4. D. (1) (b) The current speed target observes placard speeds and minimum
speed, and is the lesser of the following:
I
● Flap or gear limit speeds
● V~O/MO
●
SDee$’limit below an altitude
● blaypoint constraint speeds
.
Speed schedule for phase of flight (climb, cruise, descent)
. Latched speeds
(c)
The FMS automatically changes the speed target throughout the
flight to accommodate aircraft configuration and phase of
flight.
This automatically controlled speed target is
available for use by the autopilot or autothrottle, independent
of VNAV being selected, for speed control as long as MAN is not
selected on the GP-820.
If
MAN is selected on the GP-820, the
pilot controlled speed is used by the autopilot or autothrottle
for speed control
when engaged.
The automatic
FMS speed target
for a typical flight is changed as follows:
● Prior to takeoff, the speed target is set to the placard
speed for the aircraft configuration.
. During initial climb,
as the gear and flaps are retracted,
the speed target is adjusted to the placard speed for
current configuration.
● Following aircraft cleanup, the speed target is set to 10
knots below the speed/altitude limit (250/10,000), if
entered, or the climb speed.
If a speed/altitude limit is
entered, the speed target is set to climb speed after
passing the limiting altitude.
● During climb, the speed target is the climb speed schedule
selected during initialization and the transition to
MACH is
accomplished automatically. This speed schedule is observed
during any intermediate level off.
. The speed target is changed to the cruise speed as the
autopilot transitions to ASEL
or VASEL before reaching the
cruise altitude.
. The cruise altitude can be manually entered on PERF INIT
page 4, or the FMS will automatically compute an optimum
cruise altitude if the
OPTIMUM option is used. However, the
cruise altitude will be set equal to the altitude
preselector should this be set higher than the entered or
computed altitude. Cruise altitude entries that are lower
than the preselector altitude will result in a
RESET ALT
SELECT message on the
CDU scratchpad and will not be
accepted. Once the performance initialization is completed,
the cruise altitude can also be entered directly on the PERF
DATA page 1. Entering DELETE on either of these two pages
has the effect of recomputing the optimum altitude. Once in
cruise, entries are ignored,
and the cruise altitude will
only be redefined when the altitude preselector is armed.
22-14-00
Page 298.212
Apr 15/93
Use or disclosure of information on thispage issubject to the restrictionson the titlepage of thisdocument.
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