KLM MD-11 - Autoland

MD-11 Flight Crew Operations Manual
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Automatic Flight -
Description and Operation
Auto.10.12
For single FCC operation in modes where dual FD operation is required (takeoff,
go-around, ILS category II approach), the AFS provides continuous FD command
comparison monitoring of the two channels within the FCC. A comparison failure
within the FCC will result in the removal of the command bar from both PFDs for
the affected axis only. Once removed due to a failure, the FD command bars will
not be displayed again until the dual mode is cancelled.
Below 1500 feet RA, dual FD approach mode can only be exited by pushing the
go-around button.
Autoland
Autoland adds align, flare, nose lowering, and rollout modes to the normal
approach modes (localizer capture, localizer track, glideslope capture, glideslope
track).
The SINGLE LAND and NO AUTOLAND alerts indicate the land availability of
the aircraft. SINGLE LAND indicates that a CAT II approach may be continued
automatically. NO AUTOLAND indicates that there is insufficient equipment
redundancy to perform an automatic landing.
Automatic landings have been demonstrated using a reference approach speed of
1.3Vs + 5 kts. under the following wind conditions:
• Headwinds to 25 kts.
• Tailwinds to 10 kts.
• Crosswinds to 15 kts.
When available, DUAL LAND mode will automatically engage when the aircraft
is in approach, tracking both the localizer and glideslope, and has been below
1500 feet RA for ten seconds. If the requirements for DUAL LAND are not met
but SINGLE LAND is available, SINGLE LAND will engage between 1500 feet
(for ten seconds) and 400 feet RA.
If the equipment redundancy requirements for DUAL LAND and SINGLE LAND
are not met, or if a land mode is not engaged prior to 400 feet RA, the AFS will
revert to APPROACH ONLY. In the APPROACH ONLY mode, the aircraft will
continue to automatically track the localizer and glideslope but the autoland
function will not be available. The AP must be disengaged prior to 100 feet and a
manual landing performed.
When the aircraft is tracking localizer and glideslope in an FD approach, engaging
the AP between ten seconds after descending below 1500 feet (approximately
1360 feet) and prior to five seconds before 400 feet (approximately 460 feet) will
also engage DUAL LAND or SINGLE LAND mode depending on equipment
redundancy.
The ILS receivers are inhibited from further tuning when the GS or LOC modes
are captured.
October 02, 2006