MULTIPHASE
VERTICAL F-PLN management 13
If UTC CSTR is predicted as missed, "TIME ERROR AT XXXXX" (WPT
ident)” s-pad msg (white) is triggered, if NAV mode engaged or A/C on
ground.
On PFD:
If SPD is managed and NAV mode is
engaged, speed target moves to value
shown on PERF page to comply with UTC
CSTR, or minimize time error,
If SPD is managed and HDG/TRK mode is
engaged, FM speeds continue to be
adjusted to try to match CSTR, but target
on PFD is frozen until NAV mode engaged.
If managed speed is engaged when in NAV
mode, or vice versa, speed target is frozen
for 15 sec; "SETTING SPD/TIME CSTR" s-
pad msg (white) is triggered if Managed
SPEED is engaged while in NAV mode, or
NAV mode is engaged while in managed
speed mode.
On ND, UTC CSTR time is shown
(magenta) at associated WPT, if CSTR p/b
pushed (ETT and UTC at FRM WPT are not
shown).
On MCDU, PERF page shows CI [2L]: TIME
CSTR.
FMS computes a modified COST INDEX to
derive a target speed within the operating
limits to comply as closely as possible with
time constraint.
PERF page of active phase shows frozen
speed if in HDG/TRK, other PERF pages
show updated managed speeds.
CRZ
ACT MODE UTC DEST EFOB
MANAGED 1629
4.1
CI
TIME CSTR
TO
(T/D)
MANAGED
UTC DIST
.72
1608 279
DES CABIN RATE
-350
FT/MN
ACTIVATE
NEXT
{APPR PHASE
PHASE>
To enter Estimated Time of Take-off (ETT)
UTC CSTR function may be used to enter an ETT.
Predicted times at en-route WPTs and ETA at DEST will then be
computed and displayed on TMPY F-PLN.
(Refer to PART II: Preflight – Ch.2.2 Supplementary Procedures.)
An ETT cannot be cleared from the VERT REV page at origin, but can be
modified.
An ETT may be computed by FMGC as a result of a UTC CSTR entry
en-route or at DEST (see below).
AIRBUS A318/319/320/321
© THALES AVIONICS S.A.
J43126AA 00
Summary of Contents for FMGS
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