Take the auto throttle cannot change thrust leaver position

Take off mode is engaged by pressing either of the takeoff go-around
switches on the throttles, with the aeroplane on the ground the auto throttles
armed and the desired n1 thrust limit selected

from the flight management system computer display unit. the auto
throttle enunciation changes from armed to n1 and the thrust levers advance
toward takeoff thrust. the auto throttle sets the computed n1 value. between 60
to 80 knots the auto throttle enunciation changes to throttle hold. to indicate
the auto throttle cannot change thrust leaver position although they can still
be repositioned manually. after takeoff the auto throttles remain in throttle
hold. until 400 feet radio altitude is reached and 18 seconds have elapsed
since lift off.  auto throttle
enunciation then changes from throttle hold to arm.

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reduction to climb thrust can now be made by pressing the N 1 switch.
flexible takeoff or takeoff legs is a facility to allow the auto throttle to
calculate and provide a reduced thrust takeoff by entering an assumed
temperature into the flight management system or the thrust mode limit panel. the
autothrottle maintains thrust at the n1 limit selected from the flight management
system computer display unit, n1 is enunciated with the autothrottle and the n1
switch illuminates. pressing the n1 switch changes the auto throttle mode from
n1 to armed. if an engine fails while the auto throttle is

in the n1 mode the thrust lever of the failed engine would advance
forward a few degrees and return to or below the other thrust lever position. the
speed mode is available throughout the flight once the takeoff phase is completed.
pressing the mode control panel speed selects which selects the speed mode if
compatible with the engaged automatic flight director system pitch mode. MCP
speed is enunciated for the auto throttle and the speed mode switch illuminates
the speed or Mac shown in the mode control panel IAS Mac display is the target
speed the auto throttle will not set power above the displayed n1 limit however
the auto throttle can exceed an n1 value that had been manually set by the n1
manual set knob if an engine fails while the auto throttle is in a speed mode
both thrust levers advance together to maintain the target speed the flight
management system speed mode is an auto throttle mode which is commanded by the
flight management system during vertical navigation operation when engaged the
mode control panel IAS mag display is blank the SB cursors are positioned at
the flight management systems commanded airspeed and the auto throttle
maintains this commanded speed our FMC speed is enunciated in the auto throttle
flight mode annunciator the auto throttle is limited to the n1 value shown on
the n1 gauge on the engine instruments and crew alerting system display the
autothrottle enunciates arm when the auto throttle arm switch is at arm and no
auto throttle mode is engaged the thrust levers can be manually positioned without
interference from the auto throttle system while arm is enunciated the auto
throttle automatically transfers to arm from the speed or n1mode when the mode
is be selected by pressing the respective mode selector switch while the switch
is illuminated the autothrottle engages and enunciates retard during level
change and vertical navigation descents retard changes to arm when the thrust
levers reach the aft stop or when manually prevented from reaching the aft stop
during landing the retard mode engages reduces thrust and enunciates retard shortly
after flare mode engagement or at 27 feet Radio altitude whichever occurs first
during a non-precision or visual approach with flaps extended to 15 or greater
and the automatic flight director system not in altitude require or altitude
hold the autothrottle retard mode engages at 27 feet Radio altitude the
autothrottle automatically disengages approximately two seconds after landing
touchdown with the autothrottle armed switch at arm i autothrottle go around
mode is armed when descending below 2,000 feet

radio altitude with or without the automatic flight director system
engagedonce armed the autothrottle go-around mode can be engaged until two
seconds have elapsed after landing touchdown pressing either takeoff go-around
switch engages the autothrottle go-around mode thrust or n1 is enunciated for
the auto throttle and the thrust levers advanced to the reduced go-around
thrust setting this reduced setting produces a 1,000 to 2,000 feet per minute
rate of climb after reaching reduced go-around thrust pressing either
takeoff go-around switch the second time signals the auto throttle to advance
thrust to the full go-around n1 limit after reaching reduced or full go-around
thrust the auto throttle go-around mode can be terminated by selecting another automatic
flight director system pitch mode or when altitude acquire enunciates engaged

 

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