28-43-00
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A
737-300/400/500MAINTENANCE MANUAL
With power supplied to the system, do a check of the value on the fuel temperature indicator. IF -THE VALUE IS KNOWN TO BE INCORRECT.
Do a check for power and ground at the indicator. IF -OK - Install indicator that is known to NOT OK - Repair the wiring. operate correctly. IF -
OK - Replace the bad indicator.

Bulb Resistance Test (AMM 28-43-00/501). 501). Do this task: Fuel Temperature Indicating System Test (AMM 28-43-00/ OK - Do this task: Fuel Temperature IF -

NOT OK - Replace the temperature bulb. 

Fuel Temperature Indicating System - Troubleshooting
Figure 101

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737-300/400/500MAINTENANCE MANUAL
 FUEL TEMPERATURE INDICATING SYSTEM - ADJUSTMENT/TEST
____________________________________________________
 1.  General_______
 A.  This procedure has one task. The task is a test for the correct
 operation of the fuel temperature indicating system.

 B.  The procedure has these two parts:
 (1)  
A test of the fuel temperature bulb

 (2)  
A test of the fuel temperature indicator.

 C.  To do the test for the bulb, you measure the temperature at the bulb with a master thermometer. You then compare the value on the temperature indicator with the value on the master thermometer.
 D.  To do the test for the temperature indicator, you compare the value on the airplane temperature indicator with the value on a spare temperature indicator.
 TASK 28-43-00-715-001
 2.  Fuel Temperature Indicating System Test_______________________________________
 A.  Standard Tools and Equipment
 (1)  
Thermometer - Mercury Type, calibrated in °C, to compare with the temperature indicator

 (2)  
Indicator - temperature, spare, to compare with the airplane temperature indicator

 B.  References
 (1)  24-22-00/201 Manual Control
 C.  Access
 (1)  Location Zone
 101 Control Cabin Left
 102 Control Cabin Right
 310 Left Main Landing Gear

 D.  Procedure
 S 865-002
 (1)  
Connect external electrical power to the airplane
 (Ref 24-22-00/201).

 S 865-003

 (2)  
Make sure this circuit breaker is closed:

 (a)  P6 Main Power Distribution Panel 1) TEMP IND (for the fuel temperature indicating system)
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A 737-300/400/500MAINTENANCE MANUAL
 S 865-004
 (3)  Permit the temperature to become stable for 10 minutes.
 S 975-005
 (4)  Write the values shown on the airplane temperature indicator on the
 P5 panel.
 S 035-006
 (5)  Remove the fuel temperature bulb.
 NOTE: The fuel temperature bulb is on the aft side of the aft____
 spar. It is on the outboard side of the left main landing
 gear. It is immediately below the fuel shutoff valve for the
 APU.
 (a) Turn the locking cap for the temperature bulb to release the
 bulb from the pin.
 (b) Pull the bulb from the housing.
 S 975-007
 (6)  Measure the temperature in the bulb housing.
 (a) Put the thermometer in the bulb housing.
 (b) Permit the temperature to become stable.
 (c) Write the temperature shown on the thermometer.
 S 975-008
 (7)  Compare the value on the thermometer and the value on the fuel
 temperature indicator.
 (a) The two values must be the same with a tolerance of |4 °C.
　
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