FMS GENERAL DESCRIPTION
16 FMGS OPERATION
Vertical guidance
Managed modes: CLIMB, DESCENT
CLB/DES modes are engaged by pushing the Altitude Selector knob
provided Lateral Guidance is MANAGED (NAV).
Vertical guidance is controlled by the FMGC to follow the FMS profile
and comply with altitude constraints inserted in flight plan.
−
On PFD, FMA displays CLB/DES,
−
On FCU, Altitude Window displays the target altitude and the
Managed Level Change white dot,
−
Altitude/FL Constraints Management:
−
When in CLB/DES modes, the FMGC will stabilize the aircraft at the
FCU altitude or FMS altitude constraint, whichever is first.
−
If altitude is limited by the FMS, FMA displays ALT CSTR, and the
blue Target Altitude/Selected Flight Level symbol becomes magenta.
Selected modes: OPEN CLIMB, OPEN DESCENT, V/S or FPA
OP CLB/OP DES & V/S modes are engaged by pulling the Altitude
Selector knob.
Vertical guidance is controlled by the pilot.
−
On PFD, FMA displays OP CLB/OP DES, (EXP CLB / EXP DES, as
installed),
−
On FCU, Altitude Window displays the target altitude, the Managed
Level Change white Dot is blank,
PFD: Vertical deviation symbol (Managed or Selected mode)
On PFD, this symbol appears on the altitude scale corresponding to the
theoretical vertical profile computed by the FMGC. It is displayed from
the top of descent down to the MAP altitude. The pilot can read the
VDEV directly from the altitude scale. The range is ± 500 feet.
When the VDEV value exceeds ± 500 feet, the symbol stays at the
range limit and the PROG page displays the exact value.
FMA indications in 2
nd
column from left:
−
ALT is displayed for an intermediate level-off during climb or
descent.
−
ALT CRZ indicates that altitude matches with the FMS cruise level.
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© THALES AVIONICS S.A.
AIRBUS A318/319/320/321
Summary of Contents for FMGS
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