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A330/A340 FLEET DSC-70-35-20 P 2/2
FCOM 19 AUG 10
Upon reversion to N1 mode, a thrust equivalent to that achieved in EPR mode is provided, until a
change in thrust lever position.
Autothrust control is no more available. ALPHA FLOOR protection is lost.
In case of dispatch in N1 mode, flex take-off is not available. ALPHA FLOOR protection is lost.
Depending on the failure case leading to EPR mode loss, the FADEC will revert to either rated or
unrated N1 mode.
RATED N1 MODE
An automatic reversion to rated N1 mode occurs, when :
‐ Engine P2 and/or P5 are not available, or
‐ Engine P2 is lower than ADIRS Pt.
The FADEC will compute an EPR COMMAND, depending on the TLA, then convert it to a N1
COMMAND as a function of Mach.
The rated N1 mode can also be manually-selected via the ENG N1 MODE pushbutton on the
overhead panel.
UNRATED N1 MODE
An automatic reversion to unrated N1 mode occurs, when :
‐ Engine P2 and ADIRS 1 + 2 Pt are not available, or
‐ Engine T2 and ADIRS 1 + 2 Tt are not available, or
‐ Engine P0 and ADIRS 1 + 2 Ps are not available.
N1 is defined as a function of the TLA and altitude, and is limited by the FADEC to either the
lesser of N1 max or N1 redline (if T2 is available), or N1 redline (if T2 is not available).
The N1 rating limit, N1 TLA, and N1 max indications on the ECAM E/WD are lost.
EPR RECOVERY LOGIC
Applicable to: ,
With the FADEC in either rated or unrated N1 mode, switching OFF the ENG N1 MODE pushbutton
on the overhead panel will permit to return to the EPR mode, if the failure has disappeared.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (RR, PW) - THRUST LEVERS
A330/A340 FLEET DSC-70-35-30 P 1/2
FCOM 19 AUG 10
THRUST LEVERS
Applicable to: ,
The thrust levers can only be moved manually.
The rang of movement is divided into 3 operating segments.
The sector has 4 positions defined by detents or stops.
Thrust lever position is transmitted to the FADEC which computes and displays the thrust rating limit
and the EPR TLA.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (RR, PW) - THRUST LEVERS
Intentionally left blank
A330/A340 FLEET DSC-70-35-30 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (RR, PW) - THRUST RATING LIMIT
A330/A340 FLEET DSC-70-35-40 P 1/2
FCOM 19 AUG 10
THRUST RATING LIMIT
Applicable to: ,
The FADEC computes the thrust rating limit for each thrust lever position, as shown below.
If the thrust lever is set in a detent, the FADEC selects the rating limit corresponding to this detent.
If the thrust lever is set between two detents, the FADEC will select the rating limit corresponding to
the higher detent.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (RR, PW) - THRUST RATING LIMIT
Intentionally left blank
A330/A340 FLEET DSC-70-35-40 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (RR, PW) - THRUST CONTROL
A330/A340 FLEET DSC-70-35-50 P 1/4
FCOM 19 AUG 10
MANUAL MODE
Applicable to: ,
The engines are in the manual mode, provided the A/THR function is:
‐ Not armed, or
‐ Armed and inactive (thrust lever not in the A/THR operating range and no alpha floor).
In these conditions, each engine is controlled by its thrust lever position.
The pilot controls thrust by moving the thrust lever from IDLE to TOGA positions. Each thrust lever
position within these limits corresponds to an EPR.
When the thrust lever is in a detent, the corresponding EPR is equal to the EPR rating limit,
computed by the FADEC for this engine.
When the thrust lever is set in FLX MCT detent :
‐ On the ground :
The engine runs at the flex takeoff thrust rating, if the MCDU has selected a flex takeoff
temperature that is higher than the current total air temperature (TAT).
Otherwise, the engine produces maximum continuous thrust (MCT).
Note: A FLEX TEMP change during takeoff has no effect on thrust.
‐ After takeoff :
The pilot can change from FLX to MCT by moving the thrust lever to TOGA or CL, then back to
MCT. After that, he cannot use the FLX rating.
The pilot can always get MAX TO thrust by pushing the thrust lever all the way forward.
Note: Setting the thrust lever out of the FLX MCT detent, without reaching TOGA or CL detent,
has no effect.
A330/A340 FLIGHT CREW
OPERATING MANUAL
　
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