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ESTIMATED TAKEOFF TIME (ETT)
Applicable to:
The Estimated Takeoff Time (ETT) may be entered by the pilot during the preflight phase at the
origin airport. This time is used as the initialization time for predictions.
The entry is accepted in the preflight phase, if the ETT is greater than the clock time.
PROCEDURE
PRESS the F-PLN key.
SELECT VERT REV at origin.
SELECT the RTA page.
WRITE the ETT into the scratchpad, and ENTER in the ETT field.
The display automatically reverts to the F-PLN A page.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - REQUIRED TIME OF ARRIVAL (RTA)
A318/A319/A320/A321 FLEET DSC-22_20-60-120 P 5/6
FCOM 19 AUG 10
Note: ‐ If the current time exceeds the ETT entry, the CLK IS TAKE OFF TIME message is
displayed ; the ETT is replaced by the clock time.
‐ At takeoff, the takeoff time is automatically updated using the actual clock time.
‐ An ETT entry is automatically deleted, if the origin airport is modified, or if the clock is
inoperative.
‐ If a time constraint is entered at a waypoint in the F-PLN, the takeoff time required to
match the constraint is automatically computed by the FM. This result is displayed in
magenta as ETT at the origin.
USE OF TIME/ETT CONSTRAINT
During preflight : ‐ If an ETT has been entered, time predictions are based on the
entered value (or clock time, if greater).
If both an ETT and a time ‐ constraint have been entered, time
predictions are based on the entered ETT value (or clock time, if
greater). The managed speed profile is computed to match the time
constraint, as closely as possible, using a pseudo cost index value.
(Not displayed).
‐ If only a time constraint has been entered :
• Optimum speeds are computed to determine the ETT, so as to
satisfy the time constraint.
• If necessary, flight time (based on optimum speeds) plus clock time
(current) is greater than the time constraint ; optimum speeds are
modified to match the time constraint as closely as possible.
After Takeoff : The predictions are based on the current time.
Speeds are adjusted to satisfy the time constraint.
ESTIMATED TAKEOFF TIME (ETT)
Applicable to:
,
,
MSN,,
4538,,
The Estimated Takeoff Time (ETT) may be entered by the pilot during the preflight phase at the
origin airport. This time is used as the initialization time for predictions.
The entry is accepted in the preflight phase, if the ETT is greater than the clock time.
PROCEDURE
PRESS the F-PLN key.
SELECT VERT REV at any waypoint.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - REQUIRED TIME OF ARRIVAL (RTA)
A318/A319/A320/A321 FLEET DSC-22_20-60-120 P 6/6
FCOM 19 AUG 10
SELECT the RTA prompt [2R].
ENTER the ETT in the [6R] field.
Note: ‐ If the current time exceeds the ETT entry, the CLK IS TAKE OFF TIME message is
displayed ; the ETT is replaced by the clock time.
‐ At takeoff, the takeoff time is automatically updated using the actual clock time.
‐ An ETT entry is automatically deleted, if the origin airport is modified, or if the clock is
inoperative.
‐ If a time constraint is entered at a waypoint in the F-PLN, the takeoff time required to
match the constraint is automatically computed by the FM. This result is displayed in
magenta as ETT at the origin.
USE OF TIME/ETT CONSTRAINT
During preflight : If an ETT has been entered, ‐ time predictions are based on the
entered value (or clock time, if greater).
‐ If both an ETT and a time constraint have been entered, time
predictions are based on the entered ETT value (or clock time, if
greater). The managed speed profile is computed to match the time
constraint, as closely as possible, using a pseudo cost index value.
(Not displayed).
‐ If only a time constraint has been entered :
• Optimum speeds are computed to determine the ETT, so as to
satisfy the time constraint.
• If necessary, flight time (based on optimum speeds) plus clock time
(current) is greater than the time constraint ; optimum speeds are
modified to match the time constraint as closely as possible.
After Takeoff : The predictions are based on the current time.
Speeds are adjusted to satisfy the time constraint.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - EQUITIME POINT
A318/A319/A320/A321 FLEET DSC-22_20-60-130 P 1/4
FCOM 19 AUG 10
EQUITIME POINT
　
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