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 B.  The PS3 air filters clean 15th-stage air prior to delivery to the HPC secondary flow control valve and TVBCA valve solenoid, the HPC secondary flow control valve and IDG air/oil heat exchanger valve override solenoid, and/or the 2.9 bleed valve solenoid and stability pneumatic relay valve; or muscle air (servo pressure) from the solenoids to the HPC secondary flow control valves.
 C.  Two filters are found at the 1:30 o'clock position and two filters are found at the 11 o'clock position on the HPC forward case.
 D.  The upper filter at the 1:30 o'clock position cleans 15th-stage air (servo pressure) before it is supplied to the HPC secondary flow control valve and IDG air/oil heat exchanger valve override solenoid, and to the
 2.9 bleed valve solenoid and stability bleed pneumatic relay valve.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
INTERMEDIATE CASE
IDG AIR/OIL HEAT EXCHANGER VALVE OVERRIDE SOLENOID (REF)
RIGHT HPC  SEE  B 
SECONDARY FLOW 
CONTROL VALVE  SEE  C  SEE  A 
SOLENOID 

IDG AIR/OIL HEAT EXCHANGER FWD VALVE OVERRIDE RIGHT
PRESSURE SWITCH (START)(REF) 2.9 BLEED
HPC SECONDARY FLOW CONTROL VALVE
VALVE
AND IDG AIR/OIL HEAT EXCHANGER (REF) VALVE OVERRIDE SOLENOID
A
RIGHT HPC SECONDARY FLOW CONTROL VALVE
FWD
PS3 AIR FILTER (RIGHT HPC SECONDARY PS3 AIR FILTER FLOW CONTROL (RIGHT HPC SECONDARY VALVE FILTER) FLOW CONTROL VALVE
AND 2.9 BLEED VALVE FILTER)
B
FWD
FUEL FLOW TRANSMITTER (REF)
C
HPC Secondary Flow Control System Component Location
Figure 1 (Sheet 1)

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LEFT HPC SECONDARY FLOW CONTROL VALVE SOLENOID 
INTERMEDIATE CASE 
SEE  F 
SEE  D  SEE  E 
PNEUMATIC MANIFOLD (REF)  TURBINE VANE AND BLADE COOLING AIR VALVE SOLENOID (REF)  FWD 
HPC SECONDARY FLOW CONTROL VALVE AND TURBINE VANE AND BLADE COOLING AIR VALVE SOLENOID 
D 
FUEL/OIL COOLER (REF) LEFT HPC SECONDARY FLOW CONTROL VALVE  E  FWD  FWD  PS3 AIR FILTER PS3 AIR FILTER COOLING AIR SECONDARY FLOW CONTROL VALVE VANE AND BLADE VALVE (LEFT HPC FILTER) FILTER) (TURBINE 
LEFT (STABILITY) 2.9 BLEED VALVE (REF) 
F 

HPC Secondary Flow Control System Component Location
Figure 1 (Sheet 2)

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E.  The lower filter at the 1:30 o'clock position cleans muscle air (servo pressure) from the HPC secondary flow control valve and IDG air/oil heat exchanger valve override solenoid before it goes into the right HPC secondary flow control valve.
 F.  The upper filter at the 11 o'clock position cleans muscle air (servo pressure) from the HPC secondary flow control valve and TVBCA valve solenoid before it goes into the TVBCA valves.
 G.  The lower filter at the 11 o'clock position cleans muscle air (servo pressure) from the HPC secondary flow control valve and TVBCA valve solenoid before it goes into the left HPC secondary flow control valve.
 H.  Each PS3 air filter assembly includes a filter head, element, and case. A poppet type bypass valve, integral with the filter head, opens at a filter differential pressure of 5 psid (34.5 kPad) and vents muscle air.
 4.  HPC Secondary Flow Control Valve Solenoids (Fig. 1)
　
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