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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*.
‐ In aircraft equipped to use field elevation pressure (QFE option), switching from STD
to QFE (or vice versa) in ALT CST* green changes the target value and may revert the
vertical mode into V/S mode.
QFE
NOTE FOR AIRCRAFT WITH QFE (FIELD ELEVATION PRESSURE) PIN PROGRAM
If you select “QFE” 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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - EFFECT OF BARO REFERENCE SETTING
A318/A319/A320/A321 FLEET DSC-22_20-60-10 P 5/6
FCOM 19 AUG 10
TARGET ALTITUDE ON PFD
Applicable to:
,
,
MSN,,
4538,,
GENERAL
The PFD target altitude may either be :
‐ The altitude selected on the FCU, or
‐ A flight management altitude constraint, if the climb mode or descent mode is engaged and the
system predicts a level-off at a constraint that comes before 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 height.
The aircraft will level off accordingly.
QFE
NOTE FOR AIRCRAFT WITH QFE (FIELD ELEVATION PRESSURE) PIN PROGRAM
If you select “QFE” 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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - EFFECT OF BARO REFERENCE SETTING
A318/A319/A320/A321 FLEET DSC-22_20-60-10 P 6/6
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - PROCEDURES
A318/A319/A320/A321 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 STD, 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 levels.
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 contraints and PFD targets are now altitude AMSL.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - PROCEDURES
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-22_20-60-20 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - CLEAR KEY (CLEARING FUNCTION)
A318/A319/A320/A321 FLEET DSC-22_20-60-30 P 1/4
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
　
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