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DISARMING CONDITIONS
Applicable to: ALL
The CLB mode is disarmed, if one of the following conditions is met:
‐ Another vertical mode is engaged
‐ 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
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - CLIMB MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-20 P 2/4
FCOM 19 AUG 10
‐ Arming requirements are no longer met
‐ Vertical flight path validity is lost, or NAV mode is lost while ALT CST* or ALT CST 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).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - CLIMB MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-20 P 3/4
FCOM 19 AUG 10
DISENGAGEMENT CONDITIONS
Applicable to:
,
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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 on the current V/S (FPA).
GUIDANCE
Applicable to: ALL
Climb mode gives the aircraft managed vertical guidance to the FCU selected altitude. It meets
altitude constraints at waypoints either with managed speed incorporating speed constraints or with
selected speed as target speed. The AP/FD pitch controls the speed or Mach number target and the
A/THR is in thrust mode (CLB) corresponding to maximum climb thrust. The flight path may include
several segments.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - CLIMB MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-20 P 4/4
FCOM 19 AUG 10
When CLB mode is engaged, the system arms ALT and displays ‐ the applicable target altitude on
the ALT scale.
• If the next predicted level-off is an ALT CSTR, ALT is magenta on the FMA and the ALT CSTR
is displayed in magenta on the altitude scale
• If the next predicted level-off is the FCU altitude, ALT is blue on the FMA and the FCU selected
altitude is displayed in blue on the altitude scale.
Note: The system takes into account all constraints defined by the database or manually
entered by the flight crew. Nevertheless this mode has the following particularity: When
the aircraft is in CLB mode and the system predicts that it will miss an altitude constraint,
it will not modify the target speed in an attempt to meet it. In this case, the flight crew
may select an appropriate speed in order to meet the ALT CSTR.
‐ The guidance does not modify the target speed in order to satisfy an altitude constraint. Therefore
the constraint may not be met and may be predicted as missed
‐ When the aircraft levels off at the ALT CSTR, CLB mode arms automatically, then engages when
the aircraft passes the constrained waypoint (if the FCU altitude is above the constraint altitude).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - OPEN CLIMB MODE
　
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