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December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Cruise
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.42.19
4 Direction and Speed (DIR/SPD)
Displays dashes after altitude/flight level entered in the ALT line.
Valid entries are wind direction and speed.
Displays wind direction and speed for related altitude.
Manual entries display in large font.
Values propagate in both directions for the first wind entered and downtrack for
other entered winds. Propagated values display in small font.
5 Altitude/Outside Air Temperature (ALT/OAT)
Valid entries are altitude or flight level/andOAT.
OATs display in OAT column.
The altitude for OAT does not have to be one of the wind altitudes. The FMC uses
standard lapse rate to calculate and display the temperature at the other altitudes.
6 Route Data (RTE DATA)
Push – displays RTE DATA page.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.42.20 D6-30151-425
Flight Management, Navigation -
FMC Cruise
Position Reference Page 2/3
Position reference page 2 displays the position and ground speed calculated by the
FMC and IRS.
GPS position updating can be enabled and inhibited and radio and GPS updates to
the FMC position can be purged on this page. The IRS position can be changed to
bearing/distance.
1 FMC Position (POS)
Displays the FMC calculated latitude/longitude position.
POS R EF 2 /
F M C G S
N 4 K T
I R
N K T
< IN DEX >
0
4
.
< PU RGE
3
P O S ( G P S L )
S ( 3 )
4
4 3
2 6
R N P / A C T U A L
2 . 0 /0 0 5 N M
- -- --- --- -- --- -- G P S N A V
B R G / D I S T
I N H I B I T >
0
7`01. W1 20`27.4
7`01.4 W120`27.4
5
INIT/REF INDEX
<POS
POS REF>
PROGRESS 1/3
POS INIT 1/3
IN ATT
NO IRU
IN AIR,
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December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Cruise
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.42.21
Line title identifies the source for calculating the FMC position:
• GPS L, GPS R – FMC calculates position using GPS data
• RADIO – FMC calculates position using navigation radio data
• LOC-GPSL, LOC-GPSR - FMC calculates position using localizer and
GPS data
• LOC-DD - FMC calculates position using localizer and DME data
• LOC-VD - FMC calculates position using localizer, VOR, and DME data
• LOC - FMC calculates position using localizer data
Displays IRS (X) position when CONFIRM displayed in purge line; becomes
active FMC position if purge is confirmed.
2 IRS
Displays the IRS latitude/longitude position.
Following selection of BRG/DIST, displays bearing/distance of IRS position from
FMC position.
Blank when FMC receiving no valid IRU data.
3 Required Navigation Performance and Actual Navigation Performance
(RNP /ACTUAL)
Displays the RNP and actual navigational performance (ACTUAL) of the FMC.
Displays IRS (X) position accuracy when CONFIRM displayed in purge line.
Default RNP is in small font. Manual RNP entry displays in large font. Deletion
of manual entry returns display to default RNP.
Valid RNP entries are in the range 0.01 to 99.9.ACTUAL entry not allowed.
Note: The FMC stops GPS updates if the GPS ACTUAL is twice the RNP. This
occurs if the GPS ACTUAL has increased or the flight crew inputs a small
RNP value. Subsequently, the FMC changes updates to another system.
4 PURGE
Push -
• displays mixed IRS position on the FMC POS line. Line title displays
PURGE and data line displays CONFIRM
• selection of CONFIRM replaces FMC position with mixed IRS position.
FMC resumes radio updating when valid stations available. Line title
blanks and PURGE prompt displays
Leaving this page on both CDUs with CONFIRM displayed returns the initial
display.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.42.22 D6-30151-425
Flight Management, Navigation -
FMC Cruise
5 INDEX
Push – displays INIT/REF INDEX page.
6 Ground Speed (GS)
Displays ground speed associated with FMC POS and IRS (X).
Blank from power application until IRU enters navigation mode.
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