MD-11 Flight Crew Operations Manual
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Automatic Flight -
Description and Operation
Auto.10.28
These LSAS changes will not affect the maximum override forces for LSAS,
which are dependent upon the position of the Elevator Load Feel (ELF) actuator
for any given airspeed. For the takeoff and landing phases, where PAP and PNL
are active, the control column forces required to override LSAS are approximately
10 to 15 pounds.
Altitude Alert System
The altitude alert system automatically alerts the flight crew that the aircraft is
approaching the preselected altitude or that the aircraft is deviating from a
preselected and acquired altitude.
The altitude alert system is always on except when the FD or AP is engaged in the
glideslope mode. In this case, the altitude alert system is inhibited.
The altitude alert activates as follows:
1,000 feet from the FCP window altitude - PFD altitude box turns steady amber.
If more than 0.12g required to capture FCP window altitude - Steady amber PFD
altitude box and tone. Active only on first approach to the FCP window altitude
and is inhibited when aircraft is within 150 feet. If more than 0.12g is required to
capture the FCP window altitude and that altitude is more than 1000 feet from the
current baro-altitude, the PFD altitude box will be flashing amber. This condition
requires an initial vertical speed of more than 5200 fpm and is rare.
Deviation of 150 feet or more from FCP window altitude - Flashing amber PFD
altitude box and tone. The flashing amber altitude box will reset when the aircraft
returns to the set altitude or a new altitude is selected.
Altitude alerting is not affected by the AFS OVRD switch on the FCP
NOTES: The tone consists of a C-chord.
The altitude alert system is inhibited if the AFS is in glideslope
capture mode or flap setting is more than 31.5 degrees (landing).
Windshear Alert and Guidance
General
The windshear alert and guidance system (WAGS) provides detection, alerting,
and guidance through windshear.
WAGS is inhibited until nose gear liftoff. On landing WAGS is available from
1500 feet RA to 50 feet RA.
October 02, 2006
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