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airspeed greater than 80 knots. The flight director PFD pitch bar and HUD
guidance cue indicates an initial pitch of eight degrees up.
787 Flight Crew Operations Manual
Automatic Flight -
System Description
4.20.8 Boeing Proprietary
After takeoff, the AFDS commands a pitch attitude to maintain:
• a target speed of V2 plus 15 knots
• if current airspeed remains above the target speed for 5 seconds, the target
airspeed is reset to current airspeed, to a maximum of V2 plus 25 knots
• the IAS/MACH window speed if the IAS/MACH window speed is
changed to a speed greater than the target speed.
Note: The AFDS uses the speed set in the IAS/MACH window prior to takeoff
for V2.
After the reference thrust limit changes from takeoff to climb, TO/GA arms
whenever flaps are out of up or at glideslope capture.
When a go–around is initiated, the commanded speed is the MCP IAS/MACH
window or current airspeed, whichever is higher, to a maximum of the
IAS/MACH window speed plus 25 knots. GA displays as the thrust limit on the
primary EICAS engine display.
VNAV –
VNAV is armed by pushing the VNAV switch (the switch bar is displayed and
VNAV is annunciated in small characters on the PFD (in white) and HUD pitch
mode annunciator below the current pitch mode).
VNAV engages above 400 feet after takeoff, if armed. VNAV engages in the
appropriate VNAV mode as required to maintain the current flight path:
• VNAV SPD (engaged) – The AFDS maintains the FMC speed displayed
on the PFD and HUD airspeed indicator and/or the CDU CLIMB or
DESCENT pages. If speed intervention is selected, the MCP IAS/MACH
selector is used to manually select the speed.
• VNAV PTH (engaged) – The AFDS maintains FMC altitude or descent
path with pitch commands. If the MCP altitude window is set to the
current cruise altitude as the airplane approaches the top of descent, the
CDU scratchpad message RESET MCP ALT displays.
• VNAV ALT (engaged) – When a conflict occurs between the VNAV
profile and the MCP altitude, the airplane levels and the pitch flight mode
annunciation becomes VNAV ALT. VNAV ALT maintains altitude. To
continue the climb or descent, change the MCP altitude and push the
altitude selector or change the pitch mode.
• If an early descent is desired, FLCH, V/S, or FPA may be selected to
descend below the VNAV descent path. If, during the decent, VNAV is
armed and the airplane descent path subsequently intercepts the VNAV
descent path, VNAV engages in VNAV PTH.
V/S (engaged) – Pushing the MCP VS/FPA switch, opens the vertical speed
window to display the current vertical speed. Pitch commands maintain the rate of
climb or descent selected in the VS/FPA window.
787 Flight Crew Operations Manual
Automatic Flight -
System Description
Boeing Proprietary 4.20.9
FPA (engaged) – Pushing the MCP VS/FPA switch opens the flight path angle
window to display the current flight path angle. Pitch commands maintain the
flight path angle selected in the VS/FPA window.
FLCH SPD (engaged) – Pushing the MCP FLCH switch opens IAS/MACH
window (if blanked). Pitch commands maintain IAS/MACH window airspeed or
Mach.
ALT (engaged) – Altitude hold mode is engaged by:
• pushing the MCP altitude HOLD switch, or
• capturing the selected altitude from a V/S, FPA, or FLCH climb or
descent.
G/S (engaged) – The AFDS follows the ILS glideslope.
G/P (engaged) – the AFDS follows the IAN glidepath.
FLARE (armed) – During an autoland, FLARE is displayed below 1500 feet RA.
FLARE (engaged) – During an autoland, flare engages between 60 and 40 feet
radio altitude. FLARE accomplishes the autoland flare maneuver so the AFDS
can transition to the ROLLOUT mode.
Autothrottle System
The autothrottle system provides automatic thrust control from takeoff through
landing.
Autothrottle operation is controlled from the MCP and the CDUs. The MCP
provides mode and speed selection. The CDU provides FMC thrust reference
mode selection. When the VNAV mode is selected, the FMC selects the
autothrottle modes and target thrust values. Refer to Chapter 11, Flight
Management, Navigation, for FMS and CDU operation.
The autothrottle can be operated without using the flight director or the autopilot.
In this condition, the autothrottle operates in either the THR REF, SPD, HOLD or
IDLE modes.
When the autothrottle is used during a manual landing, thrust reduces to IDLE at
25 feet radio altitude when the flight director is off or the pitch mode is V/S, FPA,
G/S, or any VNAV mode (VNAV SPD, VNAV PTH, or VNAV ALT). The
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787机组操作手册Flight Crew Operations Manual 2(5)
