Smiths Aerospace
Electronic Systems – Malvern
BOEING B737-100/200/300/400/500
28-41-04
Page 127
April 19/02
DOC NO.0134ED
MAINTENANCE MANUAL SUPPLEMENT
Airplanes with Smiths 2307 Model Fuel Quantity
Indicators with TSU
EFFECTIVITY
THE TOTAL FUEL QUANTITY SHOWN ON THE CDU IS INACCURATE – Replace the FUEL PWR XFR
RLY, R309, in the P6 panel.
NOTE: Select FMCS sensor status page displays on the FMCS CDU (AMM 22-02-10/101).
FUEL SUM will say OK or FAIL. OK indicates fuel summation unit (FSU) is
able to send data to Digital to analog adapter (DAA). FAIL indicates one
or more of the signals to the DAA is not being received from the FSU.
IF-
NOT OK – Select HDG/STS on the IRS
Inertial System Display Unit (ISDU)
(AMM 34-28-01/101). If code 05 is
displayed replace left DAA
(AMM 34-28-41/401). IF-
OK – The system is OK.
NOT OK – Replace the Fuel Summation
Unit (AMM 28-41-81/401).
OK – The system is OK.
FMCS Total Fuel Error
Figure 113
