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Dual Servo Clutch/Servomotor Figure 04.10.46
ATS Control Panel
The ATS is controlled by a glareshield-mounted ATS control panel that incorporates a system engage pushbutton (ATS), two green LED engaged annunciators, plus an N2 synchronization pushbutton (N2 SYNC).
Whenever the ATS servos are engaged, the two green LED annunciators located immediately left and right of the ATS pushbutton illuminate.
AUTOMATIC FLIGHT CONTROL SYSTEM Description Vol. 2 04.10.59
Oct 05/06
ATS Mode Status Display
Two mode status display (MSD) units, located in the glareshield (pilot and copilot positions), provide mode annunciation and caution messages for the ATS.
Each MSD incorporates a 2-line, 8-character LED alphanumeric display. The top line is green, and displays ATS mode messages. The bottom line is amber, and displays ATS caution and disengaged messages.
Lighting
The ATS control backlighting intensity is controlled by the center instrument panel lighting dimmer control. The MSD intensity and the ATS control engaged annunciator intensity are controlled by the IND LTS BRT/DIM intensity selector on the overhead panel. If the ATS is powered up with the IND LTS switch in the DIM position, the ATS control green LED annunciators and MSD remain in bright mode until the BRT/DIM switch is cycled.
ATS Control Panel
Figure 04.10.47
ATS Modes of Operation
There are two modes of operation for the ATS:
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N1 mode – The ATS computer develops a throttle drive command derived from the FMS N1 computation for takeoff, based on pilot input from the FMS.
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Speed mode – Controlled by using the SPEED knob on the FCC control panel.
The ATS is capable of controlling engine thrust from takeoff to touchdown, using the AFCS vertical modes and VNAV-plan speeds. The system uses the FMS thrust management table-based N1
limit and target calculations, displayed on the EICAS N1 fan speed displays. ATS thrust or speed mode selections are automatic, based on the AFCS mode logic. The AFCS airspeed reference (speed bug) is used to select ATS speed targets, displayed on the primary flight display (PFD). In VNAV-plan speeds, the ATS tracks the PFD magenta speed cursor.
The following table is a summary of the ATS operating modes and displays.
AUTOMATIC FLIGHT CONTROL SYSTEM Description Vol. 2 04.10.60
Oct 05/06
ATS MODE THRUST/SPEED MODE MSD MESSAGE AFCS
TAKEOFF TO
TAKEOFF (≥80 KIAS to
SERVO COMMANDS
320 ft above takeoff N 1HOLD TO
CEASE
elevation) CLIMB (except FLC) ANY (except FLC) CLIMB (FLC) N 1 N1 CLB FLC CRUISE Altitude CRUISE (N2 SYNC) Altitude DESCENT (except FLC) MACH or IAS SPEED ANY (except FLC)
DESCENT (FLC) FLC
MANEUVERING/
IAS SPEED ANY (except FLC)
APPROACH
LANDING (<50 FT RA) DISENGAGED
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