MD-11 Flight Crew Operations Manual
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Automatic Flight -
Description and Operation
Auto.10.21
IAS Select - Provides control of throttles to acquire and maintain a selected
reference speed.
Mach Hold - Provides control of throttles to maintain the current MACH number.
Mach Select - Provides control of throttles to acquire and maintain a selected
reference Mach number.
Thrust Limit/Target - Provides control of throttles to acquire and maintain thrust
at the thrust limit/target.
Retard - Provides control of throttles to reduce thrust at the appropriate radio
altitude for landing.
Clamp - Inhibits ATS control during takeoff at approximately 80 knots without
causing disengagement of the ATS. Full manual throttle is available during this
mode.
ATS Engage
The ATS is engaged when the AUTO FLIGHT switch on the FCP is pushed. The
ATS will also engage when the PROF switch is pushed. Both ATS channels will
engage if they are operational.
The ATS engages automatically to provide high speed or low speed protection if
the aircraft speed exceeds the Vmax/Vmin limits.
ATS Disengage
The ATS will engage with AFS engagement in most cases. The ATS may be
disengaged by any of the following:
• Pushing either throttle 1 or 3 ATS disconnect switches.
• Placing any throttle in reverse thrust.
• System failure (may result in single or dual channel disengagement
depending on the fault).
• Pushing down the AFS OVRD OFF switches on the FCP.
Annunciation of ATS disengagement is provided on the FMA. A disengage
warning is provided for all cases except when the disengagement is due to reverse
thrust operation.
The warning consists of a flashing red ATS OFF display. The display is reset by
ATS engagement or by pushing the ATS disconnect switches.
If reset by reengagement, the ATS OFF display disappears. If reset by an ATS
disconnect switch the flashing stops and the ATS OFF display changes color to
white if ATS reengagement is possible. The display will turn amber if a condition
prevents further use of the system.
October 02, 2006
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