MIL-PRF-26139D
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a
conflict between the text of this document and the references cited herein, the text of this
document takes precedence. Nothing in this document, however, supersedes applicable laws and
regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Components. The tester shall be manufactured using the latest technology available.
However, at the very least, it should consist of the following major components and accessory
equipment:
a. Electrical System Hardware) (see 3.7)
b. Diesel Engine System (see 3.8)
c. Canopy Seal System (see 3.9)
d. Pressurization System (see 3.10)
e. Instrument Control Panel (see 3.11)
f. Housing (see 3.12)
g. Trailer (see 3.13)
h. Accessory Equipment (see 3.14)
3.2 Materials.
3.2.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided
that the material meets or exceeds the operational and maintenance requirements, and promotes
economically advantageous life cycle costs.
3.3 Processes. The processes used for the testers shall not rely on hazardous or toxic materials, or
Class I Ozone Depleting Chemicals (ODCs), in accordance with the 1990 Clean Air Act
Amendment.
3.4. Protective treatment. When materials used in the construction of the tester are subject to
deterioration when exposed to climatic and environmental conditions, likely to occur during
service usage, they shall be protected against such deterioration in a manner that will in no way
prevent compliance with the performance requirements of this specification. The use of any
protective coating that will crack, chip, or scale with age or extremes of climatic and
environmental conditions shall be avoided.
3.5 Performance requirements. The tester shall provide a range of 10 through 400 cubic feet per
minute (CFM); standard airflow -- 0.765 through 30.6 pounds per minute (PPM) and a pressure
range of 2 through 12.5 pounds per square inch gage (PSIG). The canopy seal pressure system
shall provide 1 CFM standard air at 65 PSI.
3.5.1 Safety devices. Shields and caution notes shall be furnished where necessary and maximum
use shall be made of applicable safety devices.
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