F. The TCC system and the TVBCA system are controlled by the electronic
engine control (EEC) as a function of altitude and high pressure rotor
speed (N2).
2. High Pressure Turbine Case Cooling Air Shutoff Valve (Fig. 1)
____________________________________________________
A. The shutoff valve for the HPT case cooling air controls the flow of fan
discharge air to the HPT case cooling manifolds (air tubes).
B. The shutoff valve is installed on the HPT case at the 3 o'clock position. The shutoff valve is connected to the shutoff valve for the LPT case cooling air by a linkage attached to the idler arm on the shutoff valve.
C. The butterfly valve is fully modulated with a push-pull control cable
connected to a hydraulic actuator.
3. Low Pressure Turbine Case Cooling Air Shutoff Valve (Fig. 1)
___________________________________________________
A. The shutoff valve for the LPT case cooling air controls the flow of fan
discharge air to the LPT case cooling manifolds.
B. The shutoff valve is installed on the HPT case at the 3 o'clock position. The shutoff valve is operated by a control cable which also operates the shutoff valve for the HPT case cooling air.
4. High Pressure Turbine Case Cooling Collector (Fig. 1)
____________________________________________
A. The HPT case cooling collector, installed on the HPT case at the 4 o'clock position, is connected between the shutoff valve for the HPT case cooling air and the manifolds of the HPT case cooling.
5. Low Pressure Turbine Case Cooling Collector (Fig. 1)
___________________________________________
A. The LPT case cooling collector, installed on the HPT and LPT cases at the 4 o'clock position, is connected between the shutoff valve for the LPT case cooling air and the manifolds for the LPT case cooling.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
TURBINE VANE
SEE A SEE MANIFOLDS COOLING LPT CASE I AIR SHUTOFF COOLING VALVE LPT CASE AIR DUCTS COOLING TURBINE VANE 2 PS3 AIR FILTERS COOLING AIR (TVCA) VALVE HSEE COOLING AIR TURBINE CASE VALVE ACTUATOR TURBINE CASE COOLING AIR VALVE CONTROL CABLE
SEE J SEE E
HPT CASE
COOLING
MANIFOLDS
1 HPT CASE AIR SHUTOFF VALVE COOLING COLLECTOR COOLING LPT CASE ENGINES WITHOUT PHASE 3 CHANGES COLLECTOR COOLING HPT CASE A COOLING AIR DUCT TURBINE BLADE FWD BLADE COOLING AIR (TVBCA) VALVE TURBINE VANE AND TVBCA VALVE POSITION SWITCH DSEE CSEE 1
2 ENGINES WITH PHASE 3 CHANGES
Figure 1 (Sheet 1) Turbine Cooling System Component Location
E71972
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SEE F
SEE B
TVBCA VALVE SEE C COOLING AIR DUCT TURBINE BLADE SEE G HPT CASE COOLING MANIFOLDS
TURBINE VANE COOLING LPT CASEAIR DUCTS COOLING MANIFOLDS
B
Turbine Cooling System Component Location
Figure 1 (Sheet 2)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
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