0.5
(0.3 cfm) while the vacuum is held at
12.5 kPa (50 inch of water).
4.5.3.2 Airflow restrictions. To determine confor mance to 3.4.7, the air cleaner shall be
set up in accordance with figure 2, and subjected to a dust free airflow through a new filter
element. Determine and record airflow restriction at rated flow.
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