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Operation (Fig. 2)
_________
 A.  High pressure oil flows from the pressure regulating valve into the FCOC which is mounted on the oil filter assembly. Primary cooling of the lubricating oil is carried out by the FCOC which transfers as much heat as possible from the oil to the incoming fuel. A bypass valve is fitted in the oil stream to limit maximum oil pressure drop through the cooler. The pressure oil from the FCOC flows through external tubing to the ACOC. The ACOC is mounted on top of the load gearbox and provides secondary cooling for the lubricating oil. Heat from the oil is transferred to air from the cooling fan. A thermal/pressure relief valve is fitted integrally with the ACOC oil inlet/outlet duct.
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A

747-400
MAINTENANCE MANUAL

SEE A
FWD
APU COMPARTMENT
AIR-COOLED OIL COOLER
COOLING AIR
OUTLET DUCT

FWD
A
APU Oil External Distribution System - Component Location
Figure 1 (Sheet 1)

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L76706
A

747-400
MAINTENANCE MANUAL

FWD
SEE B

APU COMPARTMENT
FWD
SEE C
B
OIL SENSOR
HOUSING

FUEL-COOLED OIL COOLER FWD
C
APU Oil External Distribution System - Component Location
Figure 1 (Sheet 2)

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L76763
A
747-400
MAINTENANCE MANUAL

1 
SHT 2 
2 
3 
4  SHT 2 
5 
SCREEN 
CHIP 
DETECTOR 

6 
7 
THERMAL/PRESSURE 
BYPASS VALVE 
8 
9  SHT 2 
AIR-COOLED  10 
OIL COOLER 
LEGEND:______ 
BYPASS OIL 
11 
PRESSURE OIL 
SCAVENGE OIL 
APU Oil System Schematic 
Figure 2 (Sheet 1) 

M33441
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A
747-400
MAINTENANCE MANUAL

1
SHT 1
2
3
SHT 1 4
5
NO. 0
BEARING
TRANSFER
BLOCK
CENTRIFUGAL IMPELLER
COLD PRESSURE RELIEF VALVE
6
7
8
SHT 1 9
10
11
NO. 1 BEARING
OIL TANK
PUMP
PT
OIL FILTER ELEMENT
NO. 2 NO. 3
NO. 4
BEARING BEARING
BEARING
OIL 
VENT 
CHIP 
DETECTOR 
VALVE REGULATING PRESSURE  OIL COOLER FUEL-COOLED 
CHECK 
VALVE 
BYPASS 
PRESSURE  VALVE 
SENSE LINE 
OIL FILTER 
DIFFERENTIAL 
PRESSURE INDICATOR 
LOAD GEARBOX 
SCAVENGE PUMP 
APU GEARBOX 
SCAVENGE PUMP 
NO. 4 BEARING 
SCAVENGE PUMP 

APU Oil System Schematic
Figure 2 (Sheet 2)

M32438
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