OPERATOR’S MANUAL
CMA-9000 FLIGHT MANAGEMENT SYSTEM
To perform a Late Descent:
1. Lower the FGCP selected altitude below the cruise altitude. The FMA displays ALT in g
2. Engage VNAV mode through the FGCP VNAV pushbutton. The FMA displays VNAV in
The VNAV mode of the Autopilot system will engage and the airplane will start descending. Th
to Late Descent mode and commands acceleration to a
reen;
green.
e FMS transitions
speed that is higher than the planned descent target
VDEV becomes less than 150 feet, the FMS
transitions to descent mode and maintains the descent target speed.
pects all waypoint speed constraints.
putation of the descent trajectory. Consequently, when a flight plan
change is EXEC-uted, a VDEV jump may occur.
1.8.6 Descent Situational Awareness
Vertical Deviation is normally computed as the difference between the aircraft altitude and the predicted altitude
wing leg type:
• For a hold that has an altitude constraint that is lower than the holding fix (entry) point,, VDEV is referenced
when sequencing to and
D ituational
a or the ground
d reference altitude at the current vertical speed:
g altitude, but any
The Vertical Bearing (V/B) and Vertical Speed (V/S) fields at [4R] display the estimated vertical bearing and
required vertical speed on a direct path from current aircraft position to the crossing altitude at the waypoint
displayed at [3R]. FPA corresponds to the current Flight Path angle of the aircraft. FPA and VDEV (if any) is
displayed at [5R] corresponds to the current Flight Path angle of the aircraft and any vertical deviation from
the computed path.
2. Press [3R] to toggle the display to the reference altitude. [3R] is filled by default with the current FGCP
selected altitude, but any altitude can be manually entered.
[4R] displays an estimate of the ground distance to reach the reference altitude under current conditions.
speed, in order to expedite convergence to the descent path. When
NOTE: During a late descent the FMS res
1.8.5 Impact of Flight Plan Changes
Any change to the flight plan causes re-com
1.8.6.1 Impact of Lateral Leg Type on Vertical Deviation
at the current position except for the follo
to the altitude constraint that terminates the hold. This can result in a VDEV jump
from these legs.
1.8.6.2 Descent Page [3R]/[4R][5R] Fields
ata fields [3R], [4R] and [5R] of the DES page provide the crew with quick-reference vertical s
wareness information regarding the aircraft’s present position relative to a selected waypoint
istance to reach a
1. [3R] is filled by default with the next altitude-constrained descent waypoint and crossin
on-route or off-route waypoint and altitude can be manually entered.
Page F-42
August 17, 2010
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