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Entry of a value after takeoff speeds are selected deletes V speeds and displays the
scratchpad message TAKEOFF SPEEDS DELETED.
The following displays indicate operative or inoperative weight and balance
(WBS):
• “GR WT ADV” and careted gross weight for operational WBS
• “GR WT” and prompt boxes for failure of WBS computer
T
.
.
R
Z
PERF INIT 1 / 1
G R W T C R Z A L
F U E L
.
F W
C O S T I N D E X
< IN EX
- -- --- -- --- --- -- --- -- ---
D
E S E R V E S
>
160 C A L C
S T E P S I Z E
I C A O
T HR U S T L I M
2 0 . 0 %
C R Z C G
REF
INIT
POS
ENTERED
SET IRS
GROUND,
ON
<PERF
INIT/REF INDEX
ACT RTE 1
PERF INIT>
0
A D V
< 3 7 0 . 0
2 1 0 0
2
3
4
5
6
7
8
9
10
1
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.40.28 D6-30151-425
Flight Management, Navigation -
FMC Preflight
The FMC gross weight calculated using WBS inputs displays in small font with a
caret. Line selection or pilot entry of gross weight changes display to large font
with WBS/FMC computed gross weight displayed in small font.
2 FUEL
Fuel on board displays when fuel totalizer calculations are valid. The source for
the display is included in the line:
• SENSED - fuel quantity is from the totalizer. Manual entry is not possible
• CALC (calculated) - fuel quantity is from FMC calculations. Manual
entry is possible
• MANUAL - fuel quantity has been manually entered. Manual entries
blank totalizer on PROGRESS page 2/3
Definitions of SENSED and CALC are found on PROGRESS page 2/3 in Section
42, FMC Cruise.
Valid entry is XXX or XXX.X.
Only manual entries can be deleted.
3 Zero Fuel Weight (ZFW)
Normally, ZFW is entered from the airplane dispatch papers and the FMC
calculates the airplane gross weight.
Valid entry is XXX or XXX.X.
Calculated zero fuel weight displays when airplane gross weight is entered first
and fuel on board is valid.
Entry of a value after takeoff speeds are selected deletes V speeds and displays the
scratchpad message TAKEOFF SPEEDS DELETED.
ZFW can be manually entered or uplinked. When a performance uplink is
pending, uplinked values (small font) display beside the entered values (large
font).
4 RESERVES
Valid entry is XXX or XXX.X.
Can be manually entered or uplinked. When a performance uplink is pending,
uplinked values (small font) display beside the entered values (large font).
5 COST INDEX
Cost index is used to calculate ECON climb, cruise, and descent speeds. Larger
values increase ECON speeds. Entering zero results in maximum range airspeed
and minimum trip fuel. Cost index can be entered by the flight crew or from a
company route.
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Preflight
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.40.29
Cost index can also be entered by uplink.
Valid entries are 0 to 9999.
6 INDEX
Push – displays the INIT/REF INDEX page.
7 Cruise Altitude (CRZ ALT)
Cruise altitude can be entered by the flight crew or from a company route.
Cruise altitude can also be entered by uplink.
Valid entry is XXX, XXXX, XXXXX, or FLXXX.
Altitude displays in feet or flight level depending on transition altitude.
Entry displays this cruise altitude on the CLB and CRZ pages.
8 Cruise Center of Gravity (CRZ CG)
Used by FMC to calculate maximum altitude and maneuver margin to buffet.
Displays default center of gravity.
Default value displays in small font.
A flight crew entered value displays in large font.
An uplinked value displays in large font.
Valid entry is XX.X.
9 STEP SIZE
Displays climb altitude increment used for planning the optimum climb profile.
Default display is ICAO.
Valid entries are 0 to 9000 in 1000 foot increments.
For a non–zero entry or ICAO, performance predictions are based on step climbs
at calculated step climb points. For a zero entry, performance predictions are based
on a constant CRZ ALT.
10 Thrust Limit (THRUST LIM)
Push – displays THRUST LIM page.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.40.30 D6-30151-425
Flight Management, Navigation -
FMC Preflight
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