OPEN CLB Mode - Mode Selection When ALT SEL > Current Altitude
Figure 023
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IN OPEN CLB Mode - V/S Mode Selection When ALT SEL < Current Altitude
Figure 024
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OPEN CLB Mode - V/S Demand Above Performance Capability
Figure 025
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Speed/Mach switching
In climb mode and manual speed control, the Speed-to-Mach
switching is automatic and commanded by the FM part, when the
aircraft reaches the switching altitude computed by the FM
part, depending on the selected speed.
The corresponding Mach value which corresponds to the
switching altitude and displayed on the CLB page of the MCDU
is synchronized in the SPD MACH window of the FCU display.
(Ref. Fig. 023)
Similarly, in descent mode when the aircraft reaches the
switching altitude, the FM part commands the change to speed
control, and the speed which corresponds to the Mach number
selected and to the switching altitude is synchronized in the
FCU window.
This automatic switching can be overridden by the pilot via
the related pushbutton switch on the FCU and on switching, the
window is synchronized with the aircraft Mach number or speed.
(Ref. Fig. 026)
Elaboration of orders
(Ref. Fig. 027)
The principle consists in splitting the aircraft total energy
into two parts:
-70% for acceleration or deceleration
-30% for climb or descent. The total flight path gamma T is the checking parameter. Upon engagement of the OPEN CLB mode and during establishment of the limit thrust to IDLE, the AP/FD guidance is ensured by the vertical speed law (Reference equal to + 8000 ft/mn). This type of guidance improves the load factor and speed hold performance during the thrust transient. In the cases below:
-A/THR disengaged or not active,
-deceleration commanded in climb,
The SPD/Mach law ensures AP/FD guidance as soon as the mode is
engaged.
Operational logic The OPEN CLB and OPEN DES modes can only be engaged if the conditions below are met:
-
the ALT ACQ mode can be armed
-
the aircraft is on the ground (engines stopped) or in flight for more than 5 seconds
-
the LAND TRACK mode is not active
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- the FCU level is above the aircraft level (engagement of
OPEN CLB mode) or below the aircraft level (engagement of
OPEN DES mode).
The OPEN CLB mode is activated if one of the conditions below
is met:
- pull action on the altitude selector knob
- with CLB or IM CLB mode active :
. switching to Descent, or
. Approach phase, or
. loss of NAV mode or loss of flight profile validity.
- Selection of the manual speed control, when in EXP, takeoff
or go around mode (Ref. EXP mode, if fitted)
- the acceleration altitude reached is an armed CLB mode on
condition that the NAV mode is not active or the flight
profile is not valid (Ref. CLB mode).
The OPEN DES mode is activated if one of the conditions below
is met:
- pull action on the altitude selector knob
- selection of manual speed control with the EXP mode engaged
(Ref. EXP mode).
Speed protection of the V/S FPA modes is engaged if the
following conditions are met :
- V/S Sel or FPA Sel >0 and speed lower than or equal to VLS +
5kts.
- or V/S Sel or FPA Sel <0 and speed greater than or equal to
VMAX - 5kts in clean configuration or VMAX +4kts in flap and
slat extended configuration.
NOTE : The speed protection is active 5 seconds after____
light-off but is inactive if a speed protection from
OPEN to V/S FPA mode occurred less than 30 seconds
before.
R (c) Expedite (EXP) mode
R 1 Characteristics_
R The EXP mode permits to perform level changes with the maximum
R flight path angle in climb as well as in descent.
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