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• altitude hold (ALT)
• lateral navigation (LNAV)
• vertical navigation (VNAV)
• localizer (LOC)
• approach(APP)
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
4.20.2 D6-30151-425
Automatic Flight -
System Description
All modes deactivate by disengaging the autopilot and turning both flight directors
off. After localizer and glideslope capture, the localizer and glideslope modes can
only be deactivated by disengaging the autopilot and turning both flight directors
off or by selecting TO/GA mode. VNAV, LNAV, LOC, and APP modes can be
disarmed by pushing the mode switch a second time.
Desired target values can be selected on the MCP for:
All parameters except vertical speed can be preselected before autopilot and/or
flight director engagement.
Autopilot Engagement
The autopilot is engaged by pushing one of the MCP autopilot engage switches.
Autopilot Disengagement
Normal autopilot disengagement is through either control wheel autopilot
disengage switch. The autopilots can also be disengaged by the MCP autopilot
disengage bar. The EICAS warning message AUTOPILOT DISC displays when
the autopilot has been manually or automatically disengaged.
AFDS Failures
During autopilot operation, failures affecting the active mode annunciate on the
PFD. If the failure affects only the active mode:
• the autopilot remains engaged in an attitude stabilizing mode
• an amber line is drawn through the mode annunciation
• the EICAS caution message AUTOPILOT displays
Failures affecting all autopilot modes result in an autopilot disengagement
accompanied by an aural warning. Depending on the system failure, it may be
possible to reengage an autopilot by pushing the autopilot engage switch.
A flight director mode failure, in either pitch or roll, causes the related command
bar to disappear.
Flight Director Display
The flight director steering indications normally display any time the related
Flight Director switch is ON.
Pushing a TO/GA switch when airspeed is greater than 80 knots and the flaps are
out of up displays steering indications when the Flight Director switch(es) is OFF.
In this case, steering indications can be removed by cycling the flight director
switch(es) ON and OFF.
• airspeed
• Mach
• heading
• vertical speed
• altitude
December 01, 1999
747 Operations Manual
Automatic Flight -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 4.20.3
Autopilot Flight Director System Schematic
AFDS Status Annunciation
The following AFDS status annunciations display above the attitude display:
• FD - flight director ON and autopilots not engaged
• CMD - autopilot engaged
• LAND 3 - three autopilots engaged and operating normally for an
automatic landing
L
FCC
C
FCC
R
FCC
L HYD
SERVO
C HYD
SERVO
R HYD
SERVO
FD
BARS
HYD
FLIGHT CONTROL
ACTUATORS
FLIGHT CONTROL SURFACES
FMC
CDU
L NAV
V NAV
A/P ENGAGE
L
CMD CMD
DISENGAGE
C R
CMD
AFDS MCP
F/D
ON
OFF
F/D
ON
OFF
COMMAND
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
4.20.4 D6-30151-425
Automatic Flight -
System Description
• LAND 2 - AFDS redundancy reduced; in some cases, only two autopilots
available
• NO AUTOLAND - AFDS unable to make an automatic landing
With a LAND 3 indication, the autopilot system level of redundancy is such that
a single fault cannot prevent the autopilot system from making an automatic
landing (fail operational).
With a LAND 2 indication, the level of redundancy is such that a single fault
cannot cause a significant deviation from the flight path (fail passive).
An EICAS message displays for any fault limiting the capability of the automatic
landing system. Below 200 feet RA, a change from LAND 3 to LAND 2 is not
annunciated. Faults not requiring immediate crew action or awareness are
annunciated after touchdown.
AFDS Flight Mode Annunciations
Flight mode annunciations display above AFDS status annunciations. Mode
annunciations, from left to right, are:
• autothrottle
• roll
• pitch
Active modes display at the top of the flight mode annunciation boxes in large
green letters. Armed modes (except for TO/GA in flight) display in smaller white
　
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