MIL-PRF-83178C
3.4.4 Finish. Unless otherwise specified in this specification, regulator surfaces shall not
be painted.
3.5 Interface.
3.5.1 Regulator surfaces. Regulator surfaces visible after installation, the test ports, and
the test port cap shall be flat black, color number 37038 of FED-STD-595.
3.5.2 Regulator panel. The panel shall conform to SAE-AS7788 and the panel marking
shall conform to figures 1 and 3. The background color of the panel shall be flat black, color
number 37038 of FED STD-595.
3.5.3 Flow indicator. A flow indicator, conforming to figure 1, shall be provided on the
regulator panel and shall show white when oxygen is flowing.
3.5.4 Pressure gage. The regulator panel shall be provided with a pressure gage
conforming to MIL-G-25520. The pressure gage shall indicate oxygen system pressure with the
supply lever in either the on or off position.
3.5.5 Pipe threads. Pipe threads shall conform to ANSI/ASME-B1.20.1.
3.5.6 Dimensions. The regulator shall conform to dimensions shown on figures 1, 2, 4,
5, and 6.
3.5.7 Panel fasteners. Panel fasteners shall conform to MIL-F-25173 (see figures 1 and
2).
3.5.8 Test ports. The regulator shall incorporate test ports on the panel conforming to
figure 5. Test ports shall not obstruct the view of the flow indicator and pressure gage. With a
pressure altitude of 34,000 feet applied to the pressure breathing test port, the regulator shall
deliver an outlet pressure between 1.0 to 3.5 inches of water. With a pressure altitude of 43,000
feet applied to the pressure breathing test port, the regulator shall deliver an outlet pressure
between 4.5 to 10.0 inches of water (see 6.10). At a pressure altitude between 27,000 and 32,000
feet, the air mixing valve and air inlet test port check valve shall close, and the added oxygen
ratio shall be as specified (see 3.6.11). Vacuum applied to the pressure breathing test port shall
not be applied to the main body of the regulator. With the diluter lever in the 100% oxygen
position and a vacuum of 4 inches of water applied to the pressure breathing test port, the
leakage from the pressure breathing test port shall be less than 0.02 liters per minute (LPM).
3.5.9 Supply lever coloring. The lever coloring shall conform to figure 1.
3.5.10 Diluter lever coloring. The lever coloring shall conform to figure 1.
3.5.11 Pressure lever coloring. The pressure lever coloring shall conform to figure 1.
3.6 Performance.
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