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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
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LOW PRESSURE TURBINE CLEARANCE CONTROL
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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5BEFG LOW PRESSURE TURBINE CLEARANCE CONTROL TRAINING MANUAL
The LPTCC system uses fan discharge air to cool the LPT case during engine operation, in order to control the LPT rotor to stator clearances.
It also protects the turbine case from over-temperature by monitoring the EGT.
This ensures the best performance of the LPT at all engine ratings.
The LPTCC system is a closed loop system, which regulates the cooling airflow sent to the LPT case, through a valve and a manifold.
The LPTCC valve is located on the engine core section between the 4 and 5 o’clock positions.
The LPTCC system consists of:
- An air scoop.
- The LPTCC valve.
- An air distribution manifold.
- Six LPT case cooling tubes.
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ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
LOW PRESSURE TURBINE CLEARANCE CONTROL
LPTCC valve.
The LPTCC valve includes a linear actuator with a gear section, which rotates a butterfly valve shaft.
The actuator is attached to a control plate, which has three holes.
Two of these holes are used for valve actuation:
-One hole ports modulated pressure from the servo valve to one side of the actuator.
-The second hole ports Pcr pressure to the other side of the actuator.
The modulated pressure is either greater, or smaller, than Pcr and determines the direction of the actuator motion.
The third hole is a drain port designed to collect leakage from the actuator and direct it to the draining system.
A dual RVDT sensor is fitted at one end of the butterfly valve shaft and supplies electrical signals proportional to the valve position.
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