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NOTE
All parameters must be stable for a minimum of 30 seconds prior to
N2 SYNC engagement.
When the N2 SYNC pushbutton is engaged, the SPEED N2 message is displayed on the ATS
mode status display. The system returns to N1 synchronization mode for any of the following
conditions:
• Pressing the N2 SYNC pushbutton a second time after engagement;
• Changing the AFCS airspeed reference; or
• Airspeed changes more than 20 KIAS since N2 SYNC was engaged.
ATS Cruise
Figure 04−10−52
Descent
Descent operation in the AFCS flight level change (FLC) mode:
• DESCENT message displayed in the MSD;
• Four−second thrust reduction will occur, then servo commands stop; and
• ATS control panel green LEDs extinguish.
The throttle levers must be controlled manually to set engine thrust, to accomplish the desired
descent rate.
Descent operation in non-FLC mode:
• SPEED message displayed in the MSD; and
• Select desired airspeed with speed bug or FMS, VNAV PLAN SPD.
The ATS will control engine thrust to maintain the desired airspeed reference.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−66
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUTOTHROTTLE SYSTEM (CONT'D)
Approach
The ATS may be used during approach with the following:
• APPR, NAV, VNAV, VS, Pitch or with no AFCS modes selected.
The ATS will be in SPEED mode, and is controlled by the AFCS airspeed reference.
NOTE
ATS operation is prohibited during category II approaches.
When the landing gear is down and the flaps are positioned at 45 degrees:
• The autothrottle system inputs a HI gain mode to the ATS servos, which provide a more
accurate speed tracking.
This gain allows for a more rapid engine response, due to the higher power lever angle (PLA)
rate of movement.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−67
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUTOTHROTTLE SYSTEM (CONT'D)
Descent/Approach Modes
Figure 04−10−53
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−68
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUTOTHROTTLE SYSTEM (CONT'D)
Landing
The SPEED message begins to flash while descending through 100 feet radio altitude, to
indicate that retard mode is set. If flashing SPEED message is not present, the ATS must be
disengaged, and the throttle levers manually controlled.
NOTE
The ATS must be disengaged if flap settings other than 45 degrees
are used for landing. The “retard” function is not active with flap
settings other than 45 degrees.
At 50 feet radio altitude, the ATS RETARD message replaces the flashing SPEED message,
and the ATS retards the throttle levers at a scheduled fixed rate.
At main landing gear weight-on-wheels, the ATS will fully retard the throttle levers, then
disengage three seconds after touchdown. The green ATS control annunciators extinguish, and
the MSD goes blank.
After landing, when the airspeed falls below 40 KIAS, the ATS may display a flashing amber fail
message in the MSD. This condition is the result of FMS data no longer being valid, and
pressing either ATS DISC switch cancels the FAIL message.
Go-Around
NOTE
Certification of the ATS go-around mode of operation is pending.
The aircraft must be flown manually for all go-around or missed
approach procedures.
Selection of either TOGA switch results in the following:
• FMS automatically posts the takeoff N1 limit in the EICAS N1 speed display;
• The AFCS transitions to the go−around mode;
• ATS MSD units display the N1 TO message; and
• ATS servos quickly advance the throttle levers to achieve takeoff N1 thrust limit.
ATS takeoff thrust can be initiated at any time before shutdown, which is defined by the landing
gear weight-on-wheels signal being valid.
During go-around climb, the ATS disregards the AFCS airspeed reference and the altitude
preselector, and remains in the N1 TO thrust limit until another AFCS vertical mode is selected.
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−69
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AUTOTHROTTLE SYSTEM (CONT'D)
Landing and Go-Around Modes
Figure 04−10−54
AUTOMATIC FLIGHT CONTROL SYSTEM
Description
Vol. 2 04−10−70
Oct 05/06
CL−605 Flight Crew Operating Manual
　
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