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common aircraft. The thrust levers move through distinct detents, or gates, marked
“MREV”, “IDLE”, “CL”, “FLX/MCT”, and “TO-GA”. Takeoff power is applied by moving
the levers to TO-GA or FLX-MCT gate, which commands autothrust system to produce
computed takeoff thrust corresponding to current conditions. At thrust reduction altitude,
thrust levers are retarded to CL gate, which automatically engages autothrust system.
From this point, the levers are normally left in CL detent through all the ight until just
before touchdown.
Autothrust system controls engine thrust corresponding to active thrust modes and
thrust limits. The A320 thrust levers are not back-driven by autothrust system, and don’t
move as the thrust is automatically adjusted. Unless needed, they are left in CL gate
until synthesized voice announces “RETARD” 20 feet above landing runway.
Due to this, thrust control is implemented differently than on other Flight Simulator
panels. Instead of using joystick throttle or Flight Simulator keys, the panel uses custom
keys (Numpad PLUS and Numpad MINUS by default) to move thrust levers between gates. You can also use pedestal view and
move levers with the mouse. Thrust levers position can be checked by looking at thrust Flight Mode Annunciator on PFD, the thrust
limit name on E/WD, or by checking the pedestal view.
Manual thrust control is still possible, using joystick throttle or Flight Simulator keys. Make sure that the panel-simulated thrust
levers are left at IDLE, or set at CL but the autothrust is disengaged.
A/P and F/D indications on FMA
The last column of FMA display on PFD shows engagement status of autopilots
and ight directors. First line is autopilot status, which can be AP 1,
AP 2, AP 1+2 (both a/p engaged), and blank (none engaged).
Second line shows FD status, which is 1FD2 (FDs engaged) or blank (FDs
swithced off).
A319/320/321
Systems Manual
Phoenix Simulation Software P 32
REV 01 SEQ 001
A/THR status
Initially, with thrust levers in IDLE (0) detent, the A/THR is OFF.
During takeoff, when levers are moved into TO-GA or FLX, A/THR becomes Armed. The
engines are providing computed Takeoff, Go-around or Flex thrust.
At thrust reduction altitude, levers are moved back to CL gate. The area between IDLE
and CL gates is Active A/THR range. This means that, as the A/THR was Armed,
it will automatically switch to Active status. A/THR will automatically
control thrust according to any thrust demands. Thus, thrust levers
are normally left in CL gate for the duration of ight.
Retarding levers to IDLE (0) de-activates A/THR system.
When A/THR is Armed or Active, a light on FCU A/THR button is
illuminated. Pushing this button allows to disarm or deactivate A/THR
system. Pushing this button with A/THR off will Activate the system if
levers are at CL, or Arm the system if levers are ahead of CL.
AUTOFLIGHT
Autothrust modes
TOGA
Autothrust provides xed maximum takeoff / go around thrust. This mode is active when thrust levers are in TO-GA gate, and
A/THR.
FLX
Flex thrust, used at reduced thrust takeoffs. The xed reduced thrust is calculated based on an assumed temperature entered on
MCDU Perf Takeoff page. The reduced thrust is equal to the takeoff thrust that would be available at the assumed temperature.
This mode is active when thrust levers are moved to FLX/MCT gate.
CLB
Fixed thrust equal to the climb thrust rating available at current ambient conditions. This mode is available only with A/THR Active,
and is automatically used during climbs, with airspeed controlled by pitch.
IDLE
Autothrust commands xed idle thrust. This mode is available only with A/THR Active, and is automatically used during descents.
SPEED
Autothrust controls engine thrust to maintain selected or managed airspeed. This mode is available only with A/THR Active, and is
automatically used in level ights, ights with selected VS or FPA, or when the aircraft is following a specied vertical path.
MACH
This mode is identical to SPEED but is used when target is Mach number. The SPEED mode automatically transitions to MACH
at predetermined altitude, and vice versa.
A319/320/321
Systems Manual
Phoenix Simulation Software P 33
REV 01 SEQ 001 AUTOFLIGHT
Autothrust Flight Mode Annunciations
The Flight Mode Annunciator (FMA) on PFD shows current modes and status of A/THR system. A/THR modes are shown in rst
FMA column, and last column indicates current status of A/THR.
A/THR Mode A/THR Status
MAN
FLX 42
Thrust modes
　
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本文鏈接地址：PSS A319/A320/A321 Systems Manual 系統手冊(11)