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activate the autothrust. Due to the thrust levers position, IDLE thrust will be maintained.
When ALPHA FLOOR is activated, regardless of the initial status of A/THR and the position of the
thrust levers, the A/THR activates.
When A/THR is active:
‐ The A/THR pb on the FCU lights up
‐ The FMA displays A/THR mode in green in the first column and "A/THR" in white in the fifth
column.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A318/A319/A320/A321 FLEET DSC-22_30-90 P 5/16
FCOM 19 AUG 10
EFFECTS OF THRUST LEVER MOVEMENT DURING A/THR ACTIVATION
While A/THR is active:
‐ When both thrust levers are set above the CL detent (both engines operative) or one thrust
lever is set above MCT (one engine operative), the A/THR reverts from active to armed.
“A/THR” turns to blue on the FMA and the thrust levers control thrust directly.
The FMA displays "MAN THR” in white in its first column.
The thrust levers provide the flight crew with an immediate increase of thrust when both thrust
levers are pushed above the CL detent (two engines) or the active thrust lever above the MCT
detent (one engine operative).
‐ When both thrust levers are set below the CL detent (both engines operative) or one thrust lever
is set below MCT (one engine operative), a repeating warning (amber caution, single chime,
“A/THR LIMITED” ECAM message) is activated every 5 s until the flight crew moves the lever
back into the detent. “THR LVR” appears in green in the first column of the FMA and “LVR
CLB” (both engines operative) or “LVR MCT” (one engine operative) flashes below in white.
This device reminds the flight crew that the normal operating position of the thrust levers, when
A/THR active, is the CL detent (two engines) or the MCT detent (one engine operative).
When one thrust lever is in the CL detent and the other one ‐ out of detent, the “LVR ASYM”
amber message comes up until both levers are set in the CL detent (only with both engines
operative).
A/THR DISCONNECTION
Applicable to: ALL
GENERAL
When the A/THR is disconnected, it is neither armed nor active.
The A/THR can be disconnected in two ways:
‐ Standard disconnection:
• The flight crew pushes the instinctive disconnect pb on the thrust levers, or
• The flight crew sets both thrust levers to IDLE detent.
‐ Non-standard disconnection:
• The flight crew pushes the A/THR pb on the FCU while A/THR is active/armed, or
• The system loses one of the arming conditions.
CAUTION If the flight crew pushes and holds one instinctive disconnect pb for more than
15 s, the A/THR system is disconnected for the remainder of the flight. All A/THR
functions including ALPHA FLOOR are lost, and they can be recovered only at the
next FMGC power-up (on ground).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A318/A319/A320/A321 FLEET DSC-22_30-90 P 6/16
FCOM 19 AUG 10
Applicable to:
BELOW 100 FT RADIO ALTITUDE
When the radio altitude is below 100 ft and the flight crew sets both thrust levers above CL detent
or one above the MCT detent, the autothrust will disconnect.
With FDs ON, the autothrust rearms when at least one of the thrust levers is set to TOGA.
With FDs OFF, the autothrust remains disconnected.
If the PF sets both thrust levers slightly above CL detent for additional thrust and comes back to
CL detent, the A/THR will disconnect and remain disconnected. As a result, the thrust will increase
up to CLIMB thrust. The PF has to manually set the appropriate thrust for landing (or go-around).
Applicable to:
BELOW 100 FT RADIO ALTITUDE
When the radio altitude is below 100 ft and the flight crew sets both thrust levers above CL detent
or one above the MCT detent, the autothrust will disconnect. It will rearm automatically when at
least one of the thrust levers is set to TOGA.
If the PF sets the thrust levers slightly above CL detent but below TOGA and comes back to CL
detent, the A/THR will disconnect and remain disconnected. As a result, the thrust will increase
up to CLIMB thrust. The flight crew has to manually set the appropriate thrust for landing (or
go-around).
THRUST LOCK FUNCTION
Applicable to: ALL
The Thrust Lock function is activated when the thrust levers are in the CL detent (or the MCT detent
with one engine out), and:
‐ The flight crew pushes the A/THR pb on the FCU, or
‐ The A/THR disconnects due to a failure.
The thrust is locked at its level prior to disconnection. Moving the thrust levers out of CL or MCT
　
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