KLM MD-11 - AP;FD Speed Mode Reversions

MD-11 Flight Crew Operations Manual
k
Automatic Flight -
Description and Operation
Auto.10.25
The pilot may counteract the LSAS overspeed or stall protection by pushing on
the control column with enough force to defeat the LSAS elevator inputs. This
force is approximately 50 pounds. If the pilot releases the control column force
rapidly, LSAS will dampen the resulting elevator instability. For further
information refer to LSAS description in the Flight Controls chapter.
AP/FD Speed Mode Reversions
Detection of speed limit violations in FMS SPD or PROF modes disengages the
FMS and the AFS will resume control (if engaged).
If the FCP level change/speed on pitch mode is engaged, the ATS is off, and a
Vmax or FMS Vmin speed limit violation occurs the following will happen:
At 5 knots over or underspeed:
• The AP/FD pitch control mode reverts to V/S FPA at the existing vertical
speed/flight path angle.
• ATS engages in speed-on-thrust speed protection with a Vmin or Vmax
speed target.
• The FMA flashes THRUST and V/S or FPA five times before becoming
steady.
• The FMA flashes HI SPEED PROTECTION or LO SPEED
PROTECTION.
At 10 knots over or underspeed:
• The AP/FD pitch mode reverts to pitch speed protection with a Vmin or
Vmax speed target.
• The throttles are clamped at their existing positions.
• The FMA flashes PITCH five times before becoming steady.
• The FMA flashes HI SPEED PROTECTION or LO SPEED
PROTECTION.
If the level change/speed on pitch mode is engaged, the ATS is on, and a Vmax or
FMS Vmin speed limit violation occurs, the following will happen at 5 knots over
or underspeed:
• The AP/FD remains in speed on pitch mode but with an increased “g”
limit and a Vmin or Vmax speed target.
• ATS speed protection will not engage at any time.
• The FMA flashes HI SPEED PROTECTION or LO SPEED
PROTECTION.
If the V/S FPA mode is engaged, the ATS is off, and a Vmax or FMS Vmin speed
limit violation occurs, the following will happen:
At 5 knots over or underspeed:
• The ATS engages in speed-on-thrust speed protection with a Vmin or
Vmax speed target.
October 02, 2006