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origin.
The FM computes a new managed speed profile from the aircraft position to the constrained
waypoint,􀀃in􀀃order􀀃to􀀃match􀀃the􀀃2􀀃min􀀃difference􀀃(▹T)􀀃between􀀃the􀀃time􀀃predicted􀀃at􀀃the􀀃constrained􀀃
waypoint and the TIME CSTR. Downpath of the constrained waypoint, the ECON SPD/MACH is
resumed, unless close to the top of descent. This modified managed speed profile can be checked
using the speed prediction, displayed for each waypoint of the F-PLN page.
The TIME CSTR is inserted on the VERT REV page. A TIME CSTR may be inserted at any waypoint
of the primary or secondary flight plan.
If the aircraft has initiated the descent, or if an engine-out condition is detected, the time constraint is
automatically deleted (TIME CSTR DELETED message on scratchpad).
If the aircraft enters a holding pattern, the downpath time constraint is deleted.
When inserted in the F-PLN, the TIME CSTR is displayed in magenta on the F-PLN page, as long as
no predictions are available.
When the predictions are available, the time constraint is replaced by the new predicted time at the
related waypoint, highlighted by a star (*) :
If the (*) is magenta, the ‐ time constraint is matched within 2 min
‐ If the (*) is amber, the time constraint is missed.
Time constraint matching criteria :
Note: ▵T is the time difference between the time predicted at the constrained waypoint and the
TIME CSTR.
GENERAL
Applicable to: ,
A time constraint may be assigned at any waypoint of the F-PLN, downpath of the FROM waypoint
origin. It can be an ”AT”, “AT OR BEFORE”, or “AT OR AFTER” constraint.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - TIME CONSTRAINT
A330/A340 FLEET DSC-22_20-60-90 P 2/6
FCOM 19 AUG 10
The FM computes a new managed speed profile from the aircraft position to the constrained
waypoint,􀀃in􀀃order􀀃to􀀃match􀀃the􀀃30􀀃s􀀃difference􀀃(▹T)􀀃between􀀃the􀀃time􀀃predicted􀀃at􀀃the􀀃constrained􀀃
waypoint and the Required Time of Arrival (RTA). This modified managed speed profile can be
checked using the speed prediction, displayed for each waypoint of the F-PLN page.
The RTA function uses a speed range between Green Dot and VMO-10 (or MMO- 0.02). When
the constrained waypoint is sequenced, the ECON SPD/MACH is resumed unless the constrained
waypoint is located in a descent segment.
Note: 1. The FM does not compute a new managed speed profile when a RTA is entered in the
descent profile, while the aircraft is in cruise, within 40 nm from the top of descent.
2. The managed speed target is not modified in the climb phase to avoid changes of flight
path during the climb. The managed speed profile is modified once the aircraft is in
cruise phase.
The time constraint is inserted on the RTA page. A time constraint may be inserted at any waypoint
of the primary or secondary flight plan.
If an engine-out condition is detected, the time constraint is automatically deleted and an RTA
DELETED message is displayed on scratchpad.
When inserted in the F-PLN, the RTA is displayed in magenta on the F-PLN page, as long as no
predictions are available.
When the predictions are available, the time constraint is replaced by the new predicted time at the
related waypoint, highlighted by a star (*) :
If the (*) is magenta, the time constraint ‐ is matched with the 30 s criteria
‐ If the (*) is amber, the time constraint is missed.
Time constraint matching criteria :
Note: ▵T is the time difference between the time predicted at the constrained waypoint and the
RTA.
TIME CSTR ENTRY
Applicable to:
PRESS the F-PLN key
SELECT vertical revision at revised waypoint
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
OTHER FUNCTIONS - TIME CONSTRAINT
A330/A340 FLEET DSC-22_20-60-90 P 3/6
FCOM 19 AUG 10
WRITE the time constraint into the scratchpad and ENTER by pressing the 2R key.
The display automatically reverts to the F-PLN A page.
Note: ‐ The TIME CSTR can be cleared directly on the F-PLN A page using the CLR key.
‐ If a time constraint is inserted in the F-PLN, the OPT STEP function is no longer
available. Therefore, if an OPT is to be inserted in the F-PLN, this shall be done before
entering the time constraint.
‐ The time constraint is automatically deleted in the following cases :
　
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