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Control
The LPTACC system operates automatically. The EEC normally
gets PO, PT and TAT from the ADIRUs through the display
electronic units (DEUs). The EEC gets N1 and EGT from engine
sensors. The EEC uses these data to schedule the quantity of
fan discharge air that goes to the LPT case. The EEC sends a
signal to the HMU. The HMU sends servo fuel pressure to move
the piston in the LPTACC valve actuator. The piston connects
with the fan discharge air butterfly valve.
See the engine fuel and control section for more information on
how the EEC gets P0, PT and TAT data. (SECTION 73-21)
The LPTACC valve has two RVDTs. The EEC uses the RVDTs to
monitor the position of the LPTACC actuator. One RVDT sends
the signal to channel A of the EEC. The other RVDT sends the
signal to channel B.
Training Information Point
You can see the LPTACC position in percent on the engine
maintenance pages of the control display units (CDUs).
See the engine indicating section for more information on the
engine maintenance pages in the CDU. (SECTION 73-30)
ENGINE AIR - LPTACC - FUNCTIONAL DESCRIPTION
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CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General Description
The transient bleed valve (TBV) system controls the quantity of
the high pressure compressor (HPC) 9th stage bleed air that
goes into the stage 1 low pressure turbine (LPT) nozzles. The
TBV system increases the HPC stall margin during engine start
and during engine acceleration.
The TBV system has these parts:
* TBV valve
* TBV manifold.
ENGINE AIR - TRANSIENT BLEED VALVE (TBV) - GENERAL DESCRIPTION
EFFECTIVITY
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Component Locations
These transient bleed valve (TBV) system components are on
the high pressure turbine (HPT) case:
* Transient bleed valve (6:00 position)
* TBV manifold (5:00 position).
You open the two fan duct cowls and thrust reverser cowls to
get access to the TBV system components.
ENGINE AIR - TBV - COMPONENT LOCATION
EFFECTIVITY
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Physical Description
The TBV controls the quantity of 9th stage bleed air that goes to
the stage 1 LPT nozzles. The air flows from the TBV valve
through the TBV manifold to the LPT case. The air then goes
through holes in the LPT nozzles and mixes with the exhaust.
The TBV system has a piston type actuator. The HMU sends
servo fuel pressure to the rod side and the head side of the
piston in the actuator. The TBV valve has two positions, open
and closed. The servo fuel pressure causes the piston to move.
The piston moves the butterfly valve to the open or closed
positions. The TBV actuator has a drain port to drain fuel that
leaks past the rod seal.
The TBV has a dual wound LVDT. This LVDT sends TBV
　
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