OPEN DES Mode - Mode Selection When ALT SEL < Current Alitude
Figure 026
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SPD/Mach Control Law
Figure 027
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R 2_ Operational use
R a Engagement_
R (Ref. Fig. 028)
R The expedite mode can be engaged through action on the
R EXPED pushbutton switch on the FCU on condition that :
R - the level selected on the FCU differs from the aircraft
R level,
R - the target speed delivered by the FM part is available.
R The engagement of the EXP mode commands the selection of
R the automatic speed control and acceptance of the target
R speed delivered by the FM part which will be:
R - the maneuvering speed in climb,
R - the maximum operating speed in descent.
R These speeds are computed by the FAC depending on the
R aircraft weight and balance and slat and flap
R configuration.
R The choice between the EXP CLB or EXP DES mode is based on
R the aircraft position with respect to the FCU level.
R (Ref. Fig. 029)
R With this mode engaged, the altitude constraints imposed by
R the FMS are not taken into account and the following
R appears on the FCU:
R - the light for automatic change control is off
R - the green bars on the EXPED pushbutton switch are on
R - the light for automatic level change control is on.
R b Disengagement_
R The EXP mode can be disengaged:
R - through pull action on the speed selector knob which
R switches the speed control to manual mode and engages the
R OPEN CLB or OPEN DES mode.
R (Ref. Fig. 030)
R This logic is also applicable to the takeoff and go around
R modes.
R When these modes are active, the guidance is essentially
R dependent on the target speed of the automatic speed
R control.
R The guidance can then no longer be ensured if the manual
R speed control is selected through engagement of any other
R longitudinal mode.
R 3_ Elaboration of orders
R In EXP mode, the AP/FD orders are elaborated by the SPD/Mach
R law.
R The A/THR operates in THRUST mode and commands a fixed thrust.
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EXP Mode - EXP CLB When Aircraft Altitude < Selected Altitude
Figure 028
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EXP Mode - EXP DES When Aircraft Altitude > Selected Altitude
Figure 029
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EXPED Mode - Disengagement by Selected Speed Selection
Figure 030
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1 1EFF : ALL 1 22-12-00Page 73 1 1 Feb 01/05 1 1 1CES 1 Whatever the guidance selected, the target parameter values (thrust, flight path angle, vertical speed, longitudinal path, Speed/Mach in automatic speed control) are determined by the FM part. Only the speed or Mach can be imposed by the pilot if manual speed control is selected. In automatic speed control, the target speed and Mach are the optimum speed and Mach values computed as according to
R 4 Operational logic_
R The EXP mode is engaged through action on the EXPED pushbutton
R switch of the FCU and on condition that:
R - the aircraft has been flying for at least 5 seconds or is on
R the ground with engines shut down,
R - the ALT ACQ mode can be armed,
R - the LAND TRACK mode is not active.
R The EXP mode is active only with the automatic speed control.
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