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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
75-22-00-010
ENGINE AIR - LOW PRESSURE TURBINE ACTIVE CLEARANCE CONTROL (LPTACC) - GENERAL DESCRIPTION
ENGINE AIR - LOW PRESSURE TURBINE ACTIVE CLEARANCE CONTROL (LPTACC) - GENERAL DESCRIPTION
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
75-22-00-010
Component Locations
These components of the LPTACC system are on the right side
of the engine high pressure compressor (HPC) case:
* LPTACC valve (4:00 position)
* LPTACC air duct (4:00 position).
Air enters the LPTACC intake port in the fan duct. The intake
port is at the 4:00 position on the inner wall of the fan duct aft of
the fan. the LPTACC valve connects to the intake port. The
LPTACC air duct connects the LPTACC valve to the LPTACC
manifolds. The LPTACC manifolds surround the low pressure
turbine (LPT) case.
You open the right fan cowl and thrust reverser to get access to
the LPTACC system components.
ENGINE AIR - LPTACC - COMPONENT LOCATIONS
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
75-22-00-020
ENGINE AIR - LPTACC - COMPONENT LOCATIONS
ENGINE AIR - LPTACC - COMPONENT LOCATIONS
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
75-22-00-020
Physical Description
The LPTACC valve controls the quantity of fan discharge air that
goes to the LPT case. The LPTACC manifold sends the fan air to
spray tubes around the LPT case. Holes in the spray tubes
direct the fan air onto the LPT case. The LPTACC air duct
connects the valve and the manifold.
The LPTACC valve is a modulating valve that operates with fuel
pressure. It has these parts:
* Valve body
* Rotary variable differential transformer (RVDT) housing
* RVDT connectors (2)
* Fuel manifold mount flange
* Fuel drain line connection
* Actuator
* Butterfly valve.
The actuator and the butterfly valve (not shown) is in the valve
body.
The LPTACC valve has a fuel-operated piston valve. The HMU
sends servo fuel to either the rod side or head side of the piston
in the actuator. The actuator controls the position of the a
butterfly valve. The butterfly valve controls fan air flow to the
LPTACC manifold. Two RVDTs send butterfly position signals to
the EEC. The LPTACC has a drain port to drain fuel that leaks
from the actuator shaft seal.
Training Information Point
You remove the LPTACC valve as an assembly.
ENGINE AIR - LPTACC - VALVE
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
75-22-00-030
ENGINE AIR - LPTACC - VALVE
ENGINE AIR - LPTACC - VALVE
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
75-22-00-030
ENGINE AIR - LPTACC - VALVE
ENGINE AIR - LPTACC - VALVE
EFFECTIVITY
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
75-22-00-030
THIS PAGE IS INTENTIONALLY LEFT BLANK
ENGINE AIR - LPTACC - VALVE
75-22-00
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The EEC uses these data to schedule the LPTACC valve:
* Total air pressure (PT)
* Ambient pressure (P0)
* Total air temperature (TAT)
* N1
* Exhaust gas temperature (EGT).
The EEC calculates the LPT tip clearance based on the airplane
and engine data listed above. In general, the LPTACC airflow
increases when the parameters above increase.
　
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