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FCOM 19 AUG 10
GENERAL
Applicable to: MSN
4566,,,
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 inlet pressure (P2)
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (IAE) - GENERAL
Intentionally left blank
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FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (IAE) - ENGINE POWER SETTING
A318/A319/A320/A321 FLEET DSC-70-35-20 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: MSN
4566,,,
The FADEC has two mode of power setting, EPR and N1 modes.
EPR MODE
Applicable to: MSN
4566,,,
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
‐ Ambient temperature
‐ Air inlet total temperature (T2)
‐ Service bleed.
N1 MODES
Applicable to: MSN
4566,,,
If no EPR is available (either sensed or computed) the affected FADEC will automatically revert to N1
mode.
At the reversion to N1 mode (rated or unrated) an equivalent thrust to that achieved in EPR mode is
provided until a thrust lever position change.
Autothrust control is lost. Alpha-floor protection is lost.
Depending on the failure case leading to EPR mode loss, the FADEC will revert to either rated or
unrated mode.
RATED N1 MODE
An automatic reversion to rated N1 mode occurs in the event of loss of sensed EPR. This occurs
when P2 (engine inlet total pressure) and/or P5 (LP turbine exit total pressure) engine parameters
are not available.
The FADEC will determine N1 power setting as a function of TLA, altitude and engine inlet total
temperature.
The rated N1 mode can also be manually selected through the ENG N1 MODE pushbutton on the
overhead panel.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (IAE) - ENGINE POWER SETTING
A318/A319/A320/A321 FLEET DSC-70-35-20 P 2/2
FCOM 19 AUG 10
UNRATED N1 MODE
An automatic reversion to unrated N1 mode occurs in the event of loss of computed EPR due to
the loss of T2 (engine inlet total air temperature) or ambient pressure (ambient pressure engine
sensor) engine parameters.
The N1 is defined as a function of TLA only and is limited by the FADEC to either the smaller of
maximum N1 or N1 redline (if T2 is available) or N1 redline (if T2 is not available).
The N1 rating limit, N1 TLA and maximum N1 indications on ECAM E/WD are lost.
Note: An overboost can occur during reversion in the unrated N1 mode, with thrust lever at full
forward position.
EPR RECOVERY LOGIC
Applicable to: MSN
4566,,,
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (IAE) - THRUST LEVERS
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FCOM 19 AUG 10
THRUST LEVERS
Applicable to: MSN
4566,,,
The thrust levers can only be moved manually.
They move over a sector that is divided into four operating segments.
The sector has five positions defined by detents or stops.
Thrust lever position is transmitted to the FADEC, which computes and displays the thrust rating limit
and the N1 for that Thrust Lever Angle (TLA).
Note: There is no reverse idle detent. When the pilot moves the lever out of the idle stop by
pulling up the reverse lever on the front of the thrust lever, he selects reverse idle.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (IAE) - THRUST LEVERS
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-70-35-30 P 2/2
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (IAE) - THRUST RATING LIMIT
A318/A319/A320/A321 FLEET DSC-70-35-40 P 1/2
　
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