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shown in the ATS mode status display (MSD) unit.
The ATS may be engaged for takeoff using either method described:
• Automatic engagement – Advance the throttle levers for takeoff. When both engines
reach 75% N1, the ATS engages, the green LEDs illuminate on the ATS control panel,
and the ATS servos advance the throttle levers to the takeoff N1 thrust limit computed by
the FMS.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−63
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUTOTHROTTLE SYSTEM (CONT'D)
• Manual engagement – Press the ATS engage pushbutton on the ATS control panel. The
ATS engages, the green LEDs illuminate on the ATS control panel, and the ATS servos
advance the throttle levers to the takeoff N1 thrust limit computed by the FMS.
Confirm that engine power is set to takeoff N1 limit prior to 80 KIAS, which is the speed that the
ATS ceases servo commands. The N1 HOLD message replaces the N1 TO message in the
MSD, and the green LEDs extinguish.
ATS Takeoff
Figure 04−10−50
During strong headwind takeoff, it is possible that takeoff thrust may not be set by the ATS prior
to reaching 80 KIAS, and the crew must position the thrust levers, as required, to attain takeoff
thrust.
At 329 ft barometric altitude above takeoff elevation, the ATS re-engages the throttle lever
servos, the N1 HOLD message is replaced by the N1 TO message, and the green LEDs
illuminate on the ATS control panel.
During initial climb, the ATS remains at N1 TO mode, and continues to adjust engine thrust in
accordance with the N1 takeoff thrust limit schedule calculated by the FMS.
Climb
The ATS remains in the N1 TO mode unless the following occurs:
• Autopilot is engaged, causing the ATS to transition to the SPEED mode (except in AFCS
FLC mode);
• Airspeed increases to within 10 KIAS below the AFCS airspeed reference (speed bug),
causing the ATS to transition to the SPEED mode (except in AFCS FLC mode or
go-around mode); or
• New FMS thrust limit is chosen. Climb (CLB), cruise (CRZ) or N1 target (TGT) thrust limit
may be selected.
Selecting climb (CLB) in the FMS “THRUST LIMIT” page results in transition to N1 climb mode,
and the N1 CLB message replaces the N1 TO message.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−64
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUTOTHROTTLE SYSTEM (CONT'D)
Selecting the desired AFCS vertical mode:
• AFCS FLC – ATS remains in N1 climb mode, and continues to adjust the throttle levers
in accordance with the FMS climb thrust limit.
• AFCS non-FLC – If vertical mode is selected, and the AFCS speed bug is selected
higher than the current airspeed, the ATS transitions to speed mode and captures and
tracks the AFCS airspeed reference. The SPEED message replaces the N1 CLB
message in the MSD. If vertical mode is selected, and the AFCS speed bug is selected
below the current airspeed, the ATS remains in N1 mode and tracks the FMS thrust limit.
If the ATS is engaged in flight with no AFCS vertical mode selected, the ATS engages in speed
mode. When wing and/or cowl anti-ice is selected at or above 30,000 ft, the ATS posts a FAIL
message, and disengages.
ATS Climb
Figure 04−10−51
N1 Thrust Target
If target (TGT) is set on the FMS “THRUST LIMIT” page, the target N1 percentage can be set
from 76 to 98.5. The ATS will set engine thrust to this target regardless of the aircraft’s
operating limit. Note that this mode is not available for ATS takeoff.
Cruise
Desired cruise airspeed is set with the AFCS airspeed reference (speed bug) and desired thrust
limit in the FMS “THRUST LIMIT” page. The SPEED message is displayed in the ATS mode
status display. The aircraft accelerates with the selected thrust limits until the AFCS airspeed
reference is attained. The ATS then reduces thrust as necessary to hold the AFCS airspeed
reference.
N2 Sync
N2synchronization is available if the following conditions are met:
• Autopilot is engaged;
• AFCS altitude hold is engaged;
• ATS is in speed mode;
• Airspeed is stabilized at the airspeed reference (speed bug);
• Airspeed reference in Mach is displayed on the PFD; and
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−65
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUTOTHROTTLE SYSTEM (CONT'D)
• Engine N1 fan speeds are within 0.6% at the time of engagement.
　
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