49-94-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
SEE B
A
OIL
TEMPERATURE
SWITCH
SEQUENCING SWITCH FOR THE OIL PRESSURE SWITCH FOR THE LOW OIL PRESSURE FWD SWITCH FOR THE LOW OIL QUANTITY
B
Figure 1 (Sheet 1) APU Oil Indicating System Component Location
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49-94-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE C
SEE D
INDICATION OF LOW OIL PRESSURE
OFF OFF
ON ON GEN 1 APU GEN GEN 2 APU
LOW OIL OVER
1 2
PRESSURE SPEED
100 150
50 7
8
INDICATION
EXH AC
OF LOW OIL
6 QUANTITY
FLIGHT COMPARTMENT
AMPERES 2005
C X 100
40
TEMP
31
2
INDICATION OF HIGH OIL TEMPERATURE
FORWARD OVERHEAD PANEL, P5
C
HSI
VOR/
FIRE MASTER ILS
WARN CAUTION NAV
BELL CUTOUT PUSH TO RESET
FLT CONT
ELEC
IRS
APU
FUEL
OVHT/DET
MASTER CAUTION APU ANNUNCIATORLIGHT LIGHT
1 "LOW OIL QUANTITY" LIGHT OR "MAINT" LIGHT
PILOTS LIGHTSHIELD, P5
2"HIGH OIL TEMP" LIGHT OR "FAULT" LIGHT
D
APU Oil Indicating System Component Location
Figure 1 (Sheet 2)
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
4. LOW OIL QUANTITY or MAINT Light
_______________________________
A. The LOW OIL QUANTITY or MAINT light comes on when the oil quantity in the oil tank is less than 1-2 quarts (0.9-1.9 liters). The microswitch in the oil quantity switch sends the signal to the LOW OIL QUANTITY or MAINT light.
5. Low Oil Quantity Switch
________________________
A. The oil quantity switch has a tube, float and magnetic microswitch. The float controls the microswitch. When the oil quantity is less than 1-2 quarts (0.9-1.9 liters), the microswitch sends the signal for the low oil quantity. The oil quantity switch is found on the bottom of the oil tank.
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LOW OIL QUANTITY SWITCH - REMOVAL/INSTALLATION
______________________________________________
1. General
_______
A. This procedure contains the removal and installation tasks of the switch for the low oil quantity.
TASK 49-94-11-004-001
2. Low Oil Quantity Switch Removal (Fig. 401)
_______________________________
A. References
(1) AMM 49-91-31/301, Oil Tank
B. Access
(1)
Location Zones
101 Control Cabin, LH
205 Electronic Compartment
703 APU Compartment
(2)
Access Panels
1201 Electronic Equipment Access Door
3804 APU Cowl Door
C. Procedure
S 684-005
(1)
Drain the oil tank (AMM 49-91-31/301).
S 024-006
(2)
Remove the switch for the low oil quantity:
(a)
Disconnect the electrical plug from the receptacle and remove the receptacle from the bracket. 1) Remove the clamps that hold the wire sleeve to the
electrical conduit.
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