MD-11 Flight Crew Operations Manual
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Warning and Alerting -
Description and Operation
Warn.10.14
Altitude Advisory Warning
The CAWS will sound an aural warning tone and turn the PFD precision altitude
amber to caution the flight crew if the aircraft approaches a preselected altitude or
deviates from the preselected altitude. The altitude advisory operates
independently from the engagement of the flight director or autopilot. The altitude
advisory function receives input from both Flight Control Computers (FCC). This
dual advisory circuit will annunciate the first advisory signal received.
Takeoff Warning
A takeoff warning aural signal (intermittent horn identical to cabin altitude
warning) will warn the flight crew of an unsafe takeoff configuration. The
warning will sound when either throttle 1 or 2 is advanced for takeoff with the
ground shift mechanism in the ground mode and any one of the following
conditions exist:
1. Stabilizer settings not in green band
2. Slats not extended
3. Flaps not in agreement with setting on FMS TAKE OFF page (plus or minus
3 degrees)
4. Parking brake set.
Cabin Low Pressure Warning
The CAWS will provide an aural warning tone for detected cabin low pressure.
The warning will automatically actuate when the cabin altitude exceeds 10,000
feet. The warning will cycle three times and reset when the altitude switch resets.
Overspeed Warnings
The CAWS will provide an aural warning tone when an overspeed condition is
detected by either Central Air Data Computer (CADC). The CAWS will also
provide an aural warning whenever the aircraft exceeds the maximum speed with
the slats extended. The clacker will sound when airspeed exceeds 280 knots and
the slats are extended.
Autopilot Disconnect Warning
The CAWS will provide an aural warning tone when a disconnect signal is
received from either FCC.
Horizontal Stabilizer Motion Warning
During flight, a horn will sound to alert the flight crew that the horizontal
stabilizer is in motion. The warnings sound after each continuous movement of
more than 2 degrees stabilizer travel at a rate greater than 0.08 degrees per second
for manual trim and after continuous movement of more than 2 degrees stabilizer
when in the automatic pitch trim mode.
November 16, 2009
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