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lateral and vertical flight plans.
Applicable to: ALL
ON THE GROUND
The altitude predicted at each waypoint is displayed as altitude in feet above mean sea level
(AMSL) when it is below the transition altitude and as flight level when it is above the transition
altitude. The altitude constraints are also displayed, and they follow the same rule (feet or flight
level).
The predicted altitude is equal to the airport elevation plus the height you must attain in order to
reach the waypoint in the applicable mode (climb or descent).
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 2/6
FCOM 19 AUG 10
Applicable to:
IN FLIGHT
The predicted altitude is equal to the aircraft altitude (as a function of the barometer setting),
plus or minus the height you must attain to reach the waypoint in the applicable mode (climb or
descent).
‐ In climb :
Altitude predictions and constraints are displayed as altitude in feet above mean sea level
(AMSL) at, or below, the transition altitude, and as the flight level above it.
For example : If the transition altitude is 5 000 ft and you insert an altitude constraint as 8 000 ft,
the MCDU F-PLN A page displays it as FL 80.
‐ In descent :
If “STD” is selected on the EIS control panel, altitude predictions and constraints above the
transition level are displayed as flight levels, and those below the transition level are displayed
as altitude AMSL.
If sea level standard pressure (QNH), or field elevation pressure (QFE option), is selected on
the EIS control panel, altitude predictions and constraints are displayed as altitudes AMSL,
regardless of the transition altitude.
For example : If the transition level is FL 50 and you insert an altitude constraint of 8 000 ft
into the MCDU, the MCDU F-PLN A page will display it as FL 80, if “STD” is selected, and as
8 000 ft, if “QNH” (or “QFE” option) F-PLN A page is selected.
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 3/6
FCOM 19 AUG 10
Applicable to:
,
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MSN,,
4538,,
IN FLIGHT
The predicted altitude is equal to the aircraft altitude (as a function of the barometer setting),
plus or minus the height you must attain to reach the waypoint in the applicable mode (climb or
descent).
‐ In climb :
Altitude predictions and constraints are displayed as altitude in feet above mean sea level
(AMSL) at, or below, the transition altitude, and as the flight level above it.
For example : If the transition altitude is 5 000 ft and you insert an altitude constraint as 8 000 ft,
the MCDU F-PLN A page displays it as FL 80.
‐ In descent :
If “STD” is selected on the EIS control panel, altitude predictions and constraints above the
transition level are displayed as flight levels, and those below the transition level are displayed
as altitude AMSL.
If sea level standard pressure (QNH), or field elevation pressure (QFE option), is selected on
the EIS control panel, altitude predictions and constraints are displayed as altitudes AMSL,
regardless of the transition altitude.
For example : If the transition level is FL 50 and you insert an altitude constraint of 8 000 ft into
the MCDU, the MCDU F-PLN A page will display it as FL 80, if “STD” is selected. If “QNH” (or
“QFE” option) is selected, the MCDU F-PLN A page will display the barometric corrected altitude
constraint.
TARGET ALTITUDE ON PFD
Applicable to:
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.
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 4/6
FCOM 19 AUG 10
The aircraft will level off accordingly.
Note: If the pilot changes the barometer setting during ALT* ‐ or ALT CST*, the aircraft may
　
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