Figure 7–16. Tail Wheel Lock and Emergency Hydraulic Shutoff Valves

TM 1-1520-238-T-5 7–33 7–7. SYSTEM DESCRIPTION (cont) 7– PRESSURE RETURN M68-113A DIRECTIONAL SERVOCYLINDER LOW LEVEL SWITCH UTILITY MANIFOLD PROXIMITY SWITCH TAIL WHEEL LOCK ACTUATOR CHECK VALVE EMERGENCY HYDRAULIC SHUTOFF VALVE TAIL WHEEL LOCK CONTROL VALVE PRESSURE RETURN LEGEND Figure 7–16. Tail Wheel Lock and Emergency Hydraulic Shutoff Valves d. PAS. The PAS system provides air for use by air driven or operated components such as the air turbine starters, environmental control system (ECS), canopy side window defogging, engine cooling louver actuators, hydraulic reservoir pressurization, ice detector sensor, the nitrogen inerting system, and regulated air pressure to the fuel system components. (1) Purpose (fig. 7–17). The PAS cleans, pressurizes, regulates, and distributes air to the following pneumatically operated systems and components: main engine starting, ECS, canopy/windshield defog, louver actuators, ice detector probe, hydraulic system, utility receptacle, nitrogen inerting system, and the air pressure regulating valve (to fuel system).