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Entry:
• is optional for preflight completion
• is a height from 400 to 9999 feet, or
• 1 for flaps 1 and 5 for flaps 5 (entry of 5 when FLAPS 5 is specified as the
takeoff flap setting displays the CDU help window message INVALID
ENTRY).
If a manual entry creates a situation in which thrust reduction and takeoff flaps are
the same, the takeoff flap entry is automatically deleted and the CDU help window
message TAKEOFF FLAPS DELETED is displayed.
Displays takeoff gross weight limit for the uplinked data. Manual entry not
allowed.
Prefix ALT or STD is added to line title when alternate or standard takeoff data is
pending.
A temperature value entered in this field is downlinked with other takeoff data if
the takeoff data <REQUEST prompt on TAKEOFF REF 1/2 is selected.
Crew entry results in display of the CDU help window message TAKEOFF
SPEEDS DELETED.
Flight crew entered or uplinked data entry.
Valid entries are -54 to 99 degrees C or -65 to 199 degrees F.
Entry is optional for preflight completion.
7 Acceleration Height (ACCEL HT)
8 Climb Thrust and Thrust Reduction (THR REDUCTION) Altitude
9 Limit Takeoff Gross Weight (LIM TOGW)
10 Reference Outside Air Temperature (REF OAT)
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Preflight
11.40.46 Boeing Proprietary
Intentionally
Blank
787 Flight Crew Operations Manual
Flight Management, Navigation Chapter 11
FMC Takeoff and Climb Section 41
Boeing Proprietary 11.41.1
11.41 Flight Management, Navigation-FMC Takeoff and Climb Introduction
The FMC takeoff phase starts with the selection of takeoff/go–around (TO/GA).
Preparation for this phase starts in the preflight phase and includes entry of the
TAKEOFF REF page data.
The takeoff phase changes to the climb phase when the FMC commands climb
thrust. The climb phase continues to the top of climb point, where the cruise phase
starts.
During takeoff and climb, the specific page listed below is used to:
• TAKEOFF REF page – make last minute changes to the departure runway
• DEPARTURES page – make last minute changes to the SID
• CLIMB page – modify climb parameters and monitor airplane climb
performance
• RTE X LEGS page – modify the route and monitor route progress
• PROGRESS page – monitor the overall progress of the flight
• THRUST LIM page – select alternate climb thrust limits
• DEP/ARR INDEX page – select an approach during a turn–back.
Takeoff
When changes are made to the departure runway and SID, the TAKEOFF REF
and DEPARTURES pages must be modified to agree. The modified data are
entered the same as during preflight.
With correct takeoff parameters, the FMC commands the selected takeoff thrust
when the TO/GA switch is pushed. During the takeoff roll, the autothrottle
commands the thrust and the FMC commands acceleration to between V2+15 and
V2+25 knots, based on rate of rotation.
Usually, VNAV is armed before takeoff. When armed before takeoff, LNAV
activates at 50 feet radio altitude and commands roll to fly the active route leg.
VNAV activates at 400 feet above runway elevation and commands pitch to fly
the climb profile.
787 Flight Crew Operations Manual
Flight Management, Navigation -
FMC Takeoff and Climb
11.41.2 Boeing Proprietary
Climb
At acceleration height or the first movement of the flap handle during flap
retraction, VNAV commands acceleration to:
• 250 knots
• VREF+80 knots, or
• speed transition associated with the origin airport, whichever is greater.
The VNAV commanded speed is limited by the airplane configuration. At
acceleration height, VNAV commands a speed 5 knots below the flap placard
speed, based on flap handle position.
At the climb thrust reduction point, the FMC commands a reduction to the armed
climb thrust. Passing 10,000 feet, 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 250 knots.
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
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787机组操作手册Flight Crew Operations Manual 3(56)
