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commands are added only during an autopilot approach and landing. The autopilot
controls nose wheel steering during rollout after an automatic landing.
Flight director information is displayed on the primary flight displays (PFDs) and
head-up displays (HUDs). Pilot MCP selections are sent to the autopilots.
Autopilot commands are sent to the Primary Flight Computers (PFCs) to generate
flight control surface commands. While autopilot(s) is engaged the pilot controls
are back driven to provide visual and tactile indications of automatic commands.
The PFCs sends backdrive commands to two of the ACEs which control the
backdrive actuators to move the column, wheel, and pedals. Autopilot rudder
commands are added only during an autopilot approach and landing.
MCP Mode Selection
MCP mode switches are used to select automatic flight control and flight director
modes. A light on the switch illuminates to indicate that the mode is armed or
engaged. Mode engagement is indicated by the PFD and HUD roll and pitch flight
mode annunciations. Autothrottle modes are discussed later in this section.
Most modes engage with a single push. These modes include:
787 Flight Crew Operations Manual
Automatic Flight -
System Description
4.20.2 Boeing Proprietary
Other modes arm or engage with a single push. These modes are:
All modes except APP can be disengaged by selecting another mode. All modes
can be disengaged by disconnecting the autopilot and turning both flight directors
off. After localizer and glideslope capture, the localizer and glideslope modes can
only be disengaged by disconnecting the autopilot and turning both flight directors
off, engaging the go–around mode, or if above 1,500 feet radio altitude, by
reselecting APP (roll and pitch will revert to default modes). The VNAV, LNAV,
LOC and APP modes can be disarmed by pushing the mode switch a second time.
(except when LNAV is automatically armed on go-around)
Desired target values can be selected on the MCP for:
All of these parameters except vertical speed and flight path angle can be
preselected prior to autopilot and/or flight director engagement.
Autopilot Engagement
The autopilot is engaged by pushing either of the two MCP autopilot engage
switches.
Autopilot Disengagement
Normal autopilot disengagement is through either control wheel autopilot
disconnect switch. The autopilots can also be disengaged by:
• the MCP autopilot disengage bar, or
• overriding with the control column, control wheel, or rudder pedals
(pedals will only disengage the autopilots with LAND 2 or LAND 3
annunciated).
• flight level change (FLCH
SPD)
• heading hold (HDG HOLD)
• track hold (TRK HOLD)
• heading select (HDG SEL)
• track select (TRK SEL)
• vertical speed (V/S)
• flight path angle (FPA)
• altitude hold (ALT).
• lateral navigation (LNAV)
• vertical navigation (VNAV)
• localizer / final approach
course (LOC/FAC)
• approach (APP).
• airspeed
• Mach
• heading
• track
• vertical speed
• flight path angle
• altitude.
787 Flight Crew Operations Manual
Automatic Flight -
System Description
Boeing Proprietary 4.20.3
An automatic autopilot disconnect occurs for some failures detected by the
autopilot. The EICAS warning message AUTOPILOT DISC is displayed if the
autopilot is manually or automatically disconnected. Depending upon the system
failure, it may be possible to re–engage an autopilot by pushing the autopilot
engage switch.
Autopilot and Flight Director Mode Degradations
Autopilot
The autopilot system can detect the degradation of a specific autopilot mode.
When an engaged mode degrades, the autopilot remains engaged in an attitude
stabilizing mode based on inertial data. If the degradation persists, the condition
is annunciated on the PFD and HUD line drawn through the affected flight mode
annunciation (amber line on the PFD). If the degradation continues, the EICAS
caution message AUTOPILOT is displayed to indicate the autopilot is operating
in a degraded mode. When the degradation is no longer present the annunciations
clear, the autopilot resumes using the mode, and a green box is drawn around the
affected flight mode annunciation on the PFD and HUD for 10 seconds.
Flight Director
When a specific flight director mode degrades, the flight director provides an
attitude stabilizing command based on inertial data. If the degradation persists, the
condition is annunciated by removal of the affected (pitch or roll) flight director
　
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