(10) Monitor the value shown on the fuel temperature indicator.
(a) The pointer on the indicator must go back to its usual position at the bottom of the scale.
S 975-012
(11)
Write the value shown on the fuel temperature indicator.
S 035-013
(12)
Disconnect the electrical connector from the fuel temperature indicator on the airplane.
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737-300/400/500MAINTENANCE MANUAL
S 435-014
(13)
Connect the electrical connector to the spare fuel temperature indicator.
S 865-015
(14)
On the P6 panel, close the TEMP IND circuit breaker (for the fuel temperature indicating system)
S 975-016
(15)
Compare the value shown on the spare indicator with the value from the fuel temperature indicator that you wrote before this step.
(a) The values must be the same with a tolerance of | 5 °C.
S 865-017
(16)
On the P6 Panel, open the circuit breaker TEMP IND (for the fuel temperature indicating system).
S 035-018
(17)
Disconnect the spare fuel temperature indicator.
S 435-019
(18)
Connect the fuel temperature indicator for the airplane to the electrical connector.
S 865-020
(19)
On the P6 panel, close the circuit breaker TEMP IND (for the fuel temperature indicating system).
S 975-021
(20)
Make sure the value shown on the fuel temperature indicator is the same as it was before you did the test.
S 865-022
(21)
Remove the external power if it is not necessary for other tasks (Ref 24-22-00/201).
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737-300/400/500MAINTENANCE MANUAL
TASK 28-43-00-765-023
3. Fuel Temperature Bulb Resistance Test_____________________________________
A. Standard Tools and Equipment
(1)
Thermometer - Mercury Type, calibrated in °C, to compare with the temperature indicator
(2)
Ohmmeter
B. References
(1) WDM 28-42-01
C. Access
(1) Location Zones
101 Control Cabin Left
102 Control Cabin Right
310 Left Main Landing Gear
D. Procedure
S 865-024
(1) Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a) P6 Main Power Distribution Panel 1) TEMP IND (for the fuel temperature indicating system)
S 035-025
(2) Do these steps to 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 975-026
(3) 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 035-027
(4)
Disconnect the connector, D616, from the fuel temperature indicator in the flight compartment (WDM 28-42-01).
S 035-028
(5)
Disconnect the ground GD2674-DC on the A leg of the temperature sensor wiring (WDM 28-42-01).
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