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The AP/FD climb modes may be either
? Managed
? Selected
MANAGED
The managed AP/FD mode in climb is CLB. Its use is recommended as long as the aircraft is cleared along the F-PLN.
SELECTED
The selected AP/FD modes in climb are OP CLB or V/S.
OP CLB is to be used if ATC gives radar vector or clears the aircraft direct to a given FL without any climb constraints.
If the crew selects a high V/S, it may happen that the aircraft is unable to climb with this high V/S and to maintain the target speed with Max Climb thrust, for performance reasons. In that case, the AP/FD will guide to the target V/S, and the ATHR will command up to Max Climb thrust, in order to try to keep the target speed; but the aircraft will decelerate and its speed might reach VLS. When VLS is reached the AP will pitch the aircraft down so as to fly a V/S, which allows maintaining VLS.
NORMAL OPERATIONS
CLIMB
In this case, the V/S indication on the FMA pulses and is boxed amber. A triple click is generated (if triple click option is available)
Whenever V/S is used, pilots should pay particular attention to the speed trend as V/S takes precedence over speed requirements.
The crew should be aware that altitude constraints in the MCDU F-PLN page are observed only when the climb is managed, i.e. when CLB is displayed on the FMA. Any other vertical mode will disregard any altitude constraints.
A likely scenario would be, when the FCU altitude is set above an altitude constraint and the pilot selects V/S when below that constraint to avoid a potential TCAS TA. In this case, the aircraft will disregard the altitude constraint.
SMALL ALTITUDE CHANGES
Applicable to: ALL
CLB or OP CLB mode will be preferred to VS mode for climb even for small altitude changes. Indeed, in the small altitude change case, the THR CLB mode is limited in order to give 1000 fpm making this altitude change smoother and more comfortable for the passengers.
SPEED CONSIDERATIONS
Applicable to: ALL
The climb speed may be either:
? Managed
? Selected
MANAGED
The managed climb speed, computed by the FMGS, provides the most economical climb profile as it takes into account weight, actual and predicted winds, ISA deviation and Cost Index (CI). The managed climb speed also takes into account any speed constraints, e.g. the default speed limit which is 250 kt up to 10 000 ft.
SELECTED
If necessary, the climb speed can be either pre-selected on ground prior to take-off on the MCDU PERF CLIMB page or selected on the FCU as required.
On ground, prior take-off, speed target at acceleration altitude can be pre-selected on the MCDU PERF CLIMB page. It is to be used when the F-PLN has a sharp turn after take-off, when high angle of climb is required or for ATC clearance compliance.
Once airborne, the speed can be selected on FCU to achieve the maximum rate of climb or the maximum gradient of climb.
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A330/A340 机组训练手册 FCTM Flight Crew Training Manual 1(50)
