Glideslope, which it cancels along
with Approach.
Roll
rate commands increase in
direct proportion to the degree of
Roll
Attitude Control knob deflection, up to
the Flight Control System's maximum
commandable roll rate or attitude.
Releasing the knob allows it to return
automatically to its center position.
The flight director will command the
aircraft to maintain the existing roll
attitude. Roll attitudes of less than two
degrees of bank angle will revert to
wings-level flight.
Vertical
Trim
A three position, return-to-center
rocker switch mounted centrally within
the
Roll
Attitude Control knob acti-
vates Vertical Trim. Calibration of the
control varies depending on the flight
director mode engaged and whether
the flight crew activates the Vertical
Trim switch momentarily, allowing it to
return to center immediately upon
feeling it click (Discrete Trim), or holds
the switch in position for several
seconds at a time (Continuous Trim).
Pressing the upper portion of the
rocker switch adjusts the aircraft's
pitch attitude downward, and pressing
the lower portion adjusts the attitude
upward.
Activating Vertical Trim cancels
certain flight director vertical tracking
modes, but has no effect on modes
engaged in the Arm phase. The flight
director will revert to Pitch Attitude
Hold
if
it was coupled in Glideslope,
VNAV, Climb, Altitude Capture or Go-
Around at the moment of trim activa-
tion.
If
the Descent mode was
coupled, the flight director will revert
to Vertical Speed Hold. Mach Hold,
Altitude Hold, Indicated Airspeed Hold
and Vertical Speed Hold will remain
coupled throughout Vertical Trim
operation.
If
using continuous vertical trim
when the capture point is reached, the
capture will occur and vertical trim will
be ignored until released. After
release, further use of vertical trim will
cause the same effect as described
above.
Activating Discrete or Continuous
Vertical Trim has the following effect
upon flight director operations:
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