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TO.
The ECON SPD, SPD TRANS, SPD RESTR, and DES data are the same as the
DES page.
1 Descend To (DES TO)
The waypoint for a direct–to descent. Usually, this is the E/D waypoint from the
DES page. DTG calculations are for a descent direct to the DES TO waypoint.
Valid entry is any navigation data base waypoint.
When within 150 feet of the DES TO waypoint altitude for a waypoint other than
the E/D waypoint, the display changes from DES TO waypoint to the E/D
waypoint from DES page.
2 Distance To Go (DTG)
Displays straight line distance to the entered waypoint.
1 0
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D I S P L A Y
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S P D R E S T R
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P EL LY
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8
DESCENT FORECAST XXXX DES
<OFFPATH DES <OFFPATH DES
1 3
6
7
2
4
5
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.43.8 D6-30151-425
Flight Management, Navigation -
FMC Descent and Approach
3 Speed/Altitude (SPD/ALT)
Displays the speed/altitude constraint from the E/D waypoint on the DES page or
from an entered active waypoint which has a speed/altitude constraint. Other
entries cause prompt boxes to display.
4 CLEAN CIRCLE
Displays distance to the clean descent circle. Distance is negative when a clean
descent is no longer possible.
A clean circle assumes no drag devices are used for descent.
A direct descent to the DES TO waypoint at a SPD/ALT constraint is possible
when the airplane is outside the clean circle.
5 DRAG CIRCLE
Displays distance to the drag descent circle. Distance is negative when a drag
descent is no longer possible.
A drag circle assumes speedbrakes are UP for descent.
A direct descent to the DES TO waypoint at a SPD/ALT constraint is possible
when the airplane is outside the drag circle.
6 FORECAST
PUSH - displays DESCENT FORECAST page.
7 DISPLAY SELECT ON, SELECT OFF
SELECT ON -
Push –
• displays CLEAN CIRCLE on ND
• displays DRAG CIRCLE on ND after aircraft inside CLEAN CIRCLE
SELECT OFF -
Push – removes clean and drag circles from the ND.
Engine Out Descent
There are no specific engine out pages for descent. Use the all-engine descent
planning features and pages.
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.43.9
Approach
During an ILS or LOC approach, roll and pitch modes change to approach
guidance supplied by navigation radios. The FMC continues to calculate and
display present position and can supply LNAV and VNAV approach guidance for
certain types of approaches when radio navigation is not used.
RTE LEGS and PROGRESS pages are used to manage the airplane until other
approach guidance becomes active.
During approach, the specific page listed below is used to:
• APPROACH REF page – specify approach flap settings and set the
approach VREF
• ARRIVALS page – select arrival and approach procedures
• HOLD page – manage holding patterns
Arrivals Page – IFR Approaches
The arrivals page allows selection of an approach, standard terminal arrival route
(STAR), and an arrival transition to the destination airport. This page can also be
used to view data about a selected airport that is not the destination. Route 1 and
route 2 have separate arrival pages.
Accessing the arrivals page less than 400 NM from the departure airport or less
than halfway along the active route, displays arrivals for the departure airport.
The approaches, STARS/profile descents, and transitions are displayed and
selected on this page.
Selecting Options
Selecting a runway, approach, approach transition, STAR/profile descent, or
descent transition option shows <SEL> inboard of the selection, and makes a route
modification. The other options within the same category are removed from the
list. When executing the modification, <SEL> changes to <ACT>. Selecting
another page and returning to ARRIVALS displays all options; the applicable
　
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