Speed Preselection for Climb Phase
Figure 029
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Manual Speed Selection - Effect on Predictions
Figure 030
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 22-73-00Page 67/68 1201-212, 1Config-1 May 01/05 1 1 1CES If the A/C speed gets 5 kts above target speed, the aircraft diverges from the descent profile maintaining selected speed on elevator and idle thrust ; Descent path control is recovered if the aircraft reintercepts the profile. (Ref. Fig. 031, 032)
-If there is no Manual speed preselected for CRUISE phase, the message SET SPEED AUTO is displayed on the MCDU and the PFD upon transition to CRUISE. (Ref. Fig. 033)
-30 seconds prior to a deceleration required for an HM leg (if the FCU selected speed is greater than the holding speed precomputed by the system), the message SET HOLD SPEED is displayed on the PFD and MCDU.
(4)
VERTICAL MANUAL CONTROL - Specific Rules VERTICAL MANUAL CONTROL means that either V/S, FPA, OPEN CLB, OPEN DES, EXP CLB or EXP DES mode (if EXP function is fitted) is engaged.
(a)
Effect on predictions There is no effect on MCDU flight plan predictions which do not take VERTICAL MANUAL CONTROL into account.
(b)
Effect on guidance
-V/S, FPA, OPEN CLB, OPEN DES modes: Speed target is determined by the system if SPEED AUTO CONTROL is active: it is then equal to the ECON speed or holding speed. (Ref. Fig. 034)
-EXP CLB or EXP DES mode (if pushbutton switch is fitted): The speed target is always determined by the FM as described in Para.B. when either mode is engaged. (in EXP CLB: max (VMAN, VLS); in EXP DES: min (VMAX, VMO-10, MMO-0.02)). (Ref. Fig. 035)
(5)
LATERAL MANUAL CONTROL - Specific Rules LATERAL MANUAL CONTROL means that either HDG, TRACK or RWY mode is engaged.
(a)
Effect on predictions Predictions always assume an immediate return to the lateral flight plan with a 45 deg. intercept law. Assumptions are as described for LATERAL AUTO CONTROL.
(b)
Effect on guidance
-CLB, DES or FINAL mode is not available in LATERAL MANUAL CONTROL
-V/S, FPA, OPEN CLB, OPEN DES mode:
DES Mode in SPEED MANUAL CONTROL : Aircraft on Profile
Figure 031
DES Mode in SPEED MANUAL CONTROL : Aircraft above Profile
Figure 032
Display of SET SPD AUTO Message in Case
of no Manual Speed Preselection for Next Phase
Figure 033
V/S in Descent (Aircraft above Profile)
Figure 034
INTENTIONALLY BLANK
1 1
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Expedite in Climb
Figure 035
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 22-73-00Page 75/76 1201-212, 1Config-1 May 01/05 1 1 1CES If speed auto control is active, the target speed is the optimum speed limited by speed limit when applicable (speed and time constraints are not considered since they are related to the lateral path).
-EXP CLB or EXP DES mode: The speed target is always determined by the FM when either mode is engaged. (in EXP CLB: max (VMAN, VLS); in EXP DES: min (VMAX, VMO-10, MMO-0.02)).
-During Descent and Approach phases, the FMS computes the required distance to land (DIST TO LAND), the direct distance to destination (DIST TO DEST) for display on the PROGRESS page.
Required distance to land:
It is the distance required to pass from the A/C present energy
state to the landing energy state (with respect to speed limit
and final deceleration).
Distance to destination:
It is equal to the distance from the A/C present position to
the LOC capture point (LCP) + distance from the LCP to the
runway threshold. In case of non ILS approach, the LCP is
replaced by the next to last approach waypoint.
(Ref. Fig. 036, 037)
Required Distance to Land - Distance to Destination
Figure 036
LATERAL MANUAL CONTROL in Descent
Figure 037
D. Other Computations
(1) GW, FOB and CG Revision Rules The Gross Weight, the Fuel On Board and the Center of Gravity are displayed on the FUEL PRED page. (Ref. Fig. 038) These parameters correspond to current values. GW, FOB and CG are also used as initial conditions for all performance and prediction computation before engine start (if it is not available, no GW is used by default). The following references are used: ZFW = Zero Fuel Weight (displayed before engine start) ZFWCG = Center of Gravity of ZFW (displayed before engine start) FOBCG = Center of Gravity of FOB (function of FOB) CG = Center of Gravity of GW (displayed after engine start) TOGW = Takeoff Gross Weight (displayed before engine start). The following equations are always verified:
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