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The A/T system is integrated with the flight control systems of the airplane to provide
compatibility with the active vertical mode of the Flight Guidance System (FGS). The
flight guidance vertical 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 compliments the pitch control being
performed by the FGS. In the event that no FGS vertical 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.
FLIGHT PHASE AP/FD VERTICAL
MODE
FMS VERTICAL
MODE (VNAV) AUTOTHROTTLE FUNCTION AP/FD/FMS FUNCTION
1 Takeoff Roll Takeoff (TO) N/A
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
Pitch Control
2 Takeoff Climb Out Takeoff (TO) N/A
Throttle servos remain depowered until
400 ft. Above 400 ft AGL A/T controls
to active MAX or FLEX T/O EPR rating
Airspeed control during FLC and
VFLC. Pitch Control during PIT.
Vertical speed control during VS
3 Small Flight Level
Changes (Climb)
Flight Level Change
(FLC), Pitch Hold (PIT)
Vertical Speed (VS)
VNAV Flight Level
Change (VFLC)
Reduced climb thrust during FLC and
VFLC. Airspeed control during PIT and
VS
Airspeed control during FLC and
VFLC. Pitch Control during PIT.
Vertical speed control during VS
4 Large Flight Level
Changes (Climb)
Flight Level Change
(FLC), Pitch Hold (PIT)
Vertical Speed (VS)
VFLC
Reduced climb thrust during FLC and
VFLC. Airspeed control during PIT and
VS
Airspeed control during FLC and
VFLC. Pitch Control during PIT.
Vertical speed control during VS
5 Top of Climb
(TOC)
Altitude Capture
(ASEL)
VNAV Altitude Capture
(VASEL) Airspeed Control Altitude Capture Control
6 Cruise Altitude Hold (ALT) VNAV Altitude Hold
(VALT) Airspeed Control Altitude Control
7 Top of Descent
(TOD) FLC or VS VFLC Transition to idle thrust during FLC and
VFLC. Airspeed control for VS
Airspeed control during FLC and
VFLC. Vertical speed control
during VS
8 FLC (Descent) FLC, PIT or VS VFLC or VNAV Path
Descent (VPATH)
Full idle thrust during FLC and VFLC.
Airspeed control during PIT, VS and
VPATH
Airspeed control during FLC and
VFLC. Pitch Control during PIT.
Vertical speed control during VS
and VPATH
9 Approach Glideslope Track N/A Airspeed Control Glideslope Control
10 Flare Glideslope Track N/A Thrust retard to idle stop Disengaged
11 Landing/Roll N/A N/A Disengaged Disengaged
12 Go Around Go Around N/A Sets TO Pitch Control
13 Windshear Windshear N/A Sets TO Pitch Control
GX_17_006
1 2
3
4
5 6 7
8
9
10
11
12 13
17-60 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
TAKEOFF THRUST CONTROL MODE
The takeoff thrust control mode is activated when the A/T is armed for engagement for
takeoff, airspeed less than 60 knots and both thrust levers are set above 23°,
corresponding to 60% of maximum thrust. Once activated, the A/T will advance the
thrust to the TO EPR rating. The A/T will control the thrust lever to the active EPR
rating during takeoff roll until the airspeed increases above 60 knots, at which time the
takeoff thrust hold control mode activates.
The takeoff thrust control mode reactivates at an altitude transition of 400 feet during
the takeoff climb-out. If a change to the active EPR rating, either by the crew or by
automatic means, has occurred, then the A/T will control the engine power setting to
the new active rating.
TAKEOFF THRUST HOLD CONTROL MODE
The takeoff thrust hold control mode is activated to ensure that no thrust reductions
occur during takeoff between the time the airplane transitions above 60 knots to 400
feet AGL.
The takeoff thrust hold control mode deactivates as the airplane transitions through
400 feet AGL during takeoff climb out.
A/T T/O mode will remain enabled until 400 feet AGL. Following the 400 feet AGL
transition, with A/T engaged, T/O mode remains active until a non T/O AP/FD mode
activates.
NOTE
Anytime an A/T mode changes, it will flash for 5 seconds.
GX_17_007
On Ground below 60 knots, thrust TO EPR On Ground above 60 knots
　
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