King Air C90GTi, Pilot Training Manual

Page: 372 / 557

FOR TRAINING PURPOSES ONLY
16-39
off by the autopilot or FD command. The
ALTS armed mode annunciates in white on
the PFD.
The altitude preselect mode is automatically
selected with the following: the ALT knob is
turned; go-around mode is cleared or the
flight director is turned on. Altitude prese-
lect is automatically deselected when glides-
lope approach mode becomes active, the
VNAV glidepath approach mode (VGP) be-
comes active, altitude hold mode is selected,
or the altitude capture mode (ALT CAP) is
annunciated.
If a descent or climb is desired, a new altitude
must be preselected. The appropriate vertical
mode must then be selected to climb or de-
scend. Changing the altitude preselector alone
does not cause the aircraft to climb or descend.
If the ALT knob is turned while ALT CAP is
annunciated, the pitch mode is selected and
the altitude preselect mode rearms.
Altitude capture (ALT CAP) occurs when the
airplane altitude approaches the selected alti-
tude. The capture point depends on the closure
rate. When within 1000’ of the selected alti-
tude a single aural tone will sound and the pre-
selected altitude will flash. The flashing will
stop when within 200’ of the selected altitude.
Should the aircraft subsequently deviate by
more than 200’ from the selected altitude the
single aural tone will sound and the prese-
lected altitude will flash yellow. The flashing
will stop with an input by the pilot (pressing
the altitude selector knob) or the aircraft re-
turns to within 200’ of selected altitude. In ei-
ther case the number will stop flashing and
return cyan in color.
ALTS shows in yellow if the capture is inhib-
ited due to invalid data and ALTS CAP shows
in yellow if the capture is cleared without a
subsequent selection of altitude hold or glides-
lope/glidepath capture.
ALT Preselect Knob
The ALT knob selects the desired altitude for
level off (displayed on the PFD). Rotating the
knob while in its default position will select
thousands of feet. Pressing the knob IN while
rotating will select hundreds of feet. See the
Altitude Display section of the PFD for more
information on the bugs that appear on the al-
titude tape.
PUSH CANCEL Button
The PUSH CANCEL button within the ALT
knob cancels the flashing visual altitude alerts
on the Altitude Display section of the PFD as
described earlier.
CONTROL WHEEL SWITCHES
The following control wheel switches affect
FGS operation:
DISC TRIM AP/YD Button
The DISC TRIM AP/YD button is located on
the outboard horn of each control wheel. It is
used for disengagement of the autopilot and
yaw damper (Figure 16-73). Pushing the but-
ton to the first detent will disconnect the au-
topilot and/or yaw damper. Pushing the button
to the second detent will interrupt electric trim
operation. Releasing the button will reset the
trim and allow continued operation.
Figure 16-73. Left Yoke
KING AIR C90GTi/C90GTx PILOT TRAINING MANUAL
16
A
VIONICS