MD-11 Flight Crew Operations Manual
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Automatic Flight -
Controls and Displays
Auto.30.7
If the IAS is displayed, pushing the IAS/MACH changeover button allows
display and preselection of the desired cruise Mach. The preselected IAS is
retained and displayed when the changeover button is pushed again. At the
altitude where the selected IAS corresponds to the preselected Mach, the
display and the selected speed reference will automatically change to the
Mach mode. The inverse operation (IAS preselection) is available for
descent. Changeover to the equivalent Mach or airspeed value occurs
automatically at 26,000 feet if no Mach has been preselected.
Pull to select:
• Disengages the FMS speed mode (if engaged).
• The preselected target speed becomes the selected speed.
• The window displays the selected speed.
• The aircraft will follow and capture any selected speed value while in this
mode with a pitch or thrust change as appropriate.
• Once the selected speed is captured, the system will automatically revert
to the speed hold mode and the IAS/MACH select knob must be rotated,
then pulled, to select a new speed. During the capture phase, the selected
speed is changed if the knob is rotated.
Push to hold:
• Disengages FMS speed mode (if engaged).
• The aircraft will maintain the present speed plus or minus any small
increment if required for a smooth capture.
• The window displays the capture speed.
• Turning the knob in this mode preselects a new speed. The knob must be
pulled to select the preselected speed.
4. FMS SPD Switch
Pushing selects the armed FMS speed, typically an ECON speed, and cancels
any selected or preselected speed or Mach number. The IAS/MACH display
window shows IAS -- or MACH -- and the FMA speed target and speed
control legend changes from white to magenta. Pushing the FMS SPD switch
within 10 seconds after preselecting an FCP speed results in editing the
FMS-computed speed. The window shows IAS -- (or MACH --) and the PFD
FMA speed is the edited FMS speed reference in white (magenta if equal to
ECON speed).
The FMS SPD mode is disengaged by pushing or pulling the IAS/MACH
select knob or by engaging go-around modes.
On takeoff, pushing the PROF switch above 400 feet AGL engages PROF
and FMS SPD.
October 02, 2006
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