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• FLCHSPD
• G/S
• FLARE
• VNAV
• FD
• CMD
• LAND 2
• LAND 3
• TEST
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
4.10.16 D6-30151-425
Automatic Flight -
Controls and Indicators
Displayed (amber) –
• NO AUTOLAND
Autopilot Disengage Switch
1 Autopilot Disengage Switches
First push (either switch) –
• disengages all autopilots
• master warning lights illuminate
• displays the EICAS warning message AUTOPILOT DISC
• if A/P automatically disengages, resets master warning lights, EICAS
warning message, and aural warning
• sounds an aural warning different from all other aural warnings for a
minimum of one second
Second push – resets:
• master warning lights
• EICAS warning message
• auralwarning
1
CONTROL WHEELS
December 01, 1999
747 Operations Manual
Automatic Flight -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 4.10.17
Autothrottle Disconnect and TO/GA Switches
1 Takeoff/Go-around (TO/GA) Switch
On the ground:
Push –
• below 50 knots, activates autothrottle in THR REF mode at reference
thrust limit selected on THRUST LIMIT page
• between 50 knots and 400 feet altitude, A/T will not activate
• updates FMC position to runway landing threshold or position shift point
if GPS updating not active
In flight (after takeoff, until climb reference thrust limit active):
Push - removes takeoff derates.
In flight (flaps out of up or glideslope captured):
Push -
• selects TO/GA roll and pitch modes. If A/T armed, activates autothrottle
in THR mode
• second push selects THR REF autothrottle mode
Note: With no A/P or FD active and TO/GA armed for Go Around, pushing a
TO/GA switch displays FD, THR, TO/GA, and TO/GA on both PFDs.
Thrust adjusts to provide a 2000 feet per minute climb.
CONTROL STAND
2
1
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
4.10.18 D6-30151-425
Automatic Flight -
Controls and Indicators
2 Autothrottle Disconnect Switches
Push (either switch) –
• disconnects A/T
• illuminates master caution lights
• displays EICAS message AUTOTHROTTLE DISC
• if A/T automatically disconnects, resets master caution lights and EICAS
message
Second push - resets:
• master caution lights
• EICAScautionmessage
Autothrottle remains armed.
December 01, 1999
747 Operations Manual
Automatic Flight Chapter 4
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 4.20.1
Introduction
The automatic flight control system consists of the autopilot flight director system
(AFDS) and the autothrottle system (A/T). The mode control panel (MCP) and
flightmanagement computer (FMC) control the AFDS and the autothrottle system
to perform climb, cruise, descent, and approach.
Autopilot Flight Director System
The AFDS consists of three flight control computers (FCC) and the MCP.
The MCP provides control of the autopilot, flight director, altitude alert, and
autothrottle systems. The MCP selects and activates AFDS modes, and establishes
altitudes, speeds, and climb/descent profiles.
The three FCCs, left, center, and right, control separate hydraulically powered A/P
control servos to operate flight controls. The A/P controls ailerons and elevators.
Rudder commands are added only during a multi-A/P approach. Nose wheel
steering is also added during rollout from an automatic landing. During an ILS
approach with all three A/Ps engaged, separate electrical sources power the three
FCCs.
The FCCs also provide inputs for AFDS operating mode displays and FD
commands on the PFD.
MCP Switches
MCP switches select automatic flight control and flight director modes. A light in
the lower half of the switch illuminates PFD roll and pitch flight mode
annunciations to indicate the mode is armed or active. Autothrottle modes are
discussed later in this section.
Most modes activate with a single push. These modes include:
Other modes arm or activate with a single push. These modes are:
• flight level change (FLCH
SPD)
• heading hold (HDG HOLD)
• heading select (HDG SEL)
• vertical speed (V/S)
　
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