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‐ The FCU selected altitude is lower than the present aircraft level
The FCU selected altitude is set at the altitude constraint while ‐ ALT CST* or ALT CST mode is
engaged
‐ The aircraft transitions to DES or APPR phase
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - CLIMB MODE
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FCOM 19 AUG 10
‐ Arming requirements are no longer met
‐ Vertical flight path validity is lost, or NAV mode is lost while ALT CST*, ALT CST, ALT* or ALT
mode is engaged.
ENGAGEMENT CONDITIONS
Applicable to: ALL
The CLB mode can be engaged, if the following conditions are all met:
‐ The aircraft has been in flight for more than 5 s
‐ The selected FCU level is above the present aircraft level
‐ The descent, approach, or go-around phase is not active
‐ NAV mode is engaged
‐ Glideslope (G/S) mode is not engaged.
CLB mode automatically engages when the aircraft reaches ACC ALT, or sequences a waypoint with
an altitude constraint while the CLB mode is armed.
CLB mode manually engages when the flight crew pushes in the ALT knob, with the CLB mode not
armed and the current altitude is not an effective altitude constraint of the flight plan.
Note: When CLB mode is engaged:
‐ The V/S (FPA) window of the FCU shows dashes
‐ The managed LVL/CH dot on the FCU lights up
‐ The Flight Mode Annunciator displays “CLB” in Column 2.
DISENGAGEMENT CONDITIONS
Applicable to:
The CLB mode disengages, if one of the following conditions is met:
‐ NAV mode is lost or disengaged (OP CLB engages)
‐ Another vertical mode engages
‐ The flight crew selects an altitude on the FCU that is lower than the present aircraft altitude.
V/S (FPA) engages on the current V/S (FPA).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - CLIMB MODE
A330/A340 FLEET DSC-22_30-70-20 P 3/6
FCOM 19 AUG 10
DISENGAGEMENT CONDITIONS
Applicable to: ,
The CLB mode disengages, if one of the following conditions is met:
NAV mode is lost or disengaged (OP CLB engages). In ‐ this case, the reversion to OP CLB is
accompanied by a triple click aural warning
‐ Another vertical mode engages
‐ The flight crew selects an altitude on the FCU that is lower than the present aircraft altitude.
V/S (FPA) engages ong the current V/S (FPA).
GUIDANCE
Applicable to: ALL
Climb mode guides the aircraft up to the FCU selected altitude. It tries to respect speed and altitude
constraints. The AP/FD pitch controls the speed or Mach number target while the A/THR controls the
thrust set at maximum climb thrust.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - CLIMB MODE
A330/A340 FLEET DSC-22_30-70-20 P 4/6
FCOM 19 AUG 10
When climb mode is engaged (always associated with lateral NAV mode):
‐ The system takes into account all constraints either defined by the database, or manually entered
by the flight crew
‐ The system arms ALT mode and displays the next applicable altitude target on the PFD altitude
scale.
• ALT is magenta on the FMA second line and the altitude value is displayed in magenta on the
PFD scale if the next altitude target is a constraint
• ALT is blue on the FMA second line and the altitude value is displayed in blue on the PFD
altitude scale if the next altitude target is the FCU selected altitude. In climb mode, the system
does not modify the target speed to match the altitude constraints. The flight crew has to select
it manually using the information displayed on the PROG page.
When the aircraft levels off at an altitude constraint, CLB mode arms. It will engage automatically
when the waypoint is sequenced. (If the FCU selected altitude is above the constraint).
Note: Nevertheless this mode has the following particularity: When, in climb mode, the system
predicts it will miss an altitude constraint, the system will not modify the target speed. In this
case, the flight crew may select an appropriate speed, in order to meet the ALT CSTR.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - CLIMB MODE
A330/A340 FLEET DSC-22_30-70-20 P 5/6
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - CLIMB MODE
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FCOM 19 AUG 10
A330/A340 FLIGHT CREW
　
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