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position of the thrust levers.
If both thrust levers are in the same detent, the
thrust limit corresponds to this detent.
If both levers are not in the same detent, the thrust
limit corresponds to the next higher detent.
The FMGCs select the higher of the ECU1 and ECU2 thrust
limits for thrust target computation.
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TMUFGCW05-P01 LEVEL 1
AUTOTHRUST
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AUTOTHRUST
A/THR FUNCTION LOGIC
The A/THR function can be ENGAGED or DISENGAGED.
When it is engaged, it can be ACTIVE or NOT ACTIVE.
A/THR DISENGAGED
When the A/THR function is DISENGAGED:
- the thrust levers control the engines,
- on the FCU, the A/THR pushbutton light is OFF,
- the Flight Mode Annunciator (FMA) displays
neither the A/THR engagement status nor the
A/THR modes.
A/THR ENGAGED and ACTIVE
When the A/THR function is ENGAGED, A/THR is ACTIVE
if:
- at least, one thrust lever is between the "CL"
detent (included) and the "0" stop (included),
and, at the most, one thrust lever is between
the "FLX/MCT" detent and the "CL" detent, and
there is no engine in FLEX TO mode,
- or the alphafloor protection is active
independently of the thrust lever positions.
Note that in case of one engine failure, the A/THR
activation zone becomes between the "FLX/MCT" detent,
instead of the "CL" detent, and the "0" stop.
Because the A/THR function is active:
- the A/THR system controls the engines,
- on the FCU, the A/THR pushbutton light is ON,
- the FMA displays the A/THR engagement status
(in white) and the A/THR mode.
A/THR ENGAGED and NOT ACTIVE
When the A/THR function is ENGAGED, A/THR is NOT ACTIVE
if:
at least one thrust lever is above the "FLX/MCT"
detent, or both thrust levers are above the "CL"
detent, or at least one engine is in FLEX TO mode,
with the alphafloor protection not active.
Because the A/THR function is not active:
- the thrust levers control the engines (as long
as a thrust lever is outside the A/THR active
area),
- the A/THR pushbutton light is ON,
- the FMA displays the A/THR engagement
status (in cyan) and the MANual THRust
rating.
TMUFGCW05-T01 LEVEL 1
EFFECTIVITY 22-30-00 Page 4
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 36
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AUTOTHRUST
MODES
The A/THR function computes a thrust target according
to modes and their related reference parameters.
The reference can be:
- a SPEED or a MACH NUMBER; in this case, the
source is either the FCU (value chosen by the
pilot), or the FMGC itself,
- a THRUST; in that case, the sources are either
the ECUs (which compute the thrust limit) when
the A/THR is not active, or the FMGC itself
(within the thrust limit always computed by
the ECUs) when the A/THR is active.
The A/THR modes are SPEED/MACH, THRUST, RETARD which
can be overpassed by the alphafloor protection.
The choice of the mode is automatically made by the
FMGCs according to the active AP or FD vertical mode.
This choice is based on a simple law: "Priority to the
speed control".
- When the AP (with elevators) controls the
aircraft speed, the A/THR has to control the
engines by a fixed thrust demand (THRUST mode).
- When the AP controls another aircraft parameter
(e.g. altitude), the A/THR has to take care of
the aircraft speed by a variable thrust demand
to the engines (SPEED/MACH mode).
- Beside these two modes, RETARD is only available
in automatic landing when engine thrust has to
be reduced to idle for the flare phase below 40
feet RA.
When no vertical mode is engaged, the A/THR operates
only in SPEED/MACH modes except:
- when THRUST mode engages automatically in case
of alphafloor,
- when, A/THR being in RETARD, if AP is disengaged,
the A/THR function remains in RETARD mode, the
aircraft being on ground.
ALPHAFLOOR PROTECTION
The A/THR function protects against an excessive
Angle-Of-Attack.
The alphafloor signal is detected by each Flight
　
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