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 (d) Utilization in takeoff or go around phase (Ref. Fig. 035)
 1 Arming of CLB mode
_ On the ground, before takeoff, the CLB mode is armed as soon as the pilot selects a flight plan via the MCDU. During takeoff, the support mode is Pitch Takeoff which ensures guidance at the AP/FD up to the acceleration altitude. In these conditions, the ALT ACQ mode is also armed but is not displayed on the FMA. The CLB mode is not armed if an altitude constraint susceptible of being met or the altitude selected on the FCU appears in the flight plan at an altitude lower than the acceleration altitude. In these conditions, the armed mode displayed on the FMA is ALT ACQ. In go around phase, arming of the CLB mode obeys the same rules as in the takeoff phase. The only difference is that the CLB mode armed appears only when the Pitch-Go-Around mode is engaged on the AP/FD.
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_ When the aircraft reaches the acceleration altitude with the CLB mode armed, the FM part commands the activation of the climb phase. This results at level of the AP/FD in the activation: - of the CLB mode if the automatic level-change control can be
 engaged and particularly if the NAV mode is active on the
 AP/FD (lateral mode)
 - of the OPEN CLB mode in the other cases, particularly if the HDG/TRK mode is active on the AP/FD (lateral mode) or if the heading preset value is selected.
 The managed speed control selected in takeoff and go around phases commands the acceleration towards the climb-phase optimum speed. If the FCU level or the first altitude constraint is lower than the acceleration altitude, the acceleration and climb phases are started upon engagement of the ALT ACQ mode and the aircraft accelerates in level flight.
 3 Speed preset for the climb phase
_ The pilot can preset a speed value for the climb phase when he does not want to use the optimum speed of the automatic speed control. This preset value is introduced on the CLB page of the MCDU then displayed on this page and on the FMA with the CLB armed message. When the acceleration altitude is reached, the manual speed control is automatically selected. The preset value is synchronized in the FCU SPD window and then becomes the new target speed for the acceleration and climb phase.
 NOTE : The same procedure enables the pilot to preset a Mach
____ value for the cruise phase. The Mach preset is displayed on the FMA adjacent to the ALT mode armed when the aircraft flies the segment preceding activation of the cruise phase (Ref. 22-70-00 Flight Management System).
 (e) Elaboration of orders (Ref. Fig. 036) The control law, flight path, vertical speed and Speed/Mach principles have been described previously. When the selected guidance is V.PATH/SPEED or V.PATH/THRUST, the AP/FD orders are elaborated by the vertical path follow-up law.
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 Loss of Managed Level Change Prompted by Loss of Managed Lateral Control

 Figure 033
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 DES Mode Disengagement When Climb Phase is Activated
 Figure 034

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 CLB Mode in Takeoff Phase
 Figure 035

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 Vertical Path Control Law
 Figure 036
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 (f) Operational logic
 1 CLB mode armed
_ The climb mode is armed: - on the ground or when the takeoff and go around modes are
 engaged, provided that the conditions below are met: . no mode active except the takeoff or go around mode . the FCU level or the lowest FMS constraint likely to be respected is above the acceleration level defined (with NAV mode active or armed) . the acceleration level is valid
 -in flight, except during the descent and approach phases and on condition that: . the NAV mode is active . the FCU level is higher than the aircraft level . the flight profile is valid and one of the following conditions below is met: .. capture of an altitude constraint provided by the FMS .. push action on the altitude selector knob with ALT ACQ mode, ALT mode or ALT submode of the V/S - FPA mode active and provided that the FM permits arming of CLB mode.
 NOTE : The climb mode is disarmed by one of the conditions
____
 below:

 -conditions for arming the climb mode on the ground or in takeoff and go around modes not met
 -engagement of the V/S, FPA, EXP (if fitted), CLB, DES, GS CAPTURE, OPEN CLB, OPEN DES, ALT ACQ (FCU level) modes
　
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