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3.  Fuel Temperature Indicator
A.  The fuel temperature indicator, located on the forward overhead panel in the control cab, is a resistance ratiometer instrument. The indicator is operated by the ratio of the currents through two coils in the meter movement. One of these currents is determined by the resistance o f the temperature bulb. The indicator dial is calibrated in degrees centigrade and reads from -56 to +56°C. (See figure 2.) With power off, the pointer remains off scale at the low temperature end. Electrical connections are made to the indicator through a disconnect plug.

500  Fuel Temperature Indicating System Circuit 
Nov 15/67  Figure 1  28-43-0 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Fuel Temperature Indicating System Equipment Location  500 
28-43-0  Figure 2  Nov 15/67 
Page 2 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500 
Nov 15/67  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-43-0 Page 101 

FUEL TEMPERATURE INDICATING SYSTEM - ADJUSTMENT/TEST
1.  Fuel Temperature Indicating System Test
A.  General
(1)  Testing the fuel temperature indicating system consists of two parts: testing the fuel temperature bulb and testing the fuel temperature indicator. This is done for the bulb by establishing a temperature at the fuel temperature bulb, measuring the temperature with a master thermometer and comparing the reading of the fuel temperature indicator with the master thermometer and for the indicator by comparing the reading of the airplane temperature indicator with a spare indicator.
B.  Equipment and Materials
(1)  
Master Thermometer - Mercury Type, calibrated in degrees centigrade

(2)  
Spare Temperature Indicator

(3)  
Oil or water bath if conditions require tests beyond ambient temperature

C.  Prepare Fuel Temperature Indicating System for Test
(1)  
Connect external power to airplane (Ref Chapter 24, 49).

(2)  
Close TEMP IND circuit breaker on aft overhead panel (P6). Allow 10 minutes for system to stabilize.

D.  Test Fuel Temperature Bulb
(1)  
Record indication of airplane indicator on forward overhead panel.

(2)  
Rotate temperature bulb locking cap to free bulb from pin and pul1 bulb out of housing.

NOTE:  The fuel temperature bulb is located on the aft side of the aft spar, outboard of the left main landing gear, and directly below the APU fuel shutoff valve.

(3)  
Place master thermometer in bulb housing and allow temperature to stabilize. Record temperature reading.

(4)  
Compare readings of master thermometer and fuel temperature indicator. They should agree within + 4°C.

(5)  
Replace fuel temperature bulb.

500 
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E.  Test Fuel Temperature Indicator
(1)  
Read indication on airplane indicator on third crewman's lower instrument panel.

(2)  
Open IND-TEMP circuit breaker and observe indicator reading. Indicator needle should return to normal down scale position.

(3)  
Remove electrical connector from airplane indicator and connect it to spare indicator. Temperature readings of airplane indicator and spare indicator should correspond within 

+ 5°C.

(4)
Remove electrical connector from spare indicator and install on airplane indicator.

F.  Restore Airplane to Normal
(1)  
Close IND-TEMP circuit breaker.

(2)  
If no further requirement exists for external power, disconnect external power from airplane.

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FUEL TEMPERATURE BULB - REMOVAL/INSTALLATION
1. Prepare Fuel Temperature Bulb for Removal
A. Open IND-TEMP circuit breaker on panel P6-3.
B. Cut fuel temperature bulb leads.
NOTE:  The fuel temperature bulb is located on the aft side of the aft spar, outboard of the left main landing gear, and directly below the APU shutoff valve.
2. Equipment and Materials
A. Silicone Grease - No. 4 (Dow Corning)
3. Remove Fuel Temperature Bulb (Fig. 401)
A. Rotate temperature bulb locking cap to free bulb from pin.
B. Hold locking cap and pull bulb out of bulb housing.
4. Install Fuel Temperature Bulb (Fig. 401)
　
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