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derates from 5 percent to 15 percent, CLB 1 is selected. CLB 2 is selected for all
takeoff thrust reductions or derates greater than 15 percent. On the ground, the
pilots may override the automatic climb derate selection after the takeoff selection
is complete.
Fuel Monitoring
The FMC receives fuel data from the fuel quantity indicating system (FQIS) or
from manual entries. Fuel quantity values display on the PERF INIT page as
calculated (CALC), MANUAL, or SENSED. They also display on the
PROGRESS page as totalizer and calculated.
The FMC usually uses the calculated value for performance computations. Before
engine start, the calculated value is automatically set to agree with the FQIS value.
When the FMC receives a positive fuel flow signal at engine start, the calculated
value disconnects from the FQIS and decreases at the fuel flow rate.
During fuel jettison, the calculated value is set equal to the FQIS value.When fuel
jettison is completed, the calculated value disconnects from the FQIS and
decreases at the fuel flow rate. This fuel quantity value displays as CALC on the
PERF INIT page and as CALCULATED on the PROGRESS page.
If the flight crew inputs a fuel quantity, the line title changes to MANUAL. The
manual value replaces the FQIS value and is updated by the FMC using fuel flow
rate, the same as for the calculated value.
If fuel flow data becomes invalid after engine start, the calculated value is
considered invalid and the FMC uses FQIS quantity for performance
computations. In this case, fuel quantity displays as SENSED on the PERF INIT
page and as TOTALIZER on the PROGRESS page.
Fuel flow signals are also used to calculate the fuel used by the engines. FUEL
USED displays on PROGRESS page. It is reset to zero on the ground after engine
shutdown, and when the FMC receives a positive fuel flow at the next engine start.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.32.4 D6-30151-425
Flight Management, Navigation -
Flight Management Computer
The scratchpad message FUEL DISAGREE–PROG 2 displays if the FMC
calculates a large difference between the total sensed fuel quantity and calculated
value. The flight crew should select PROGRESS page 2, and select the fuel value
for the FMC to use for the remainder of flight.
The FMC continually estimates the fuel at the destination airport if the active route
is flown. FMC calculated fuel predictions are based on landing gear and flaps up
during climb, cruise, and descent. Any prolonged flight with landing gear and/or
flaps extended increases fuel required. The increased fuel consumption will not be
correctly displayed on the FMC fuel predictions pages. The CDU message
INSUFFICIENT FUEL displays if the estimate is less than the fuel reserve value
entered on the PERF INIT page.
Loss of FMC Electrical Power
The FMC must have continuous electrical power to operate. When the electrical
power is interrupted and returns, the FMC restarts.
After restart, performance data displayed on the PERF INIT page must be
reentered. The route previously in use may be available. If so, it must be activated.
If the route is not available, the route must be reentered.
Before activating LNAV, the FMC must be given guidance to the route. Selecting
the appropriate waypoint and performing a direct to or course intercept to the
waypoint enables LNAV activation.
FMC Failure
Single FMC Failure
After loss of a single FMC, a resynchronization may occur. The active route may
become inactive, the performance data may be lost, and LNAV and VNAV modes
may fail. To regain FMC operation, activate and execute the flight plan, enter the
necessary performance data, and select LNAV and VNAV.
Note: If the MENU page and the scratchpad message TIMEOUT - RESELECT
display, the FMC is no longer connected to the CDU. Use the <FMC
prompt on the MENU page to connect the CDU to the FMC.
On the ground, the scratchpad message SINGLE FMC OPERATION displays
after loss of either FMC.
In flight, the scratchpad message SINGLE FMC OPERATION displays on only
one CDU after loss of the FMC not selected on the FMC selector. The scratchpad
message TIMEOUT - RESELECT displays on the CDU with the operative FMC.
October 1, 2000
747 Operations Manual
Flight Management, Navigation -
Flight Management Computer
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.32.5
In flight, the scratchpad message TIMEOUT - RESELECT displays on both
CDUs after loss of the selected FMC. The FAIL light illuminates in all three
CDUs. The navigation display with the NAV source selector selected to the failed
　
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