 4. The flow of oxygen to the mask is governed by a demand regulator on the right side of the cockpit. On the side of the regulator is an AUTO MIX lever with ON and OFF positions. and a red knurled knob that opens the emergency bypass. 5. With the AUTO MIX lever in the ON position. the regulator supplies a mixture of air and oxygen automatically determined by your needs. 6. With the AUTO IMIX lever in the OFF position, you breathe pure oxygen each time you inhale. 7. The automatic regulator can be entirely bypassed by opening the emergency red  |
knurled knob on the side of the regulator. This gives you pure oxygen under positive prewure in a steady flow. Caution: Use the red knob only in extreme emergencies, because it depletes your oxygen system in about 8 minutes.  8. The oxygen flow indicator is a blinking light or bouncing ball type and blinks or bounces every time you inhale when the pressure is between 50 and 500 psi. As long as the light blinks or the ball bounces, you know you are getting oxygen. Note: The indicator operates only when the emergency bypass valve is closed. 9. The duration of the oxygen supply depends on the individual pilot and on the altitude. The average is approximately 2 hours in AUTO MIX: about 1 hour in 01-T (pure oxygen) and about 8 minutes when emergency knob is open. The constant flow system is the same as you used in the AT-6. Turn it on when or before you reach 10,000 feet. (8000- 10,000 feet on flights of 4 hours or more.) Control the constant flow system manually by opening a valve on the oxygen gage on the right side of the cockpit. The gage is marked off in altitudes. |
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