TM 1-1510-225-CL P-1 PERFORMANCE CHECKS OXYGEN SYSTEM 1. Passenger manual drop-out – Push off. 2. Oxygen system – Crew ready. 3. Crew masks – 100%; check operation and stow. NOTE 1850 psi at 15° is a fully charged bottle. Read duration directly from P-1. a. Read oxygen pressure from the gauge. b. Read the OAT (with battery on). c. Determine the percent of usable capacity fromFigure P-1 (e.g., 1100 psi at 0 °C = 57%). d. Compute the oxygen duration in minutes fromTable P-1 by multiplying the full bottleduration by the percent of usable capacity, asin the following example. NOTE For oxygen duration computations, count each diluter-demand crew mask in use as two (e.g., with four passengers and a crew of two, enter the table at eight people using). (1) Pilot and copilot with masks set at 100%plus 6 passengers = 10 people usingoxygen. (2) Cylinder volume =115 cubic feet. (3) Duration with full bottle = 73 minutes. (4) Duration with 57% capacity: 0.57 x 73 =41 minutes.
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