787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Management, Navigation -
FMC Takeoff and Climb
Copyright © The Boeing Company. See title page for details.
11.41.2 D615Z003-TBC
At the climb thrust reduction point, the FMC commands a reduction to the armed
climb thrust. Passing the transition altitude displayed on the SPD TRANS line,
VNAV commands an acceleration to the economy climb speed, which is
maintained until entering the cruise phase. Waypoint speed constraints take
priority, provided they are greater than VREF+80 or the transition speed.
During the climb, VNAV complies with the LEGS page waypoint altitude and
speed constraints. A temporary level–off for a crossing altitude restriction is
accomplished at the commanded speed. The commanded speed is magenta.
When the climb speed profile causes an anticipated violation of a waypoint
altitude constraint, the FMC displays the CDU help window message UNABLE
NEXT ALTITUDE. A different speed profile that gives a steeper climb angle must
be manually selected.
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 SPD changes to
VNAV ALT. The climb can be continued by setting the altitude window to a higher
altitude and pushing the altitude selector. If the altitude window is set to an altitude
above other altitude constraints, each altitude constraint can be deleted by each
push of the altitude selector. If cruise altitude is set in the altitude window, all
waypoint altitude climb constraints to the T/C can be deleted by selection of the
CLB DIR> prompt on the CLB page.
October 31, 2007
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