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The bottom section of SD display is common and is displayed on all SD pages.
Total Air Temperature
Static Air Temperature
UTC Clock display
Gross weight
Aircraft gross weight is a sum of zero fuel weight and total fuel quantity. Until ZFW is entered through MCDU, the gross weight is
not available and amber XX is shown in this readout.
A319/320/321
Systems Manual
Phoenix Simulation Software P 30
REV 01 SEQ 001 AUTOFLIGHT
Overview
The Autoight system is a part of Flight Management System (FMS). It controls the Autopilots, Flight Directors, and Autothrust
system laterally and vertically throughout the ight. Fully automatic ight on the programmed route is possible from takeoff to
landing.
The aircraft can be own automatically by using Autopilots and Autothrust. The pilot can manually y the aircraft following the Flight
Director commands, which tell what the autopilot would do if it was controlling. The Autothrust system is independent of autopilot
and can be used when manually ying.
The operation modes of Autoight system are selected using the Flight Control Unit (FCU), located on glareshield. All ight
plan information, performance data and other initialization is done via Multi-purpose Control and Display units (MCDU) on center
pedestal (separate pop-up window in PSS A-3xx panel). Autothrust modes are automatically controlled by moving the thrust levers
through different gates.
The ight plan entry and operation of MCDU is discussed in separate chapter, MCDU.
The operation modes and status of FMS is displayed in Flight Mode Annunciations area of the Primary Flight Display.
Flight Control Unit (FCU)
The FCU is centrally located on the glareshield. It provides control of autopilots and ight directors, control of airspeed, horizontal
modes, climb/descent modes, and vertical speed or ight path angle.
The four knobs on FCU provide control of airspeed, lateral, and vertical modes. Each knob can be rotated, pushed and pulled.
Knobs are springloaded to neutral position.
If a knob is pulled, the pilot takes direct control of this function. This is called a Selected Guidance. If a knob is pushed, the
control is given to FMS which guides the aircraft according to entered route and optimum values according to current ight phase.
This is Managed Guidance.
Turning a knob selects a value in corresponding FCU window, which becomes a target for active modes if in Selected guidance.
If a function is in Managed Guidance, a white dot appears in corresponding window, and the window is dashed.
Altitude window is never dashed, and vertical speed knob doesn’t have a managed guidance function.
Flight Directors
Flight directors are controlled with FD button on EFIS control panel. Two different ight director types are
displayed depending on HDG-VS / TRK-FPA mode selection (see PFD chapter).
When FD is switched on with autopilot off, default guidance modes are engaged. In ight, the default
modes are HDG and V/S (or TRK and FPA, depending on selection). On the ground, CLB and NAV
are armed.
A319/320/321
Systems Manual
Phoenix Simulation Software P 31
REV 01 SEQ 001 AUTOFLIGHT
Autopilots
The Airbus has two identical autopilots. The autopilots are engaged or disengaged by pressing AP1 or
AP2 button on FCU. Normally, only one autopilot autopilot can be engaged. Selecting second autopilot
automatically disengages rst one. On approach stage, however, with LOC/GS modes armed or active, both
autopilots can be simultaneously engaged for ILS approach and autolanding.
Autopilot can be engaged immediately after takeoff.
If ight director was previously engaged, an autopilot will engage in current active modes. If FD was off,
engaging autopilot will engage default guidance modes, which are HDG/VS in ight.
Autothrust
The Autothrust (A/THR) system automatically controls engine thrust according to vertical guidance modes and speed target. Several
modes of autothrust operation include:
• Fixed thrust, engines maintain constant computed thrust.
• Variable thrust, the system adjusts thrust to maintain target airspeed.
The A/THR system can be in one of following states:
OFF: The thrust isn’t controlled.
Armed: Thrust is xed and corresponds to thrust levers position. A/THR changes to active when thrust levers are moved
to A/THR active range (see below).
Active: A/THR is automatically controlling thrust. Thrust modes automatically change according to active vertical modes.
Thrust levers
The A320 aircraft thrust levers are different from those found on Boeing-type or other
　
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