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 NOTE: Boeing 737-SL-31-032 advises of two Smiths Component Service
____ Bulletins to correct an engine oil quantity input value caused by DC voltage to the EIS input.
 4.  Operation (Fig. 2)
_________
 A.  AIRPLANES WITH OIL TEMPERATURE INDICATORS;
 (AIRPLANES WITHOUT THE ENGINE INSTRUMENT SYSTEM (EIS));
 Refer to the data that follows:

 (1)  
115 volts ac power is supplied to the oil quantity indicating system from the P6-2 circuit breaker panel. Indicator lighting is 5 volts ac.

 (2)  
The oil quantity transmitter acts as a variable capacitor. The level of oil in the transmitter tube establishes a dielectric value between the inner and outer tube. The dielectric value between the tubes determines the capacitance and establishes an indicator bridge signal. The compensator probe measures the dielectric constant of the oil such that the capacitance is independant of temperature or the type of oil used.

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 79-31-00
 ALL  ú ú C02 Page 1 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE  A 
ANTI-SIPHON
VENT TUBE  TUBE 
LUBE 
SCAVENGE 
TUBE 
ELECTRICAL 
CONNECTOR 
LUBE 
SUPPLY 
TUBE 
OIL 
QUANTITY 
TRANSMITTER 

OIL TANK
FWD  SCUPPER DRAIN TUBE
A
Oil Quantity Indicating System - Component Location Figure 1 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 79-31-00
 ALL  ú ú C01 Page 2 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE B TAT
`C OIL QUANTITY
ENG
INDICATORS OIL PRESS PSI
100 100 50 50 00
0 0
OIL OIL
QUANTITYQUANTITY

OIL
4 4
TEMP 11
`C GALLONS GALLONS
200 200
100 100
3 3
2 2
00
OIL QTY %FULL
PILOTS CENTER INSTRUMENT PANEL PILOTS CENTER INSTRUMENT PANEL
B1 B2
1 AIRPLANES WITH OIL QUANTITY INDICATORS 2  AIRPLANES WITH SECONDARY ENGINE AND HYDRAULICS DISPLAY UNIT
Oil Quantity Indicating System Component Location
Figure 1 (Sheet 2)

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 79-31-00
 ALL  ú ú C02 Page 3 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////

P2 CENTER INSTRUMENT PANEL

1
AIRPLANES WITH OIL SYSTEM PARAMETERS
INPUT TO DIGITAL FLIGHT RECORDER SYSTEM

Oil Quantity Indicating System Schematic Figure 2 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANES WITH OIL QUANTITY ú 79-31-00
 INDICATORS  ú
 ú C02 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 4Nov 12/00 

////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////

D10102 ENGINE 2 D3034
3

D1016 D404 D682 2 232
6
1  371

3
ENGINE 1
D10100 3
D1014
SAME AS 6
ENGINE 2
3

24 ENGINE 1
N183 SECONDARY ENGINE
AND HYDRAULICS DISPLAY

P2 CENTER INSTRUMENT PANEL
Oil Quantity Indicating System Schematic
Figure 2 (Sheet 2)
　
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