787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Management, Navigation Chapter 11
FMC Descent and Approach Section 43
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 11.43.1
11.43 Flight Management, Navigation-FMC Descent and Approach
Flight Management, Navigation43 FMC Descent and ApproachFMC 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. (Refer to Approach
in Chapter 11, Section 31, for additional
information.)
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. (Refer to Early
Descent in Chapter 11, Section 31, for additional information.)
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.
February 15, 2010
To Next Page
Loading...
