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engaged or in an onground
armed state (normal disconnect).
· Toggling an engage/disengage switch, located on either thrust lever, while the system is
engaged or in an onground
armed state (normal disconnect).
· Overriding the system by manually positioning the thrust levers, while A/T is engaged
(abnormal disconnect). Movement of the thrust levers while in an onground
T/O armed
state, will not disconnect the system.
GF1810_047
1 Pressing quick disconnect button(s). 2 Toggling an engage/disengage switch.
3
AUTOTHROTTLE
Overriding by manually advancing or retarding the thrust levers.
NOTE
The thrust levers may retarded during a rejected takeoff
above 60 knots, without manually disengaging or
overpowering the A/T servos. The servos are unpowered above 60 knots when the A/T enters into HOLD
THRUST mode. An abnormal disconnect warning will be generated if the disengage switch is not pressed.
190 ROLL 3 000
20 20
TO
180
170
160
150
145
6
1500
1000
A/T1
POWER PLANT
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
18−10−34
AUTOTHROTTLE SYSTEM (CONT'D)
A/T Mode Operation
The A/T system is integrated with the flight control systems of the airplane to provide compatibility
with the active pitch mode of the Flight Guidance System (FGS). The flight guidance pitch mode is
normally determined by the flight director or autopilot and is influenced by the FMS during vertical
navigation control. The A/T mode operation results in A/T thrust control which complements the
pitch control being performed by the FGS. In the event that no FGS pitch mode is active, the A/T
will provide independent thrust control based on internally computed mode.
The following table outlines the integrated functional control provided by the A/T and FGS for the
various control modes of the AP/FD and FMS for specified phases of a typical flight.
GF1810_048
FLIGHT
PHASE
AP/FD
PITCH MODE
FMS
PITCH MODE
(VNAV)
AUTOTHROTTLE
FUNCTION
AP/FD/FMS
FUNCTION
Takeoff Roll Takeoff Sets TO rated thrust or FLEX reduced thrust
by controlling to the MAX or FLEX EPR rating.
Throttle servos depower
when airspeed
reaches 60 knots
N/A Pitch Control
Takeoff Takeoff Throttle servos remain depowered
until 400 ft.
Climb Out N/A Above 400 ft AGL A/T controls to active MAX Pitch Control
or FLEX T/O EPR rating
Small Flight Flight Level Change Reduced climb thrust during FLC and VFLC
Level Changes Airspeed control during PIT and VS Pitch Control during PIT
(Climb)
(FLC), Pitch Hold (PIT)
Vertical Speed (VS)
VNAV Flight
Level Change
(VFLC)
Airspeed control during FLC and VFLC
Vertical speed control during VS
Large Flight Flight Level Change Climb thrust during FLC and VFLC
Level Changes Airspeed control during PIT and VS Pitch Control during PIT
(Climb)
(FLC), Pitch Hold (PIT)
Vertical Speed (VS)
VFLC Airspeed control during FLC and VFLC
Vertical speed control during VS
Top of Climb Altitude Capture VNAV Altitude Airspeed Control Altitude Capture Control
(TOC) Capture
Cruise Altitude Hold VNAV Altitude Airspeed Control Altitude Control
Hold
Top of Descent FLC or VS Transition to idle thrust during FLC and VFLC
(TOD) Airspeed control for VS Vertical speed control during VS
VFLC Airspeed control during FLC and VFLC
FLC FLC, PIT or VS Full idle during FLC and VFLC
(Descent) Airspeed control during PIT, VS and VPATH Pitch Control during PIT
VFLC or VNAV
Path Descent
(VPATH)
Airspeed control during FLC and VFLC
Vertical speed control during VS and VPATH
Approach Glideslope Track N/A Airspeed Control Glideslope Control
Flare Glideslope Track N/A Thrust retard to Idle stop Disengaged
Landing/Roll N/A N/A Disengaged Disengaged
Go Around Go Around N/A Sets GA thrust Pitch Control
Windshear Windshear N/A Sets GA thrust Pitch Control
Typical Flight Profile
1
2
3
4
5 6 7
8
9
10 11
12 13
1
2
3
4
5
6
7
8
9
10
11
12
13
Small or Large
Flight Level
Changes
POWER PLANT
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
18−10−35
AUTOTHROTTLE SYSTEM (CONT'D)
Takeoff
Thrust Control Mode
The takeoff
thrust control mode is activated when the A/T is armed for engagement for takeoff,
　
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