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In managed lateral modes, the HDG/TRK window is dashed and a white managed guidance dot is visible.
NAV mode disengages and switches to selected HDG mode when aircraft enters a ight plan discontinuity.
Armed NAV mode automatically engages several seconds after takeoff.
LOC mode
LOC mode is used during approaches to track localizer front course signals. It is armed by pressing the LOC button on FCU.
Pressing APPR button arms both LOC and G/S modes for an ILS approach. LOC mode can only be armed if the ILS frequency is
tuned. LOC mode cannot be used to track VOR radials.
Armed modes appear in blue color below active mode indication on Flight Mode Annunciator.
To disarm armed LOC mode, press the lighted LOC button.
Armed LOC mode engages (becomes active) at localizer capture.
LOC* mode
LOC* mode is a submode which occurs during localizer capture. It is an indication that localizer intercept is in progress but
not yet completed.
RWY mode
RWY mode is automatically engaged at takeoff, if NAV is not armed. It keeps ground track equal to the departure runway course.
A319/320/321
Systems Manual
Phoenix Simulation Software P 36
REV 01 SEQ 001 AUTOFLIGHT
Vertical guidance
Open Climb (OP CLB)
Open Climb is a selected guidance mode. It is used when climbing directly to selected altitude. No ight plan
constraints are honored.
Open Climb mode uses THR CLB autothrust mode to maintain climb thrust, and maintains target airspeed
by controlling aircraft pitch.
Open Climb mode is engaged by Pulling the ALT selector knob, if altitude selected in ALT window is above
current aircraft altitude. When approaching selected altitude, the aircraft will start to level off, and modes will
switch to ALT and SPEED (or MACH).
Open Climb is automatically engaged at the acceleration altitude if managed CLB mode doesn’t engage
(aircraft is not following a ight plan).
Open Descent (OP DES)
Open Descent mode is used to descend directly to selected altitude. It controls aircraft pitch to maintain target speed, and
commands idle thrust.
Open Descent mode is engaged by Pulling the ALT selector knob, if altitude selected in ALT window is below current aircraft
altitude.
When approaching selected altitude, the aircraft will level off and switch to ALT mode.
Expedite modes
Expedite Climb (EXP CLB) and Expedite Descent (EXP DES) modes use pitch to control aircraft speed similiar to OP CLB and
OP DES. Although, these modes engage managed speed guidance. EXP CLB mode commands Green Dot speed or maneuvering
speed if not in clean conguration, while EXP DES commands 340 kts or 0.8 Mach.
Expedite modes are engaged by pushing the EXPED button on FCU. If altitude selected in FCU ALT window is above current
altitude, EXP CLB will engage. If selected altitude is below, EXP DES engages.
Vertical Speed (V/S)
V/S mode controls vertical speed selected in V/S window. The autothrust maintains target speed using
SPEED or MACH mode.
V/S window is dashed unless V/S or FPA mode is engaged.
The V/S mode can be engaged in two ways. Pulling the V/S knob will engage V/S mode and will open V/S
window to the existing vertical speed. Pushing this knob will engage V/S mode and open the window with
zero vertical speed, which will result in aircraft levelling off.
The selected vertical speed can be changed by turning the selector knob.
Flight Path Angle (FPA)
FPA mode will be used instead of V/S mode if TRK-FPA is set with HDG-VS / TRK-FPA selector button.
Its use and operation is the same, except that this mode will maintain selected Flight Path Angle, shown
in degrees in V/S window.
A319/320/321
Systems Manual
Phoenix Simulation Software P 37
REV 01 SEQ 001 AUTOFLIGHT
Vertical guidance (continued)
Managed vertical guidance
The managed vertical modes, CLB, DES and ALT CST, provide automatic vertical control of aircraft, following vertical prole
associated with ight plan entered into the FMS. Autothrust modes are automatically selected to comply to speed prole of ight
plan. All speed and altitude constraints and speed limits entered in ight plan are obeyed. Speed guidance can be set to selected
speeds; in this case the speed prole will be ignored.
Managed vertical guidance is engaged by Pushing the altitude selector knob. Engagement is indicated by white managed guidance
dot next to FCU altitude window.
FCU altitude window is not dashed when in managed guidance. The altitude selected in ALT window always have priority over
vertical ight plan prole. For example, if managed guidance is performing a climb to FL340, and altitude window is set at 18000,
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PSS A319/A320/A321 Systems Manual 系统手册(13)
