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the FMA as the thrust levers are set to CL detent at the thrust reduction altitude. During the latter
stage of a climb to higher levels, the derate is progressively reduced to zero by the FADECs. Climb
performance will be reduced when using derated climb thrust but the ceiling will not be affected. The
crew may modify or cancel the level of derate at any stage through the MCDU PERF CLB page.
Should an engine failure occur during a derated climb, derated climb thrust is deselected by selecting
MCT.
The derated climb slightly increases fuel consumption and must be taken into account for fuel
quantity computation (Refer to FCOM/99 Duref Cible FCOM).
CLIMB THRUST
Criteria: LR
Applicable to: , , , , , , , , , , , ,
During the climb, the thrust levers are in the CL detent, the A/THR is active in thrust mode and the
FADECs manage the thrust to a maximum value depending upon ambient conditions.
AP/FD CLIMB MODES
Applicable to: ALL
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.
A330/A340 FLIGHT CREW TRAINING MANUAL
NORMAL OPERATIONS
CLIMB
A330/A340 FLEET NO-060 P 2/4
FCTM 17 JUN 09
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.
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.
A330/A340 FLIGHT CREW TRAINING MANUAL
NORMAL OPERATIONS
CLIMB
A330/A340 FLEET NO-060 P 3/4
FCTM 17 JUN 09
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.
The speed to achieve the maximum rate of climb, i.e. to reach a given altitude in the shortest time,
lies between ECON climb speed and green dot. As there is no indication of this speed on the PFD,
a good rule of thumb is to use turbulence speed to achieve maximum rate.
The speed to achieve the maximum gradient of climb, i.e. to reach a given altitude in a shortest
distance, is green dot. The MCDU PERF CLB page displays the time and distance required to
achieve the selected altitude by climbing at green dot speed. Avoid reducing to green dot at high
altitude, particularly at heavy weight, as it can take a long time to accelerate to ECON mach.
　
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