DOC AIRBUS | AMM A320FENGINE ANTI-ICING - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The Engine Anti-Icing consist of:
The Engine Anti-Icing consist of:
- Start-Bleed/Booster Anti-Ice (BAI) valve and actuator
- Anti-ice tube and manifolds
- Flow splitter.
A. Start-Bleed/Booster Anti-Ice (BAI) Valve and Actuator
The Start-Bleed/Booster Anti-Ice (SB/BAI) valve is a two-function single valve controlled by the Electronic Engine Control (EEC). The BAI exhaust port is opened when the ice is collected on the booster. When the BAI exhaust port is open, the High Pressure Compressor (HPC) 7th stage air is ported to the low pressure compressor (Booster).
The EEC uses servo fuel to control the BAI exhaust port to direct HPC 7th stage air to the anti-ice tubes. A dual-redundant Rotational Variable Differential-Transducer (RVDT) is part of the actuator to convert the mechanical position of the actuator to an electrical position signal available to the EEC. Only one EEC controls the SB/BAI valve at any point in time. A dual-redundant RVDT configuration means there are two separate electrical feedback signals to the EEC but only one signal is needed to determine the valve position. Even though the electrical signals are redundant, the RVDT contains a single mechanical element.
The start function of SB/BAI valve and actuator will be included in starting (Ref. AMM D/O 80-00-00-00).
The Start-Bleed/Booster Anti-Ice (SB/BAI) valve is a two-function single valve controlled by the Electronic Engine Control (EEC). The BAI exhaust port is opened when the ice is collected on the booster. When the BAI exhaust port is open, the High Pressure Compressor (HPC) 7th stage air is ported to the low pressure compressor (Booster).
The EEC uses servo fuel to control the BAI exhaust port to direct HPC 7th stage air to the anti-ice tubes. A dual-redundant Rotational Variable Differential-Transducer (RVDT) is part of the actuator to convert the mechanical position of the actuator to an electrical position signal available to the EEC. Only one EEC controls the SB/BAI valve at any point in time. A dual-redundant RVDT configuration means there are two separate electrical feedback signals to the EEC but only one signal is needed to determine the valve position. Even though the electrical signals are redundant, the RVDT contains a single mechanical element.
The start function of SB/BAI valve and actuator will be included in starting (Ref. AMM D/O 80-00-00-00).
B. Anti-Ice Tube and Manifolds
Anti-ice tubes and manifolds are composed of four segments. The BAI air tube directs the HPC 7th stage air to the BAI tube. The BAI tube is connected between the BAI air tube and the intermediate hose. The right hose and a left hose supply anti-ice air to the flow splitter. The intermediate hose is connected to the anti-icing tube from the HPC by a screwed V-clamp fixture. The left and right hoses are fixed to vane 3 through screwed omega clamps and brackets.
Anti-ice tubes and manifolds are composed of four segments. The BAI air tube directs the HPC 7th stage air to the BAI tube. The BAI tube is connected between the BAI air tube and the intermediate hose. The right hose and a left hose supply anti-ice air to the flow splitter. The intermediate hose is connected to the anti-icing tube from the HPC by a screwed V-clamp fixture. The left and right hoses are fixed to vane 3 through screwed omega clamps and brackets.
C. Flow Splitter
The functions of the flow splitter are:
The functions of the flow splitter are:
- To separate primary and secondary air flows
- To evacuate the hot air that comes from the anti-ice tubes in the primary flow to avoid ice collection on the splitter forward end.
Due to their dimensions 5.5 mm (0.22 in.) x 2 mm (0.08 in.) and the air pressure (HPC 7th stage air), the blockage of the notches is considered not realistic. The flow splitter is a one piece titanium forged/machined part that includes 188 notches for hot gas evacuation to the outer surface of the splitter.