MD-11 Flight Crew Operations Manual
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Automatic Flight -
Description and Operation
Auto.10.17
Engaging the AP/FD go-around mode cancels the FMS SPD switch and selects
current airspeed or FMS VMIN GA reference (whichever is higher).
IAS to MACH and MACH to IAS changeover is computed by the FMS when the
FMS SPD mode is engaged.
The FMS speed edit occurs if a speed is preselected and the FMS SPD switch is
pushed within ten seconds. The IAS/MACH preselect window on the FCP will be
blank.
FMS Vertical Profile Control
FMS vertical profile mode control is engaged by pushing the PROF switch. When
the FMS PROF mode is engaged, the AP/FD responds to the requirements of the
preplanned vertical profile.
The FCP altitude display window setting is always the absolute ceiling or floor
altitude in all AFS modes including FMS PROF except during engine out when
the altitude display window may be violated during driftdown.
Compatible control of the AP/FD and ATS modes is computed by the FMS when
PROF is engaged.
PROF mode will not engage if any of the following are true:
• Both autopilot and flight director are disengaged.
• In DUAL LAND or SINGLE LAND.
• Below 400 feet radio altitude.
PROF can be armed on the ground. If armed, PROF will engage automatically at
400 ft RA.
PROF mode disengages if any of the following are true:
• The pitch wheel is rotated to engage the V/S-FPA mode.
• The altitude knob is pushed or pulled.
• Go-around or glideslope becomes the active pitch mode.
• Radio altitude becomes less than 100 feet.
• Windshear detection or guidance mode becomes active.
• Autothrottle Speed Protection becomes active.
FMS Lateral Navigation
Pushing the NAV switch on the FCP arms the AFS/FMS NAV mode. NAV
ARMED is then displayed on the FMA.
NAV ARMED is reset by:
• Pushing the FCP HDG/TRK select knob to select the existing heading.
• Selecting APPR/LAND.
• Selecting the optional VOR or LOC ONLY modes.
October 02, 2006
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