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CTC-201-221-01
EFFECTIVITY
75-22-00 Page 5
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
According to a schedule from the ECU, an electrical order, proportional to the valve position demand, is first sent to the dedicated servo valve within the HMU.
The servo valve changes the electrical information into fuel pressure and sends it to the LPTCC valve.
Within the LPTCC valve, the actuator drives the butterfly, installed in the airflow.
The butterfly valve position determines the amount of fan discharge air entering the manifold and cooling tube assembly.
The built-in RVDT sensor sends the valve position to the ECU as feedback, to be compared with the position demand.
If the valve position does not match the demand, the ECU sends an order, through the HMU, to change the valve state until both terms are equal.

EFG  CFM56-5B  TRAINING  MANUAL 
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CTC-201-219-01
EFFECTIVITY
75-22-00 Page 7
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
Control logic.
In the ECU, the LPTCC calculation block establishes the
valve position demand.
The airflow demand calculation is based on various
parameters such as:

-P0 (ambient pressure).
-PT2 (total pressure).
-N1 state (fan aerothermo-dynamics and speed).
-TAT (Total Air Temperature).
-EGT( Exhaust Gas Temperature).

From these parameters, the ECU calculates the required airflow and valve position for clearance control and protects the turbine case from over temperature by monitoring the EGT.

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CTC-201-222-02
EFFECTIVITY
75-22-00 Page 9
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
THIS PAGE INTENTIONALLY LEFT BLANK

EFG
OIL GENERAL

EFFECTIVITY
79-00-00 Page 1
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
OIL GENERAL
Sump philosophy.
The engine has 2 sumps; the forward and aft.
The forward sump is located in the cavity provided by the fan frame and the aft sump is located in the cavity provided by the turbine frame.
　
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