Lift compensation is also provided as a function of flap
position and transitions.
This is accomplished to minimize
I
aircraft pitch attitude changes
due to the aerodynamic lift
changes induced through the deployment of flaps.
3. B. (8) (b) Vertical Speed (VS) Hold Mode (See Figure 260, sheet 2.)
Activation of the VS pushbutton on the GP-820 selects the
VS hold
mode and overrides all active pitch F/D modes. The
vertical speed hold mode is annunciated on the PFD by a
green VS.
In the VS hold mode, all armed pitch F/D modes are allowed, but
the capture of any armed pitch mode will override the mode. To
allow the initiation or the continuation of the mode, the
selected DADC must be valid.
The vertical speed hold mode is used to automatically maintain
the aircraft at a pilot selected vertical speed reference. The
value set with the VERT SPEED knob on the GP-820 Flight
Guidance Controller is displayed on the GP-820 and PFD. To
initiate the mode, the pilot would maneuver the aircraft to the
desired climb or descent attitude, establish the vertical speed
reference, and engage the mode. The reference vertical speed
may be changed by use of the VERT SPEED knob or by pressing the
TCS button on the control wheel and maneuvering the aircraft to
a new vertical speed reference and then releasing the TCS
button.
Prior to mode engagement,
altitude rate (VS) information,
provided by the AZ-81O DADC through the ASCB, is fed to a
summing point where it is compared to selected vertical speed.
Should a difference between these signals occur, the difference
is TAS
gain programmed and routed as a VS command signal to
Figure 260, sheet 7.
TAS gain programming accurately adjusts
the VS command signal as a function of the aircraft’s current
speed and barometric altitude. The VS command signal will
drive the flight director pitch command cue on the PFD in the
proper direction to fly the aircraft back to the pilot
selected vertical speed.
As the aircraft returns to the
reference vertical speed, the VS command will decrease towards
zero.
The aircraft has now returned to the selected vertical
speed reference.
For discussion of the vertical speed command
signal as it is processed on Figure 260, sheet 7, refer to
paragraph 3.B.(8)(i).
22-14-00
Page 298.110
Apr 15/93
Useor disclosure of information on this page issubject totherestrictions on the title page of this document.
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