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POWER PLANT
THRUST CONTROL SYSTEM (CFM, GE) - THRUST RATING LIMIT
A330/A340 FLEET DSC-70-30-40 P 1/2
FCOM 19 AUG 10
GENERAL
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 selects the rating limit corresponding to the
higher detent.
AUTOMATIC MODE
Applicable to:
In the autothrust mode (A/THR function active), the FMGC computes the thrust, which is limited to
the value corresponding to the thrust lever position (unless the alpha-floor mode is activated).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (CFM, GE) - THRUST RATING LIMIT
A330/A340 FLEET DSC-70-30-40 P 2/2
FCOM 19 AUG 10
INDICATIONS ON FMA
The FADECs monitor the positions of the thrust levers, and trigger appropriate indications on the
FMA :
LVR ASYM : Appears in amber (third line on the FMA) if, with the A/THR active and all
engines running, one, two or three thrust levers are set out of the CLB notch.
LVR CLB : Flashes white (3rd line on the FMA), if the thrust levers are not in the CL
position, while the aircraft is above the altitude of thrust reduction with all
engines running.
LVR MCT : Flashes white (3rd line on the FMA), if the thrust levers are not in the MCT
position after an engine failure (with speed above green dot).
THR LK : Flashes amber (third line on the FMA) after A/THR disconnection (pilot
action or failure) resulting in the thrust being frozen.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (CFM, GE) - THRUST CONTROL
A330/A340 FLEET DSC-70-30-50 P 1/2
FCOM 19 AUG 10
THRUST CONTROL
Applicable to:
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (CFM, GE) - THRUST CONTROL
Intentionally left blank
A330/A340 FLEET DSC-70-30-50 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (RR, PW) - GENERAL
A330/A340 FLEET DSC-70-35-10 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ,
A FADEC dedicated to each engine controls thrust.
The pilot uses the thrust levers to set the thrust in manual mode, and the FMGS sets the thrust in
automatic mode.
The FADEC prevents the thrust from exceeding the limit for the thrust lever position in both manual
and automatic modes.
The engine thrust setting is made through control of the Engine Pressure Ratio (EPR).
EPR = low pressure turbine exhaust pressure (P5)/ Engine air inlet pressure (P2).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (RR, PW) - GENERAL
Intentionally left blank
A330/A340 FLEET DSC-70-35-10 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (RR, PW) - ENGINE POWER SETTING (RR)
A330/A340 FLEET DSC-70-35-20 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ,
Two modes of power setting, EPR and N1 modes are used for engine control depending on the
availability of air data inputs to the FADEC which are used for rating computation.
Two sources of air data are used by the FADEC :
- either engine data : P0 static pressure
P2 total air pressure
T2 total air temperature
- or ADIRS 1 or 2 data : Ps equivalent to engine P0
Pt equivalent to engine P2
Tt equivalent to engine T2
Thrust computation for both engines is mainly based on one ADIRS data. This ensures engine thrust
symmetry.
A comparison between ADIRS 1, ADIRS 2 and engine data is made by the FADEC to determine the
source to be validated and the mode to be used.
EPR MODE
Applicable to: ,
EPR mode is the normal mode to control the thrust.
The required EPR is set by controlling the fuel flow.
The FADEC computes the command EPR as a function of :
‐ Thrust Lever Angle (TLA)
‐ Altitude
‐ Mach number
‐ Air data (static pressure, total air pressure/temperature)
‐ Service bleed.
Note: During reverse operation, the thrust is controlled as a function of N1.
N1 MODE
Applicable to: ,
If no EPR is available (either sensed or computed), the affected FADEC will automatically revert to
N1 mode.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (RR, PW) - ENGINE POWER SETTING (RR)
　
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