787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Automatic Flight -
System Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 4.20.9
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.
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 or GLS glideslope.
G/P (engaged) – The AFDS follows the FMC 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 Vertical Navigation (VNAV)
in Chapter 11, Section 31, for additional information.)
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
autothrottle does not automatically retard if the pitch mode is TO/GA or FLCH.
With the autothrottle armed, the autothrottle automatically activates if:
• no autopilot or flight director active, or
• an autopilot or flight director is in VNAV XXX, FPA, ALT, V/S, or G/S
February 15, 2010
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