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is replaced by a yaw bar index. This bar is said to
be centered when just below the central yellow square.
FPD/FPV SYMBOLS
The Flight Path Director (FPD) and the Flight Path
Vector (FPV) symbols can be displayed provided TRK-FPA
(Track-Flight Path Angle) is selected on the FCU.
NOTE: At certain system configuration changes, the
FMGCs send a command to the DMCs to make the FPD
and FPV symbols flash for 10 seconds.
AP/FD modes are correctly followed when the FPD and
FPV symbols are superimposed.
The FPD symbol provides command signals to intercept
and fly the lateral and vertical flight path as defined
by the FMGCs. The FPD symbol is removed if no guidance
mode is provided by the FMGCs.
The FPV symbol represents lateral and vertical flight
path information in terms of current track and Flight
Path Angle actually being flown. The FPD symbol
position is computed by the Air Data Inertial Reference
System (ADIRS).
NOTE: The yaw bar is identical to the FD bar case and
appears with the same conditions.
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ALL
FLIGHT DIRECTOR - FD BARS / FPD/FPV SYMBOLS
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SELF EXAMINATION
The FD bars are displayed:
A - on ground, when the system is
electrically supplied and just after the
safety tests.
B - when the FD functions are engaged, as
long as HDG V/S is displayed on the FCU
and an AP/FD mode is active.
C - as long as 1FD2 is displayed on the top
right of each PFD.
How do the pilots change the FD bars into FPD/FPV
symbols?
A - By pressing the central
HDG-V/S / TRK-FPA pushbutton on the FCU.
B - By disengaging the HDG or V/S modes.
C - By pressing a FD pushbutton.
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ALL
22 - AUTO FLIGHT SYSTEM
22-30-00 AUTOTHRUST
CONTENTS:
A/THR Loop Principle
A/THR Engagement
Thrust Levers
A/THR Function Logic
Modes
Alphafloor Protection
A/THR Operation in Flight
Disconnection
Self Examination
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ALL
AUTOTHRUST
A/THR LOOP PRINCIPLE
To perform the autothrust (A/THR) function, the thrust
target computed by the Flight Management and Guidance
Computers (FMGCs) is chosen by the Flight Control Unit
(FCU).
Then each FCU processor sends, along its own bus, the
THR target to the Electronic Control Units (ECUs) via
the Engine Interface Units (EIUs).
A/THR ENGAGEMENT
The engagement of the A/THR function can be MANUAL or
AUTOMATIC.
The A/THR is engaged MANUALLY by pressing the A/THR
pushbutton on the FCU.
This is inhibited below 100 feet RA, with engines
running.
The A/THR is engaged AUTOMATICALLY:
- when the autopilot/Flight Director (AP/FD) is
engaged in TAKE-OFF or GO-AROUND modes,
- or in flight, when the alphafloor is detected;
this is inhibited below 100 feet RA except
during the 15 seconds following the lift-off.
NOTE: To effectively have A/THR on the engines, the
engagement of the A/THR is confirmed by a logic
of activation in the ECUs.
THRUST LEVERS
The thrust levers are manually operated and
electrically connected to the ECUs.
Note that the thrust levers never move automatically.
Each lever has 3 sectors defined by detents and stops.
The thrust levers can be moved on a sector which
includes specific positions:
- Rear sector:
for idle reverse up to max reverse.
- Center section:
. "0": corresponds to an idle thrust,
. "CL": corresponds to a climb thrust.
- Forward section:
. "FLX/MCT": corresponds to a FLeXible Take-Off
thrust or a Maximum Continuous Thrust after an
engine failure,
. "TO/GA": corresponds to a maximum Take-Off/
Go-Around thrust.
The ECUs compute the thrust limit which depends on the
　
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