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VERTICAL F-PLN management 11
UTC CSTR [2R]
UTC CSTR field [2R] enables a time
constraint to be entered at a specific
WPT, provided the WPT is a fixed-position
(not a pseudo-waypoint) in ACTIVE or
SEC F-PLNs.
The field is displayed at all WPTs if an ETT
has been entered (See Part II: Ch 2.2
Preflight).
Only one UTC CSTR may exist in a F-PLN;
a second such entry will cause deletion of
the first.
The UTC CSTR applies to time AT the WPT; "AT OR BEFORE" and "AT
OR AFTER" functions are not provided.
UTC CSTR entries are not accepted in the following cases:
VERT REV AT DEVRO
EFOB=5.2 EXTRA=1.0
CLB SPD LIM UTC CSTR
250/FL100 [ ]
SPD CSTR ALT CSTR
[ ] [ ]
ACCESS
<WIND DATA STEP ALTS>
<RETURN
− ENG OUT mode active,
− No valid clock data,
− Decelerating to, or in a holding pattern,
− In DES or APPR phase, and at or below SPD LIM altitude,
− In GO-AROUND phase,
− If UTC CSTR more than 20hrs after clock time.
If a UTC CSTR already exists when any of the above occurs, it is
automatically deleted, and "TIME CSTR DELETED" s-pad msg (white) is
triggered.
These restrictions do not apply to entry of UTC CSTR in SEC F-PLN
created by SEC INIT function.
A UTC CSTR is predicted as missed at a WPT if difference between
predicted time at the WPT and constraint time exceeds the “Time
Tolerance” which depends on distance of time-constrained WPT from
A/C position.
For distances up to 2000 NM, Time Tolerance is 30 sec; for longer
distances it increases by 1 min/1000 NM.
UTC CSTR remains “missed” until Time Tolerance decreases to 15 sec
for distances up to 2000 NM, adjusted at same rate as above for longer
distances.
AIRBUS A318/319/320/321
© THALES AVIONICS S.A.
J43126AA 00
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