AIR BLEED SYSTEM

The design of most turbojet and turboprop engines in aircraft incorporates an air bleed system. An air purge system uses a network of ducts, valves and regulators to conduct medium to high pressure air, "bleed" from the compressor section of the (engines) and APU, to various locations within the aircraet.

Pressurisation

Air conditioning

Engine start

wing and engine anti-ice systems

Water system pressurisation

Hydraulic system rescruoir presuration

Bleed air is the name given to the air that is "bled" from the compressor stage of an engine.it this stage the air is around 200-250°c. and at a medium -high pressure so its energy can be used to power a number of systems. Incluiding but not limited to the air conditioning.

Bleed air is extracted from the compressor of the engine or Apu. The specific stage of the compressor from which the air id bled varies by engine type.

In some engines, air may be taken from more than one location for different uses as the temperature and pressure of the air is variable dependent opon the compressor stage at which it is extracted. Bleed air typically has a temperature of 200-250 degrees c. and a pressure of approtimately 40 ps,exiting the engine pylon.

Precool

Precool control valve

Starter or ingition valve

Duct pressure transmitter

Thermal anti- ice (TAI)

Isolation valve

Apu bleed air valve

Bleeding system valves engine.