Takeoff
Figure 011
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Predicted CLIMB Profile
Figure 012
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_
a CLB mode
_ It can be armed or engaged in LATERAL AUTO CONTROL, below FCU selected altitude. It is normally armed when CLIMB phase becomes active, and it engages at once unless there is an altitude constraint at acceleration altitude. When a level off is required for an altitude constraint, ALT ACQ mode is engage automatically and CLB mode is armed for automatic re-engagement when the constraint is passed. (Ref. Fig. 013) When CLB mode is engaged, SPEED-THRUST submode is selected: speed is held with the elevators and maximum available thrust is targeted.
b SPEED AUTO CONTROL
_ The speed target is the ECON climb speed. In LATERAL MANUAL CONTROL, only the climb speed limit is observed. (Ref. Fig. 014) In LATERAL AUTO CONTROL, speed and time constraints, ICAO limits and holding pattern speeds are also observed. The speed target can be a CAS or a MACH, depending on aircraft altitude relative to the corresponding AUTO crossover altitude.
(d) Cruise (Ref. Fig. 015)
1 Predictions
_ Cruise predictions are based on the aircraft flying level at the cruise altitude using the appropriate thrust to maintain the optimum cruise speed. If a step climb or descent exists in the F-PLN, it is taken into account in the cruise predictions. Steps are assumed to be flown maintaining step speed and:
-
for step descent : - 1000 ft/mn
-
for step climb : Max climb thrust.
When the aircraft is not in level flight at the cruise flight
level, it is assumed to be flying a step.
2 Guidance
_
a FM vertical modes
_ CLB or DES mode can only be engaged manually, in LATERAL AUTO CONTROL, respectively below or above FCU selected altitude. Mode arming is not possible. Engagement of CLB mode initiates a step-climb. Engagement of DES mode
initiates a step-descent if a step exists in the flight plan or if the destination is far away, otherwise transition to DESCENT phase occurs.
-
if CLB mode is engaged, SPEED-THRUST submode is selected: speed is held with the elevators and maximum available thrust is targeted
-
if DES mode is engaged for a step-descent, V/S-SPEED submode is selected: V/S = -1000 ft/mn is held with the elevators and speed is held with thrust.
b SPEED AUTO CONTROL
_ The speed target is the ECON cruise speed, limited to the climb speed limit when applicable (in LATERAL AUTO CONTROL, a time constraint is taken into account). It is continuously updated according to current flight conditions.
-
in level flight at the cruise flight level, it is a MACH above FL250, otherwise it is converted to a CAS
-
in level change from one cruise flight level to another, it can be the CAS of the lower cruise flight level, or the MACH of the higher one, depending on aircraft altitude relative to the corresponding AUTO crossover altitude
-the DECELERATE message is displayed beyond the top of descent.
(e) DESCENT phase
1 Descent parameters
_ (Ref. Fig. 016) The following atmospheric data must be entered since they are used for descent path construction and for predictions during descent and approach:
-cabin rate (on the DES FORECAST page) is used for repressurization segment construction (the default value is -350 ft/mn)
-descent winds (on the DES FORECAST page) and the destination wind (on the PERF APPR page) are used for path construction; destination wind is also used to compute VAPP. It is also used by the FG for approach speed management
-
destination temperature (on the PERF APPR page) is used to compute the Delta ISA for the descent
-
destination QNH (on the PERF APPR page) is used to compute a cabin rate and is transmitted to the cabin pressure control system for cabin pressure management.
Level off for an Altitude Constraint
Figure 013
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Climb - Crossing the Speed Limit Altitude
Figure 014
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Step Climb
Figure 015
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Display of Descent Parameters
Figure 016
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