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system predicts a level-off at a constraint that is achieved prior to reaching the FCU altitude.
The PFD target altitude depends on the barometer setting :
‐ If “STD” is selected, the target is a flight level.
‐ If “QNH” or “QFE” is selected, the target is an altitude or a height.
The aircraft will level off accordingly.
Note: If the pilot changes the barometer pressure during ALT* or ALT CST*, the aircraft may
overshoot the target altitude, because the current value has been changed. However, the
ALT* and ALT CST* modes allow the aircraft to regain the FCU altitude.
As a general rule, avoid changing the barometer setting when in ALT* or ALT CST*.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - EFFECT OF BARO REFERENCE SETTING
A330/A340 FLEET DSC-22_20-60-10 P 3/4
FCOM 19 AUG 10
NOTE FOR AIRCRAFTWITH QFE (FIELD ELEVATION PRESSURE) PIN PROGRAM
Applicable to: ALL
If QFE is selected on the EFIS control panel :
The MCDU predictions follow the basic rules (altitudes are ‐ AMSL below the transition level, flight
levels above it).
‐ The altitude constraints on the MCDU follow the basic rules.
‐ The target altitude on the PFD is QFE related :
• If the target altitude has been selected by the FCU, the aircraft will level off there.
• If the target altitude is an altitude constraint, the PFD automatically shows that constraint as
corrected by the airport elevation.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - EFFECT OF BARO REFERENCE SETTING
Intentionally left blank
A330/A340 FLEET DSC-22_20-60-10 P 4/4
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - PROCEDURES
A330/A340 FLEET DSC-22_20-60-20 P 1/2
FCOM 19 AUG 10
PROCEDURES
Applicable to: ALL
a. The altitude constraints in departure and arrival procedures should be defined in the navigation
database or by the pilot on the MCDU :
‐ in terms of altitude AMSL below the transition altitude
‐ in terms of flight level above the transition altitude
If a departure procedure defines an altitude constraint as an AMSL altitude above the transition
altitude, you must convert it to flight level, because the system and guidance will treat it as a flight
level whenever you select the standard barometer setting.
b. In climb you should switch from QNH (or QFE) to STD on both EFIS control panels simultaneously
when you reach the transition altitude.
All MCDU altitude predictions and altitude constraints and all PFD altitude targets will be displayed
as flight level.
c. In descent, when ATC clears you to an altitude below the transition altitude, you can select QNH
(or QFE) on both EFIS control panels simultaneously.
All MCDU altitude predictions and constraints and PFD targets are now altitude AMSL.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - PROCEDURES
Intentionally left blank
A330/A340 FLEET DSC-22_20-60-20 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - CLEAR KEY (CLEARING FUNCTION)
A330/A340 FLEET DSC-22_20-60-30 P 1/2
FCOM 19 AUG 10
CLEARING THE SCRATCHPAD OF DATA OR MESSAGES
Applicable to: ALL
Press the “CLR” key with a single brief touch to erase the last alphanumeric character inserted in the
scratchpad.
Press the key for more than three seconds to erase all the data inserted in the scratchpad. If the
scratchpad is empty, it displays “CLR”.
CLEARING DATA FIELDS
Applicable to: ALL
From a empty scratchpad, press the CLR key, then select the prompt for the field you want to clear
(3L for example).
‐ You cannot clear all data fields :
• If the field contains data that has a default value or a value computed by the FMGEC, the data
reverts to this value.
• Any attempt to clear the defaulted value has no effect.
‐ Clearing a constraint on the F-PLN A page deletes both the speed constraint and the altitude
constraint associated with the waypoint.
‐ If you clear a data field that is a waypoint in the flight plan (primary or secondary) you delete this
waypoint from the flight plan and create a discontinuity. The discontinuity can also be cleared in a
similar way.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
　
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