BOMBARDIER LEARJET 40 Pilot's Manual page 72

Pilot's Manual
AP (autopilot) button — Depressing this button engages the autopilot.
Depressing a second time disengages the autopilot.
XFR (transfer) button — Located in the center section of the FGC, the
XFR button is used to select the desired flight director (left or right) to
command the autopilot.
YD (yaw damper) button — Depressing this button engages yaw
damper. The YD can be engaged independent of the AP, but the auto-
pilot system will not engage, or remain engaged, without the YD.
SPD (speed) knob — The rotary SPD knob is used to change the IAS/
Mach speed reference (SPD mode) and the vertical speed reference (VS
mode). The speed knob changes the bug airspeed at any time, as long
as VS is not selected. When VS mode is engaged, rotation of the SPD
knob changes the digital vertical speed reference and the vertical speed
bug position. The integral PUSH IAS/M button within the SPD knob is
used to toggle the airspeed tape between IAS and Mach. The master
flight director computes the airspeed reference, and the slave flight di-
rector synchronizes to this reference.
SPD (speed) button — Depressing the SPD button engages the speed
hold mode (IAS or Mach) on both FDs. The speed select mode is used
to fly to a selected airspeed or Mach number, and to provide limited
overspeed/underspeed protection during climbs and descents. When
speed select mode is active, a green IAS or Mach annunciation is dis-
played in the captured vertical mode field on the PFDs.
FLC (Flight Level Change) button — Depressing the FLC button once
engages the normal climb/descent profile on both PFDs. Depressing it
a second time selects the high speed climb/descent schedule. A third
depression deselects the mode. The FD chooses between the climb and
descent schedule based upon the aircraft's present altitude and prese-
lected target altitude. The FD annunciation on the PFD is FLC for the
normal profile and FLCH for the high-speed profile.
VS (Vertical Speed) button — Depressing the VS button engages the
vertical speed hold mode on both FDs. When VS is selected, the speed
bug disappears and reference goes to dashes. The FD commands pitch
changes to hold the vertical speed that existed at the time of engage-
ment. Once engaged, the vertical speed bug positions on the inner side
of the vertical speed scale and a digital readout appears above the ver-
tical speed indicator.
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PM-132A