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or Managed climb or descent. Managed climb or descent means that the FMGC
is controlling in either. Open mode simply means using either full climb thrust for
climb or idle thrust for descent. Autothrust controls to a limit in Open, either the
climb limit or the idle limit.
The other “FCU” method to control thrust is to set vertical speed (V/S) which
allows the thrust to maintain speed and climb rate is controlled through pitch. In
this case autothrust is maintaining speed and is in Speed mode. Of course,
during cruise and approach the altitude or glide slope is held through pitch with
the autothrust maintaining the required speed. Managed thrust is controlled by
the FMGC.
If you don’t get anything else out of this little discussion please understand that
the autothrust works in one of two modes, Open (controlling thrust) and Speed
(controlling speed). Further, Open mode can be either climb or idle thrust.
Most of the time if you are going to have a problem it is in the Open mode
(controlling to thrust). If you are having problems with thrust doing something
other than what you think it should you can possibly try:
Turn off flight directors (if hand flying), this will cause autothrust to go to
Speed mode
Select vertical speed (if in Open climb or descent), this will cause
autothrust to go to Speed mode
Select Speed Select (if in Managed speed), this will force the commanded
speed to what you desire.
Arm A/THR (autothrust):
Arm on ground (with at least one FD on):
Set thrust lever in FLX/MCT if FLX temp is set
Set thrust lever to TOGA
Arm in flight:
Press on the A/THR pb on FCU when thrust levers not in active range or
setting thrust levers out of active range. Blue A/THR in FMA.
US Airways Airbus A319, A320, A321 Notes
53
Activate A/THR:
Note: on ground you will set takeoff thrust to either FLX/MCT or TOGA which are
manual thrust settings. When coming back to the CL detent after takeoff you are
putting the thrust levers to the A/THR active range, thus activating autothrust.
A/THR pb pressed on when autothrust in active range
Set thrust levers to active range when A/THR pb armed
ALPHA FLOOR protection activated (not a great way to activate!)
Disconnect A/THR:
Press instinctive disconnect pb on thrust levers
Place both levers to idle detent
Press off the A/THR pb on FCU when system active (green light goes out)
Set one thrust lever beyond MCT or both beyond CL detent when RA is
below 100’
Note: Pulling back the thrust levers from the CL detent during autothrust
operation will allow the pilot to limit autothrust upper limit but autothrust is still
active until levers are at idle. Chime and ECAM warning will sound every 5
seconds to remind pilot to either disconnect autothrust or reset thrust levers to
CL detent. The proper way to disconnect autothrust and begin manual thrust
operation is to bring thrust levers back until the TLA “donuts” are matched to
thrust indicators and then press instinctive disconnect pb on thrust lever.
Airbus Gotcha: Warning: If autothrust is disconnected and then thrust levers
are pulled back from CL detent the thrust will immediately go the power selection
commanded by the thrust levers and indicated on the TLA donuts. Be sure
power is at the intended setting when A/THR is disconnected to avoid power
surge.
Airbus Gotcha: Warning: If autothrust is disconnected by pressing the A/THR
pb on the FCU the aircraft won’t know if the pb was pressed off or signal was lost
and will give an ECAM warning to move thrust lever. It will think you are in a
Thrust Lock situation. Bottom line here, just use the instinctive disconnects (or
idle when at flare) to disconnect the auto thrust.
Alpha Floor – Angle of attack between α Prot and α Max at which the autothrust
will command TOGA regardless of thrust lever position.
US Airways Airbus A319, A320, A321 Notes
54
Alpha Floor will give:
A FLOOR in green with flashing amber box on FMA and in amber on E/WD
TOGA LK in green with a flashing amber box around it on the FMA when the
A FLOOR condition is left. TOGA thrust is frozen.
To cancel ALPHA FLOOR or TOGA LK disconnect the autothrust.
ALPHA FLOOR is available in NORMAL law only.
ALPHA FLOOR is enabled at liftoff and active during flight, disabled at 100’ RA
on approach to let you land the aircraft.
ALPHA FLOOR is disabled if you press the instinctive disconnects for 15 secs.
Please note that Alpha Floor has to do with autothrust while Alpha (α) Prot and
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