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OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - OPEN CLIMB MODE
A330/A340 FLEET DSC-22_30-70-30 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The OPEN CLB mode is a selected mode. It uses the AP/FD pitch mode to maintain a SPD/MACH
(selected or managed) while the autothrust (if active) maintains maximum climb thrust.
ENGAGEMENT CONDITIONS
Applicable to:
The OPEN CLB mode can only be engaged, if all of the following conditions are met:
The aircraft ‐ is in flight for more than 5 s
‐ The LAND mode is not engaged
‐ The FCU selected altitude is higher than the aircraft’s present altitude.
The OPEN CLB mode is engaged, if one of the following conditions occurs:
‐ The flight crew pulls out the ALT knob
‐ The flight crew pulls out the SPD/MACH knob, when TOGA mode is engaged
‐ Acceleration altitude is reached, with CLB armed, and NAV mode not engaged
‐ Loss of NAV mode or vertical F-PLN when CLB mode is engaged (Refer to DSC-22_30-75
General).
ALT mode is systematically armed when OPEN CLB engages.
ENGAGEMENT CONDITIONS
Applicable to: ,
The OPEN CLB mode can only be engaged, if all of the following conditions are met:
‐ The aircraft is in flight for more than 5 s
‐ The LAND mode is not engaged
‐ The FCU selected altitude is higher than the aircraft’s present altitude.
The OPEN CLB mode is engaged, if one of the following conditions occurs:
‐ The flight crew pulls out the ALT knob
‐ The flight crew pulls out the SPD/MACH knob, when TOGA mode is engaged
‐ Acceleration altitude is reached, with CLB armed, and NAV mode not engaged
‐ Loss of NAV mode or vertical F-PLN when CLB mode is engaged. The reversion to OPEN CLB is
accompanied by a triple click aural warning (Refer to DSC-22_30-75 General).
ALT mode is systematically armed when OPEN CLB engages.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - OPEN CLIMB MODE
A330/A340 FLEET DSC-22_30-70-30 P 2/2
FCOM 19 AUG 10
DISENGAGEMENT CONDITIONS
Applicable to: ALL
The OPEN CLB mode is disengaged by one of the following conditions:
Engagement ‐ of any other vertical mode
‐ Selection of a lower altitude (on FCU) than the current aircraft altitude. V/S (FPA) engages on
current V/S (FPA) (Refer to DSC-22_30-75 General).
GUIDANCE
Applicable to: ALL
When OPEN CLB is engaged, the target speed/Mach is maintained by adjusting the pitch with the
elevator whereas thrust is maintained either by the A/THR, or manually by the flight crew. Speed may
be either selected or managed.
The OPEN CLB mode disregards all altitude constraints up to the FCU selected altitude.
Note: A level change of less than 1 200 ft in OPEN CLB mode with A/THR active produces a
1 000 ft/min climb.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A330/A340 FLEET DSC-22_30-70-50 P 1/14
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The DES mode guides the aircraft along the descent path computed by the FMGES. The system
computes this flight path backwards from the deceleration point up to the top of descent (T/D), with
respect to the speed and altitude constraints. At the deceleration point, the guidance begins the
deceleration to VAPP, to be reached at 1 000 ft above touchdown on the final descent path.
Internally, the computer divides the descent path into various segments, depending on the relative
positions of the constraints. It starts at top of descent (T/D) by setting up an “idle” segment that
takes the aircraft down to the first constraint, and follows this with “geometric” segments between
constraints.
The descent profile takes into account wind data and data from the lateral and vertical flight plans,
and it is based upon the managed descent speed profile. It does not take holding patterns into
consideration.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A330/A340 FLEET DSC-22_30-70-50 P 2/14
FCOM 19 AUG 10
The descent profile has several segments:
A repressurization segment. When necessary, this ‐ produces a repressurization rate for the cabin
during descent. It is a function of the destination airport altitude and the selected cabin rate
(defaulted to - 350 ft/min but this can be modified)
‐ Idle path segment. The AP/FD controls the speed and the autothrust stays at idle thrust. The
guidance computes this profile from top of descent or the end of the repressurization segment to
　
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