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The autopilot may be engaged after takeoff.
During preflight:
• with the autopilot disengaged and both Flight Director switches OFF,
activation of TO/GA roll and pitch mode occurs when the first Flight
Director switch is positioned ON
• PFD displays FD as AFDS status and TO/GA as the pitch and roll flight
mode annunciations
• pitch command is set to approximately eight degrees up
• roll command is wings level
April 01, 2001
747 Operations Manual
Automatic Flight -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 4.20.9
During takeoff prior to lift–off:
• with speed less than 50 KIAS, pushing a TO/GA switch activates the
autothrottle in thrust reference (THR REF) and advances Thrust levers to
the selected reference thrust limit. If the autothrottle is not engaged by 50
knots, it cannot be engaged until above 400 feet
• at 65 knots, autothrottle annunciation changes to HOLD
• during takeoff, the FMC records barometric altitude as the airplane
accelerates through 100 knots. This altitude is used to activate LNAV and
VNAV, enable autothrottle activation (if not active), command
acceleration for flap retraction, and set climb thrust if an altitude has been
selected
At lift–off:
• pitch command target speed is V2 + 10. If current airspeed remains above
target speed for 5 seconds, target airspeed is reset to current airspeed
(limited to a maximum of V2 + 25)
• roll command maintains ground track
After lift–off:
• if an engine failure occurs, the pitch command target speed is:
• V2, if airspeed is below V2
• existing speed, if airspeed is between V2 and V2 + 10
• V2 + 10, if airspeed is above V2 + 10
• if a TO/GA switch is pushed before the reference thrust limit changes to
climb:
• takeoff derates are removed
• autothrottle annunciation is THR REF
• at 50 feet, LNAV activates when armed. Roll commands bank to track the
active route
• at 400 feet, VNAV activates when armed. Pitch commands the current
airspeed. Autothrottle sets the selected reference thrust and annunciates
THR REF
• at acceleration height, pitch commands speed to 5 knots below takeoff
flap placard speed. As flaps are retracted, pitch commands an acceleration
to 5 knots below the placard speed of the commanded flap position
• When flaps are up, pitch commands an acceleration to VNAV climb
speed. VNAV climb speed is the greater of:
• 250 knots,
• VREF + 100 knots, or
• speed transition associated with origin airport
• at thrust reduction point (either an altitude or flaps 5), the FMC changes
the reference thrust limit to the armed climb limit (CLB, CLB 1, or CLB
2)
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
4.20.10 D6-30151-425
Automatic Flight -
System Description
TO/GA mode terminates by selecting any other pitch and roll mode, or by
activation of LNAV/VNAV modes
April 01, 2001
747 Operations Manual
Automatic Flight -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 4.20.11
Automatic Flight Takeoff Profile
Automatic Flight - Cruise
The autopilot and/or flight director can be used after takeoff to fly a lateral
navigation track (LNAV) and a vertical navigation track (VNAV) provided by the
FMC. Using LNAV and VNAV ensures the most economical operation.
Profile illustrations show the use of LNAV and VNAV.
Automatic Flight - Approach and Landing
The AFDS provides guidance for single or multiple autopilot precision
approaches.
Pushing the APP switch arms localizer in roll mode and glideslope in pitch mode.
Either localizer or glideslope can be captured first.
LNAV ACTIVE
VNAV ACTIVE
SWITCH PUSHED
A/P ENGAGE CMD
A/P ENGAGEMENT
FLAP RETRACTION
FMC COMMANDED FLAP
FMC COMMANDED THRUST
OR FLAPS 5)
ACCELERATION HEIGHT
ACCELERATE FOR
THR REF
REDUCTION POINT (HEIGHT
VNAV
65 KIAS
VNAV
LNAV
THRUST REDUCTION
LIMIT
TO ARMED CLIMB
SWITCHES
PUSH TO/GA
VNAV/LNAV ARMED
THROTTLE HOLD
HOLD
CMD
VNAV SPD
FD
TO/GA
FD
LNAV
FD
LNAV
TO/GA
TO/GA
VNAV
TO/GA
TO/GA
FD
HOLD
VNAV SPD
LNAV
THR REF LNAV
THR REF
400FT
50FT
April 01, 2001
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波音747-441操作手册1(100)
