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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Component Locations
The HPTACC system components are on the right side of the
engine HPT case. These are the HPTACC system components:
* HPTACC valve (3:00 position)
* 9th stage bleed air duct (2:00 position)
* HPTACC manifold.
The HPTACC manifold starts aft of the HPTACC valve, and goes
around the HPT case. The HPTACC manifold connects to the
HPT shroud support through ports at the 6:00 position and the
12:00 position.
You open the right fan cowl and thrust reverser to get access to
the HPTACC system components.
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Purpose
The HPTACC valve controls the quantity and the ratio of HPC 9th
stage and 4th stage bleed air that goes to the HPT shroud
support. The HPTACC manifold sends the air mixture to the HPT
shroud support.
Physical Description
The HPTACC valve has a 4th stage valve and a 9th stage valve
with one actuator that moves both valves. The actuator is a
piston type actuator. The HMU sends servo fuel to either the
head or rod side of the piston. A shaft with gear teeth on both
sides connect to the piston. The teeth on the shaft connect to a
gear for the 9th stage valve on one side and to a gear for the 4th
stage valve on the other side. The butterfly shaft for each valve
connects to the correct gear. When the piston moves, the shaft
also moves. This causes the gears and butterfly valves for each
valve to turn which causes the valves to open and close. These
are the components of HPTACC valve that you can see from the
outside of the valve:
* 9th stage air valve body
* 4th stage air valve body
* One actuator for both valves
* Two LVDT connectors
* Fuel manifold mount flange
* 4th stage air inlet duct.
There are two LVDTs in the HPTACC valve. The LVDTs give the
HPTACC valve position signals to the EEC. One LVDT gives
valve position to channel A and the other gives valve position to
channel B.
Training Information Point
You remove the HPTACC valve as an assembly.
The HPTACC has a drain port to drain fuel that leaks from the
shaft seal. See engine vents and drains - inspection/check of
the AMM, part II, 71-71 for the allowable leakage rate.
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The EEC uses these data to control the HPTACC valve:
* Ambient pressure (P0)
* N2
* Compressor discharge air temperature (T3)
* HPT shroud support temperature (TCC sensor).
The EEC usually receives P0 from the ADIRUs through the
display electronic units (DEUs). The other data comes from
engine sensors.
See the engine fuel and control section for more information on
how the EEC gets P0 pressure. (SECTION 73-21)
Control
The HPTACC system operates automatically. The EEC uses
aircraft and engine data to control HPC 9th stage/4th stage
bleed air ratio used to cool the HPT shroud support. The EEC
uses the P0 sensors in the EEC if the ADIRU data becomes
invalid. The EEC sends a HPTACC command signal to the HMU.
The HMU sends the correct servo fuel pressure to the rod and
head sides of the HPTACC valve. This moves the valves in the
HPTACC valve. The valve controls the flow of HPC 9th stage and
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