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Oil Filter Differential Pressure Indicator (Fig. 1)
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 A.  The differential pressure indicator for the oil filter is designed to mechanically react to increasing pressure in the oil filter element due to filter contamination. When the pressure inside the oil filter element reaches a point when the oil filter element is clogged, a spring in the indicator compresses to trip a pop-up button. The normally-retracted pop-up button shows that the oil filter element is clogged and the oil filter element must be replaced. The location of the oil filter differential pressure indicator is on the oil sensor housing.
Operation
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 A.  The oil level sensor in the oil tank sends a continuous oil quantity signal to the APU controller. The oil temperature sensor and oil pressure switch, located downstream of the oil sensor housing, send oil indicating signals to the APU controller. A hydro-mechanical indicator, which senses high oil filter element pressure, has a visual pop-up button to show the oil filter element is clogged.
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A

747-400
MAINTENANCE MANUAL

BSEE APU COMPARTMENT  FWD  SEE  A  SEE  C 
SEE  D  FWD 
A 

SEE  E 
FWD 
B 

APU Oil Indicating System - Component Location

Figure 1 (Sheet 1)

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F59081
A
747-400 MAINTENANCE MANUAL
OIL LEVEL SENSOR
COVER FOR THE OIL FILTER ELEMENT 
OIL COOLER FUEL-COOLED  INDICATOR PRESSURE DIFFERENTIAL OIL FILTER 
FWD  C  D (VIEW IN THE AFT DIRECTION) 
OIL SENSOR HOUSING PRESSURE LOW OIL SWITCH 

OIL TEMPERATURE SENSOR
FWD
E
APU Oil Indicating System - Component Location
Figure 1 (Sheet 2)

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L77547
A
747-400 FAULT ISOLATION/MAINT MANUAL
APU OIL INDICATING SYSTEM

APU Oil Indicating System - Component Index
Figure 101

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E64686
A

747-400
FAULT ISOLATION/MAINT MANUAL

SEE A
FWD
SEE B
SEE C
APU COMPARTMENT
SEE D
FWD
A
SEE E
FWD
B
APU Oil Indicating System - Component Location
Figure 102 (Sheet 1)

L75486
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A
747-400 FAULT ISOLATION/MAINT MANUAL
OIL LEVEL
SENSOR

COVER FOR THE OIL FILTER ELEMENT
OIL FILTER
DIFFERENTIAL
FUEL-COOLED  PRESSURE
OIL COOLER INDICATOR
FWD
(VIEW IN THE AFT DIRECTION) C
D
OIL SENSOR
HOUSING
LOW OIL
PRESSURE
SWITCH
OIL
TEMPERATURE
　
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