KLM MD-11 - AP;FD Heading;Track Select;Hold; AP;FD Approach

MD-11 Flight Crew Operations Manual
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Automatic Flight -
Description and Operation
Auto.10.10
AP/FD Heading/Track Select/Hold
Heading or track select is engaged by pulling the HDG/TRK select knob on the
FCP. If the HDG/TRK display window is blank when the knob is pulled, the
current heading or track is selected and the heading select or track select mode
engages.
The AP/FD captures the selected heading by turning the aircraft or commanding
a bank in the direction the HDG/TRK select knob was turned.
Additional changes may be made while still in the turn. After the aircraft stabilizes
on the selected heading or track, control will transition to heading or track hold.
The roll control window on the FMA shows HEADING or TRACK and displays
the digital heading or track.
Heading or track angle hold is engaged by pushing the HDG/TRK select knob on
the FCP. If the aircraft is in a bank at the time of hold selection, the aircraft will
roll wings level and the reference heading or track will be the existing value at the
time the HDG/TRK knob was pushed. The HDG/TRK display window on the
FCP will display the held reference value.
The commanded bank angle limit will be the bank angle selected with the bank
angle limit selector (5 to 25 degrees) and the FMS computed bank angle limit. If
the bank limit is selected to AUTO, the limit value will be the least of a value
varying linearly from 5 degrees at 340 KIAS to 25 degrees at 210 knots KIAS and
the 1.3g buffet limit. At 1.3 V stall, the limit is further constrained to a maximum
roll angle of 15 degrees. The 1.3g buffet and the 1.3 Vstall speed protection is
contingent on FMS availability.
If the bank angle limit selector is set to the AUTO position, the bank angle limit
value will vary as follows:
• Between 15 degrees and 25 degrees from zero Mach to Mach 0.17.
• Limited to 25 degrees between Mach 0.17 and Mach 0.55.
• Reduced linearly to 20 degrees at Mach 0.80, 10 degrees at Mach 0.87,
and wings level at Mach 0.93.
If the FMS is not available, the AFS provides the Mach bank angle limit schedule.
In this case, the Vmin protection is lost. The bank angle limit selector is
overridden in the NAV, localizer, or TO/GA modes (computed limits apply).
AP/FD Approach
The AFS provides automatic flying of precision approaches to ILS category I, II,
IIIA and IIIB weather minimums and manual guidance (flight director) for flying
precision approaches to ILS category I weather minimums. Non-precision
approaches may be made either manually or automatically by coupling the FMS
NAV and PROF modes or using the AFS track and flight path angle (FPA) modes.
October 02, 2006