Smiths Aerospace
Electronic Systems – Malvern
DOC NO.0134ED
MAINTENANCE MANUAL SUPPLEMENT
BOEING B737-100/200/300/400/500
28-41-04
Read the total fuel quantity from the VREF totalizer. The total fuel quantity shown must be equal to the
total of all the fuel quantity indicators with a tolerance of +/- 100 pounds (+/- 50 kilograms). Read the
flap reading and Landing Ref. Speed, and check that they are correct.
IF -
VREF totalizer is inoperative – FIG. 110
Total fuel quantity from the VREF totalizer is not equal to the
total of all the fuel quantity indicators with a tolerance of
+/- 100 pounds (+/- 50 kilograms) – FIG. 111
NOT OK
NOT OK
CONTINUE ON SHEET 6 FOR 2101 REFUEL INDICATOR
SHEET 7 FOR 2120 REFUEL INDICATOR
OK
Flap reading and/or Landing Ref. Speed reading from VREF
Totalizer is not correct – FIG. 112
NOT OK
Troubleshooting for the Fuel Quantity Indicating System - WITH VREF TOTALIZER
Figure 101 (Sheet 3)
Page 107
Dec 18/02
Airplanes with Smiths 2307 Model Fuel Quantity
Indicators with TSU
EFFECTIVITY