Creating a process description

Creating a process description

Operation of the Auto braking System

Aircraft pneumatic systems are mostly used as an emergency source of pressure for hydraulically operated subsystems. The pneumatic power system usually consists of one or more high pressure air cylinders, pressure gauges, and pressure warning lights. Since the pneumatic power source does not replenish itself during flight, the compressed supply is good for only a certain number of operations.

Construction. High pressure pneumatic systems are constructed to operate in much the same manner as hydraulic systems (Aleksendric, 2007). A shuttle valve connects the pneumatic system to the hydraulic system. This allows these of the same tubing and units for both systems. The shuttle valve separates the normal hydraulic system from the pneumatic system. Pneumatic system selector valves control the air to the subsystems. Each subsystem is connected to the high pressure air source through a pressure regulator and relief valve assembly and a selector valve. Since pneumatic selector valves are installed in parallel, air pressure is immediately available to all subsystems for instant operation. Connected in this manner, more than one system can be operated at the same time. Servicing. The air cylinders are charged through a ground test filler connection by a portable nitrogen cart or a high pressure air compressor. All nitrogen or air is filtered by a filter in the service line.

All hydraulic brake systems operate on the same basic principle (Aleksendric, 2007). When the operator moves a brake pedal or other brake operating control, the movement is transmitted to a master cylinder or to a power brake control valve from which fluid pressure is delivered through connecting lines to a brake assembly connected to a wheel or shaft whose movement is to be broken. The fluid pressure acting on the brake assembly pushes brake linings ...