MIL-PRF-26139D
4.2 Individual tests. Testers shall be subjected to the following tests as described under 4.4.
a. Examination of product (see 4.4.1).
b. Operational test (see 4.4.2).
c. Calibration test (see 4.4.3).
d. Environmental test (see 4.4.4).
4.3 Test conditions.
4.3.1 Standard atmospheric conditions. When the pressure and temperature existing at the time of
the test are not specified definitely, it is understood that the test is to be made at atmospheric
pressure, approximately 29.92 inches Hg, and at room temperature, approximately 73° F. All
airflow readings shall be reduced to standard air readings of 0.07651 PCF at 60° F.
4.3.2 Apparatus and instruments. Apparatus and instruments used in conjunction with testing
specified herein shall be of laboratory precision type and shall be carefully checked to ascertain
that they have been installed in a satisfactory manner for durability and accurate operation and
shall be calibrated at intervals properly spaced to assure laboratory efficiency.
4.3.3 Airflow. The airflow shall be measured by means of the most accurate, scientifically
recognized techniques, instruments and methods and shall be acceptable when certified.
4.3.4 Test periods. Unless otherwise specified, any test run shorter than 1 hour shall not be
counted as test time.
4.3.5 Preliminary run-in and calibration. Any preliminary run-in of the tester as recommended by
the manufacturer shall be performed by the manufacturer prior to submission of the tester for
testing. A certified log of all preliminary running time and calibration data shall be submitted to
the procuring activity.
4.4 TEST METHODS
4.4.1 Examination of product. The tester shall be inspected to determine compliance with
requirements specified herein with respect to parts, materials, workmanship, dimensions, and
marking.
4.4.2 Operational test. With hoses installed, the operation of the tester shall be checked at 400,
200, 100, and 10 CFM standard air at each pressure condition of 12.5, 7.5, and 2.0 PSIG. All
valves, gages, meters, adjustable louvers, accessories, and canopy seal system shall be checked
for satisfactory performance during the test.
4.4.3 Calibration test. The 25-foot length of 3-inch supply hose and 25-foot length of 1/2inch
static hose shall be connected to their respective fittings on the tester and connected to similar
fittings on a 16-cubic-foot test tank. The output of the test tank shall be directed through a
throttling valve into measuring instrument specified in 4.3.3. A laboratory test gage with an
accuracy of 0.50 of 1 percent of full scale shall be installed to read the pressure within the test
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