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If thrust levers are out of detent, thrust is manually controlled and, therefore, unlocked.
An ECAM caution and an FMA message trigger during thrust lock:
‐ THR LK appears in amber on the FMA
‐ The ECAM caution is:
AUTO FLT: A/THR OFF
THR LEVERS.....MOVE
ENG: THRUST LOCKED
THR LEVERS.....MOVE
In this case, when the flight crew moves the thrust levers out of detent, full manual control is
recovered, and the THRUST LOCKED message disappears from the FMA.
This feature should not be used, unless the instinctive disconnect pushbuttons are inoperative.
A330/A340 FLIGHT CREW TRAINING MANUAL
OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A330/A340 FLEET OP-030 P 8/14
FCTM 17 JUN 09
ALPHA FLOOR
When the aircraft's angle-of-attack goes beyond the ALPHA FLOOR threshold, this means that the
aircraft has decelerated significantly (below ALPHA PROT speed): A/THR activates automatically
and orders TOGA thrust, regardless of the thrust lever position.
The example below illustrates that:
• The aircraft is in descent with the thrust levers manually set to IDLE.
• The aircraft decelerates, during manual flight with the FD off, as indicated on the FMA.
Speed Scale and FMA Indications in a Typical A Floor Case
When the speed decreases, so that the angle-of-attack reaches the ALPHA FLOOR threshold,
A/THR activates and orders TOGA thrust, despite the fact that the thrust levers are at IDLE.
When the aircraft accelerates again, the angle-of-attack drops below the ALPHA FLOOR
threshold. TOGA thrust is maintained or locked. This enables the flight crew to reduce thrust, as
necessary. TOGA LK appears on the FMA to indicate that TOGA thrust is locked. The desired
thrust can only be recovered by setting A/THR to off, with the instinctive disconnect pushbutton.
ALPHA floor is available, when the flight controls are in NORMAL LAW, from lift off to 100 ft RA at
landing. It is inhibited in some cases of engine failure.
A/THR USE - SUMMARY
Use of A/THR is recommended during the entire flight. It may be used in most failures cases,
including:
• Engine failure, even during autoland
• Abnormal configurations
However, use of manual thrust is recommended when the autotrim function is lost. The aim of this
recommendation is to avoid large thrust changes.
A330/A340 FLIGHT CREW TRAINING MANUAL
OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A330/A340 FLEET OP-030 P 9/14
FCTM 17 JUN 09
A/THR use in flight
A/THR should be monitored via the:
• FMA – SPEED / SPEED TREND on the PFD
• N1/N1 command (EPR) on the ECAM E/WD.
AP, FD, A/THR MODE CHANGES AND REVERSIONS
Applicable to: ALL
INTRODUCTION
The flight crew manually engages the modes.
However, they may change automatically, depending on the:
• AP, FD, and A/THR system integration
• Logical sequence of modes
• So-called "mode reversions".
AP, FD, ATHR SYSTEM INTEGRATION
There is a direct relationship between aircraft pitch control, and engine thrust control.
A330/A340 FLIGHT CREW TRAINING MANUAL
OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A330/A340 FLEET OP-030 P 10/14
FCTM 17 JUN 09
This relationship is designed to manage the aircraft's energy.
• If the AP/FD pitch mode controls a vertical trajectory (e.g. ALT, V/S, FPA, G/S):
A/THR controls speed
• If the AP/FD pitch mode controls a speed (e.g. OP CLB, OP DES):
A/THR controls thrust (THR CLB, THR IDLE)
• If no AP/FD pitch mode is engaged (i.e. AP is off and FD is off):
A/THR controls speed
Therefore, any change in the AP/FD pitch mode is associated with a change in the A/THR mode.
Note: For this reason, the FMA displays the A/THR mode and the AP/FD vertical mode
columns next to each other.
THE LOGICAL SEQUENCE OF MODES
In climb, when the flight crew selects a climb mode, they usually define an altitude target, and
expect the aircraft to capture and track this altitude. Therefore, when the flight crew selects a climb
mode, the next logical mode is automatically armed.
For example:
AP/FD mode capture and tracking (1)
The flight crew may also manually arm a mode in advance, so that the AP/FD intercepts a defined
trajectory.
Typically, the flight crew may arm NAV, LOC-G/S, and APPNAV-FINAL. When the capture or
tracking conditions occur, the mode will change sequentially.
AP/FD mode capture and tracking (2)
These logical mode changes occur, when the modes are armed. They appear in blue on the FMA.
A330/A340 FLIGHT CREW TRAINING MANUAL
OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A330/A340 FLEET OP-030 P 11/14
FCTM 17 JUN 09
　
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