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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Cruise
11.42.54 Boeing Proprietary
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787 Flight Crew Operations Manual
Flight Management, Navigation Chapter 11
FMC Descent and Approach Section 43
Boeing Proprietary 11.43.1
11.43 Flight Management, Navigation-FMC Descent and Approach Introduction
The descent phase starts at the top of descent point and continues to the end of
descent point. Planning for the descent phase starts during cruise.
The approach phase starts when the airplane is in the descent phase and flaps are
out of up. In general, the approach starts no later than sequencing the final
approach fix. For a detailed explanation of “on approach” refer to Chapter 11.31.
Alternates are available from preflight through approach phase of flight and can
be selected or updated at any time. Diversion to an alternate can be accomplished
during all phases of flight.
The only automatic page change in the descent/approach phases is the VNAV
selected page change from cruise to descent at the top of descent.
Early Descent
Early descents are discussed in Section 42, FMC Cruise.
Descent
During descent, LNAV is managed using the RTE LEGS and PROGRESS pages,
as in the cruise phase. VNAV descent management is accomplished primarily on
the DES page.
During descent, the specific page listed below is used to:
• DESCENT FORECAST page – enter forecast wind data to aid descent
planning
• OFFPATH DES page – analyze descent performance with and without the
use of speedbrakes
• ALTN page – manage the selection of alternate airports and diversions
Altitude Intervention
If an unplanned level-off is required, setting the altitude window to the required
altitude causes the airplane to level at the set altitude. VNAV PTH changes to
VNAV ALT. The descent can be continued by setting the altitude window to a
lower altitude and pushing the altitude selector. If the altitude window is set to an
altitude below other altitude constraints, each altitude constraint can be deleted by
each push of the altitude selector. Or, all waypoint altitude constraints between the
current airplane altitude and the altitude window setting can be deleted by
selection of the DES DIR> prompt on the DES page.
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
11.43.2 Boeing Proprietary
Descent Page
The descent page is used to monitor and revise the descent path. Descent speeds
are economy (ECON) and fixed speed (SEL). The default VNAV descent mode is
ECON. A fixed speed descent is flown when speed intervention is used or a speed
is entered on the DES page. The descent page is blank with DES as the title until
an altitude constraint below the cruise altitude is entered.
This page title includes the VNAV speed mode. The ECON mode controls descent
speed at the economy speed until reaching a lower speed restriction. The fixed
speed mode controls descent speed at the fixed speed until a lower speed
restriction is reached.
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DESCENT MODE
A T R U B E L
E C O N S P D
S P D T R A N S
SP D R E S T R FPAV/B V /S
W P T / A L T
FORECAST>
2.9 3.1 1754
NOLLA/ 2000
2800 PELLY 240/6000
.805/270
240/10000
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DES DIR>
3
LB 1 3
DES
ACT ECON C
ACT ECON CRZ
ACT ECON
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2 /
E / D A T
3/3
<OFFPATH DES
<OFFPATH DES DES NOW>
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VNAV
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787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Descent and Approach
Boeing Proprietary 11.43.3
The page title displays active (ACT) or modified (MOD) descent. Usually, the title
displays ECON for economy descent. Fixed speed descents modify the title.
The page title displays the type of descent:
• ECON – speed based on a cost index
• LIM SPD – speed based on airplane configuration limiting speed
• MCP SPD – MCP speed intervention is selected
• XXXKT – fixed CAS descent speed profile
• M.XXX – fixed Mach descent speed profile
• END OF DES – E/D AT waypoint reached if not followed by a climb
segment.
Fixed descent speeds are for:
• a flight crew entered selected speed (SEL SPD)
• a speed transition
• a speed restriction associated with an altitude constraint
　
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