3. HPT Active Clearance Control Valve

__________________________________ (Ref. Fig. 003) The HPTACC valve has integrated dual butterfly valves driven by a single fuel powered actuator. Position feedback to the ECU is provided by a dual channel LVDT installed on the actuator. One butterfly valve controls the flow from 4th stage compressor bleed while the other butterfly valve controls the flow from the 9th stage compressor bleed. The 4th stage air is mixed with the 9th stage air downstream of the valve. The main valve modes are defined in the table that follows:
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 HPTACC - Schematic
 Figure 001

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 HPT Shroud Clearance Control System
 Figure 002

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 HPTACC Valve Figure 003 (SHEET 1)
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 HPTACC Valve Figure 003 (SHEET 2)
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 E E Feb 01/98 E E ECES E ---------------------------------------------------------------------------| Actuator | Mode | 4th Stage | 9th Stage | | Stroke | | Butterfly | Butterfly | |-------------------------------------------------------------------------| | 0 percent | No Air | Closed | Closed | | Failsafe | | | | |-----------------|---------------|-------------------|-------------------| | 22 percent | Full 9th | Closed | Fully open | |-----------------|---------------|-------------------|-------------------| | 42 percent | Regular 9th | Closed | Intermediate | |-----------------|---------------|-------------------|-------------------| | 42-100 percent | Mixed | Intermediate | Intermediate | |-----------------|---------------|-------------------|-------------------| | 100 percent | Full 4th | Fully open | Closed | ---------------------------------------------------------------------------

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 HPT ACTIVE CLEARANCE CONTROL VALVE - REMOVAL/INSTALLATION

_________________________________________________________
 TASK 75-21-10-000-002
 Removal of the High Pressure Turbine Active Clearance Control (HPTACC) Valve
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE  QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific blanking caps
 No specific blanking covers
 No specific blanking plugs

R  No specific circuit breaker(s) safety clip(s) No specific container 1 L (0.25 USgal) No specific soft-jawed pliers No specific warning notice
 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
R  24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
R External Power 71-13-00-010-040 Opening of the Fan Cowl Doors 78-30-00-481-041 Make the Thrust Reverser Unserviceable for Maintenance 78-36-00-010-040 Opening of the Thrust Reverser Doors 75-21-10-991-301 Fig. 401
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 3. Job Set-up
__________
 Subtask 75-21-10-941-053

 A. Safety Precautions
 (1) On the center pedestal, on the ENG panel 115VU:

 (a) Put a warning notice to tell persons not to start the engine.

 (2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.

 (3) On the overhead maintenance panel 50VU:

 (a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.

 (b) Put a warning notice to tell persons not to energize the FADEC

 1(2). R
R Subtask 75-21-10-861-053
R B. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
　
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