Boeing 757 Fuel Monitoring

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BOEING 757 PILOT TRAINING COURSE STEP BY STEP 


Fuel Monitoring
The FMC receives fuel data from the fuel quantity system or from manual entries. 
Fuel quantity values are shown on the PERF INIT page as calculated (CALC), 
MANUAL, or SENSED. They are shown on PROGRESS page 2 as TOTALIZER 
and CALCULATED. TOTALIZER and SENSED values are the same data with 
different names.
The FMC usually uses the calculated value for performance computations. Before 
engine start, the calculated value is set to agree with the fuel quantity indicating 
system value. When the FMC receives a positive fuel flow signal at engine start, 
the calculated value is independent of the fuel quantity system and decreases at the 
fuel flow rate.
The FMC will accept a manual entry of the fuel quantity on the PERF INIT page. 
If a manual fuel quantity is entered, the source of the fuel value on the PERF INIT 
page changes to MANUAL and the manual value then decreases at the fuel flow 
rate. When the fuel quantity calculations are based on a manual entry, the FUEL 
QUANTITY DISAGREE message is inhibited. Deleting a manual entry returns the fuel source on the PERF INIT page to CALC , and the fuel value then becomes the totalizer value at the instant the manual value was deleted, minus the fuel flow. 
The calculated value is invalid if fuel flow data is invalid. The FMC uses the fuel 
quantity indicating system quantity for performance computations. The line title 
on the PERF INIT page changes to SENSED and is shown as TOTALIZER on 
PROGRESS page 2. The fuel used by each engine is calculated with its related 
fuel flow signal. FUEL USED is also shown on PROGRESS page 2. 
Fuel used is reset to zero on the ground after flight when electrical power is 
removed or when the FMC receives a positive fuel flow at the next engine start.
The scratchpad shows the message FUEL DISAGREE–PROG 2 (or FUEL 
DISAGREE–PROG 2/2) if the FMC calculates a large difference between the 
total fuel value determined by the fuel quantity indicating system and the total fuel value calculated by the FMC. When the fuel disagree message appears, 
PROGRESS page 2 is used to select one of those two values for use by the FMC 
for its fuel calculations for the remainder of the flight. 
Note: The FUEL DISAGREE message is inhibited if the fuel quantity on the 
PERF INIT page is entered manually. Deleting a manual entry sets the fuel 
quantity back to the totalizer value, changes the line title back to CALC 
and enables the FUEL DISAGREE message. The FMC continually estimates the fuel at the destination airport if the active route 
is flown. The CDU message INSUFFICIENT FUEL is shown if the estimate is 
less than the fuel reserve value entered on the PERF INIT page.
Note: FMC calculated fuel predictions assume a clean configuration. Flight with 
gear or flaps extended cause fuel prediction errors. Fuel predictions are 
accurate after the gear and flaps are retracted.

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