Gultst ream IV OPERATING MANUAL PNEUMATICS 2A-36-10: General The purpose of the pneumatics system is to provide a common manifold, known as the bleed air manifold. with hot compressed air for use by other systems. Therefore, this section describes the sources of air for the bleed air manifold. their controls and the indications they provide to the flight crew. The airplane systems which use air from the bleed air manifold are described in the appropriate sections of this chapter. The pneumatics system uses the following types of bleed air • Low pressure (LP) bleed air from the engines • High pressure (HP) bleed air from the engines • Bleed air from the single compressor stage of the Auxiliary Power Unit (APU) • External air from a comparable bleed air source (external pneumatic rig) The pneumatics system consists of two identical and independent systems that provide a temperature controlled, pressure regulated air supply for the various using systems. such as air conditioning, wing and nose cowl anti-icing, cabin pressure, engine starting and door seal systems. The pneumatics system receives its air supply from the mid- stage and high-stage ports of the engines. Cooling air Is supplied to the precooler by a fan port while bleed air is extracted from either the mid-stage or high-stage port, depending on need. Temperature control is provided by both an electro-pneumatic control system (bleed air manifold temperature control) and a fully pneumatic subsystem (anti-ice augmentation temperature control). Pressure regulation is fully pneumatic for both manifold pressure regulation and dual setting high-stage switching pressure control. The bleed air manifold can be termed that portion of the system from the right and left bleed air pressure regulator and shutoff valves and precoolers inboard. It is essentially a distribution point for all airplane pneumatic services. except those tapped off at each engine for engine services. The manifold is. as a