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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE E
SEE G
SEE F
FWD
L-A4447
SEE H
E
HPC Secondary Flow Control System Inspection
Figure 601 (Sheet 3)

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INTERMEDIATE CASE
HPC SECONDARY FLOW CONTROL VALVE RIGHT 2.9
AND IDG AIR/OIL HEAT EXCHANGERBLEED VALVE
VALVE OVERRIDE SOLENOID (REF)
PS3 AIR 
FILTER  FWD 
FWD 
G  VALVE OVERRIDE PRESSURE IDG AIR/OIL HEAT EXCHANGER 
SWITCH (REF) 
F 
VISUAL POSITION 
INDICATOR 
RIGHT HPC SECONDARY 
FLOW CONTROL VALVE 

H
FWD
HPC Secondary Flow Control System Inspection
Figure 601 (Sheet 4)

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 046-018-N00
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______
 OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF
 THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO
 EQUIPMENT.

 (2)  
Do this procedure: Thrust Reverser Deactivation for Ground
 Maintenance (AMM 78-31-00/201).

 S 016-014-N00

 (3)  
Open the core cowl panels (AMM 71-11-06/201).

 S 016-019-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU OPEN THE
_______
 THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS,
 INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

 (4)  
Open the thrust reversers (AMM 78-31-00/201).

 D.  
Examine the Control System of the HPC Secondary Flow

 S 216-003-N00
 (1)  
Visually examine the control valves for the HPC secondary flow.

 (a)  
Examine the control valves for correct installation.

 (b)  
If there is a loose control valve, tighten or replace the mounting bolt(s).

 (c)  
Examine the control valves for cracks.

 (d)  
If there are cracks found, replace the control valve(s) (AMM 75-33-01/401).

 (e)  
Examine the position of the visual position indicator pins on the control valves.

 (f)  
If the position indicator pin(s) is not fully extended, replace the control valve (AMM 75-33-01/401).

 S 216-004-N00
 (2)  
Visually examine the PS3 air filter (the control valve filter for
 the HPC secondary flow) assemblies for cracks and the correct
 installation.

 (a)  
No cracks are permitted.

 1)  Replace the filter assembly if there is a crack (AMM 75-33-02/401).

 (b)  
If there is a loose filter assembly, replace or tighten the mounting bolt(s).

 S 016-005-N00
 (3)  Remove the No. 7 segment of the fan exit liner (AMM 72-34-03/401) to get access to the control valve and valve solenoid of the turbine vane and blade cooling air.
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S 216-006-N00
 (4)  Visually examine the control valve and the valve solenoid for the
 turbine vane and blade cooling air.
　
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