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Augmentation Computer (FAC).
In case of excessive Angle-Of-Attack or avoidance
maneuver, the FACs send an order to the FMGCs which
activate the alphafloor protection.
The A/THR automatically engages or stays engaged active
and the engine thrust becomes equal to the
Take-Off/Go-Around thrust for any thrust lever position.
In this condition, the green message "A.FLOOR" with
an amber flashing box is displayed on the FMA.
When the alphafloor detection is no longer present in
the FACs, the green message "TOGA LK" with an amber
flashing box (LK for LocK) is displayed on the FMA.
The alphafloor protection can only be cancelled through
the disengagement of the A/THR function.
TMUFGCW05-T01 LEVEL 1
EFFECTIVITY 22-30-00 Page 5
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 37
ALL
AUTOTHRUST
A/THR OPERATION IN FLIGHT
The aircraft is on ground and ready for Take-Off.
Neither the AP nor the A/THR are engaged.
The engines are controlled by the thrust levers.
To Take-Off, the pilot sets the thrust levers to the
TO/GA stop or to the FLEX/MCT detent if a flexible
temperature is selected on a Multipurpose Control and
Display Unit (MCDU).
This engages the A/THR function (but it is not active).
At the thrust reduction altitude, a message on the
FMAs indicates to the pilot that he has to set the
thrust levers into the "CL" detent.
As soon as the thrust levers are in the "CL" detent,
the A/THR is active.
If a thrust lever is set into the "CL-MCT" or "O-CL"
area, a message on the FMAs warns the pilot to set the
thrust lever to the "CL" detent (white LVR CLB message
if "CL-MCT" area, amber LVR ASYM message if "O-CL"
area).
The A/THR remains active.
Then, the thrust levers remain in this position until
the approach phase.
During automatic landing, before touch down, an auto
call out, "RETARD", indicates to the pilot that he has
to set the thrust levers to the "0" stop.
When he does it, the A/THR disengages.
This allows the automatic activation of ground spoilers
if they are in armed condition.
Then, on ground, the pilot moves the thrust levers on
the REVerse sector.
DISCONNECTION
Besides the normal A/THR operation, the A/THR function
is disengaged either by a pilot action or in case of
a system failure.
The A/THR function can be disengaged either by pressing
at least one of the two red instinctive disconnect
pushbuttons on the side of the thrust levers or by
pressing the A/THR pushbutton on the FCU.
A/THR disengagement can also be due to an external
system failure.
When the A/THR function is active, the actual engine
thrust does not necessarily correspond to the thrust
lever position.
Consequently, it is important to know what happens
after an A/THR disconnection:
When the disconnection is made by the instinctive
disconnect pushbutton, the thrust is immediatly
adjusted to the thrust lever position.
In other cases, after FCU pushbutton disconnection,
or failure:
- When a thrust lever is in its detent, the thrust
on the corresponding engine is frozen at its
last value just before the disconnection (Memo
mode).
- As soon as a thrust lever is moved out the
detent, or if it is not in a detent, the
thrust on the corresponding engine is
smoothly adapted to the thrust lever
position.
TMUFGCW05-T01 LEVEL 1
EFFECTIVITY 22-30-00 Page 6
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 38
ALL
THIS PAGE INTENTIONALLY LEFT BLANK
TMUFGCW05 LEVEL 1
EFFECTIVITY 22-30-00 Page 7
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 22 AUTO FLIGHT SYSTEM
UF94200
EFFECTIVITY Page 39
ALL
SELF EXAMINATION
What happens when the A/THR function is engaged and
not active?
A - The A/THR system controls the engines
and the A/THR pushbutton light is ON.
B - The thrust levers control the engines
and the A/THR pushbutton light is OFF.
C - The thrust levers control the engines
and the A/THR pushbutton light is ON.
When you read the green message "TOGA LK" with an
amber flashing box on the FMA of the PFD, what does
it mean?
A - The A/THR is active with the alphafloor
protection active and the alphafloor is
　
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