6. C. (8) (b) Automatic Vspeed (AUTO VSPD) Mode Operation - The power-up
default for Vspeed selections is to the AUTO VSPD mode. In
this mode, Vspeed information is automatically displayed on the
display controller from the FMS performance computer. The
source of this data is the on-side FMS except when the
cross-side FMS is selected as the active navigation source on
the NAV menu. The source of the Vspeed information is
displayed on the DC menu as an AUTO VSPD1 or 2 as appropriate.
If the Vspeed data is valid, and the aircraft configuration
matches the selections made during FMS performance
initialization, the Vspeed information is boxed and displayed
appropriately on the PFD.
After takeoff, VREF is automatically
selected by the FMS for display (takeoff Vspeeds are deselected
at this time).
If the data is invalid, the digital readout on the DC menu is
shown with dashes. If the aircraft configuration does not
match the performance computer configuration, the Vspeeds are
displayed with an asterisk but are not boxed on the menu. Both
conditions will result in the amber VSPD annunciation.
Selection of any line select key adjacent to a Vspeed will
cancel the AUTO VSPD mode on both pilot and copilot DCS. The
values remain displayed and can set manually as discussed in
paragraph 6.C.(8)(C).
(c) Manual Vspeed Set Function - The first selection of a line key
causes reverse video to appear around the parameter. The value
can then be set between the ranges of 80 and 250 knots. The DC
allows the values to be set and displayed with the following
restrictions:
. The Vspeed order is always maintained as follows:
- VI, VR, V*, vF~,v~E
. VI can never be set higher than V~, and V~ can never be set
lower than V1.
. Vz can never be set any closer to V~ than 4 knots.
● VF~ can never be set any closer to V2 than 4 knots.
● V~E can never be set any closer to V~~ than 4 knots.
● VREF
set for display cancels (unboxed) all other displayed
Vspeeds.
● Displayed V~EF
is cancelled (unboxed)with the selection for
display of any one of the other Vspeeds.
. Vspeeds are settable from either
side DC.
22-14-00
Page 187
Aug 15/91
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