DOC AIRBUS | AMM A320FMODULATED TURBINE CONTROL AND CORE COMPARTMENT COOLING SYSTEM - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
A. Modulated Turbine Cooling (MTC) System
The function of the Modulated Turbine Cooling (MTC) system is to modulate the High Pressure Turbine (HPT) Stage 1 (S1) blade cooling flows to optimize fuel burn. The HPT S1 blade cooling flow is determined by the heat loads at take-off and climb. At low power operations (cruise, descent and ground operations), the MTC system reduces HPT S1 cooling flow. At high power operations (take-off and climb-out), the MTC system does not decrease HPT S1 blade cooling flow. The HPT S1 blade cooling flow is derived from the compressor discharge air.
The function of the Modulated Turbine Cooling (MTC) system is to modulate the High Pressure Turbine (HPT) Stage 1 (S1) blade cooling flows to optimize fuel burn. The HPT S1 blade cooling flow is determined by the heat loads at take-off and climb. At low power operations (cruise, descent and ground operations), the MTC system reduces HPT S1 cooling flow. At high power operations (take-off and climb-out), the MTC system does not decrease HPT S1 blade cooling flow. The HPT S1 blade cooling flow is derived from the compressor discharge air.
Cooling - MTC System - GeneralB. Core Compartment Cooling (CCC) System
PRE SB 72-0270
The function of the Core Compartment Cooling (CCC) system is to supply booster exhaust and/or fan cooling air flow to the engine under cowl environment to allow sufficient operating temperatures under all operating conditions. The CCC system is a passive system and has no incorporated active components. Dedicated ducts on both sides of the engine take cooling air from the Variable Bleed Valve (VBV) ducts directly to impinge cooling air onto required components.
END OF PRE SB 72-0270
POST SB 72-0270
The function of the Core Compartment Cooling (CCC) system is to supply booster exhaust and/or fan cooling air flow to the engine under cowl environment to allow sufficient operating temperatures under all operating conditions. The CCC system is a passive system and has no incorporated active components. Dedicated ducts on RHS side of the engine take cooling air from the Variable Bleed Valve (VBV) ducts directly to impinge cooling air onto required components.
END OF POST SB 72-0270
PRE SB 72-0270
The function of the Core Compartment Cooling (CCC) system is to supply booster exhaust and/or fan cooling air flow to the engine under cowl environment to allow sufficient operating temperatures under all operating conditions. The CCC system is a passive system and has no incorporated active components. Dedicated ducts on both sides of the engine take cooling air from the Variable Bleed Valve (VBV) ducts directly to impinge cooling air onto required components.
END OF PRE SB 72-0270
POST SB 72-0270
The function of the Core Compartment Cooling (CCC) system is to supply booster exhaust and/or fan cooling air flow to the engine under cowl environment to allow sufficient operating temperatures under all operating conditions. The CCC system is a passive system and has no incorporated active components. Dedicated ducts on RHS side of the engine take cooling air from the Variable Bleed Valve (VBV) ducts directly to impinge cooling air onto required components.
END OF POST SB 72-0270
2. Description
A. MTC System
The components of the MTC system are as follows:
PRE CFM SB 72-0112
The components of the MTC system are as follows:
PRE CFM SB 72-0112
- Two MTC Actuators
- Two MTC Valves
- Inner Combustor Forward Manifold
- Three MTC Tubes.
END of PRE-CFM SB 72-0112
POST CFM SB 72-0112 - One (left) MTC Actuators
- One (left) MTC Valves
- Inner Combustor Forward Manifold
- Three MTC Tubes.
END of POST-CFM SB 72-0112
B. CCC System
PRE SB 72-0270
The components of the CCC system are as follows:
PRE SB 72-0270
The components of the CCC system are as follows:
- Right-Hand CCC Air Manifold Assembly
- Right-Hand CCC Rubber Bellows
- Left-Hand CCC Air Manifold Assembly
- Left-Hand CCC Rubber Bellows
- Left-Hand CCC Rubber Duct
- CCC Hose Clamps.
END OF PRE SB 72-0270
POST SB 72-0270
The components of the CCC system are as follows: - Left-Hand CCC Air Manifold Assembly
- Left-Hand CCC Rubber Bellows
- Left-Hand CCC Rubber Duct
- CCC Hose Clamps.
END OF POST SB 72-0270
3. Operation
Depending on the flight conditions, the MTC actuator opens or closes the MTC valve. When the MTC valve is open, HPT Stage 1 cooling air enters through the valve openings to provide cooling airflow to the S1 turbine blade circuit. When the MTC valve is closed, HPT Stage 1 cooling air is blocked from entering through the valve openings. The MTC actuator opens or closes the MTC valve as a function of input current from the servo-valve. The Electronic Engine Control (EEC) gives the actuation control of the MTC system through the electro-hydraulic servo valve. A Linear Variable Differential Transducer (LVDT) 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 MTC system at any point in time. The actuator gives the electrical feedback proportional to piston position through a single channel LVDT.
Depending on the flight conditions, the MTC actuator opens or closes the MTC valve. When the MTC valve is open, HPT Stage 1 cooling air enters through the valve openings to provide cooling airflow to the S1 turbine blade circuit. When the MTC valve is closed, HPT Stage 1 cooling air is blocked from entering through the valve openings. The MTC actuator opens or closes the MTC valve as a function of input current from the servo-valve. The Electronic Engine Control (EEC) gives the actuation control of the MTC system through the electro-hydraulic servo valve. A Linear Variable Differential Transducer (LVDT) 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 MTC system at any point in time. The actuator gives the electrical feedback proportional to piston position through a single channel LVDT.