Oxygen systems—Continued liquid oxygen (LOX) systems—Continued system components—Continued low-pressure switch, 4-15 miniature oxygen breathing regulator, 4-16 to 4-17 oxygen lines, 4-16 oxygen regulators, 4-16 oxygen shutoff valve, 4-16 pressure control valve, 4-14 quantity indicating system, 4-15 to 4-16 quick-disconnect couplings, 4-15 relief valves, 4-14 system maintenance, 4-24 to 4-25 system operation, 4-22 to 4-24 buildup sequence, 4-22 to 4-24 fill sequence, 4-22 supply sequence, 4-24 onboard oxygen generating system, 4-25 system components, 4-25 system operation, 4-25 P Parachute NES-12E, 6-22 Personnel parachute subsystem, 6-58 to 6-60 Portable oxygen systems, 4-9 Post-ejection sequencing subsystem, 6-58 Pressurization and air-conditioning systems, 3-1 to 3-45 air cycle air-conditioning systems, 3-4 to 3-11 common air-conditioning components, 3-7 to 3-10 system operation, 3-4 to 3-7 anti-ice add heat valve, 3-7 avionics ram air servo, 3-5 compressor protective temperature sensor, 3-6 condenser/vent suit heat exchanger, 3-6 flow modulating system pressure regulator valve, 3-5 primary ejector valve, 3-5 primary heat exchanger, 3-5 refrigeration turbine/compressor assembly, 3-7 reheater heat exchanger, 3-6 secondary ejector valve, 3-6 secondary heat exchanger, 3-6 Pressurization and air-conditioning systems— Continued air cycle air-conditioning systems— Continued system operation—Continued turbine protective temperature sensor, 3-6 water extractor, 3-6 to 3-7 water spray nozzle, 3-6 system testing, 3-7 aircraft pressurization systems, 3-30 to 3-39 maintenance and inspection, 3-34 to 3-37 electrical failures, 3-35 troubleshooting, 3-35 to 3-37 multimeter troubleshooting skills, 3-37 to 3-39 multimeter, 3-37 to 3-38 multimeter safety precautions, 3-38 to 3-39 pressurization system, 3-30 to 3-34 component description, 3-33 to 3-34 system operation, 3-31 to 3-33 cabin cooling and antifog systems, 3-12 to 3-15 automatic drain valve, 3-14 automatic temperature control, 3-14 to 3-15 cabin add heat valve, 3-12 cabin air overtemperature sensor, 3-12 cabin airflow/temperature sensor, 3-14 cabin defog plenum distribution valve, 3-14 cabin flow valve, 3-12 control handle and linkage, 3-14 ECS ram air actuator assembly, 3-12 ECS ram air solenoid assembly, 3-12 to 3-14 manual temperature control, 3-15 push-pull control, 3-14 suit/cabin temperature control, 3-14 environmental control systems, 3-2 to 3-4 bleed-air leak detection, 3-4 bleed-air system, 3-3 to 3-4 air isolation valve, 3-4 engine bleed-air check valve, 3-3 engine bleed-air pressure regula- tion and shutoff valve, 3-3 INDEX-5