Active range

Eng outEng outEng outEng outAll engAll eng

1

Activation deactivation

• The A/THR is activated :– By pressing the A/THR pushbutton on the FCU, provided thrust

levers are in the A/THR active range.– By setting thrust levers back into A/THR active range.

• The A/THR is disconnected :– By bringing all thrust levers to IDLE.– By pressing the instinctive pushbuttons :– By pressing the instinctive pushbuttons :

2

CLIMB

Active range

• Active range of A/THR : between IDLE & CLIMB (allengines operative).

IDLE

• The FMGS computes the thrust (limited to thevalue corresponding to the lever position) :

FMGS N1

p g p )Flight conditions :

Zp, OAT, MN

• The A/THR is activated :– By pressing the A/THR pushbutton on the FCU,

provided thrust levers are in the A/THR activerange.

– By setting thrust levers back into A/THR activerange.

The A/THR is disconnected :• The A/THR is disconnected :– By bringing all thrust levers to IDLE.– By pressing the instinctive pushbuttons :

3

A/THR logic

The EPR command (calculated by the FMGS) varies between idle and thethrust corresponding to the actual position of the levers.

The lever position do not necessarily represents the enginethrust delivered.

Th tThrustAutothrust active

Upper limit of the EPR target

EPR rating limit CL

1 .21 .4

1 .6

1 1 59

EPR command

TOGA FLEX MCT IDLE

REV IDLE

MAX REV

CL 1 1. 1 59 CL 1 .453Actual position of the thrust levers

4