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Protection against fan stall
Modified Engine Acceleration Schedule for Take Off ‐ (MEASTO) : A logic that ensures a
progressive thrust is automatically set during the takeoff roll. Engine acceleration is controlled with
an “EPR/second” rate in EPR mode.
‐ Stall recovery logic : When a fan stall is detected, a logic is triggered to clear this fan stall. The fuel
flow is forced to idle and remains idle until engine shut down.
Keep out zone logic :
‐ To prevent fan instability, this logic avoids stabilized engine operation between the 1.16 to 1.28
EPR range (in N1 rated mode, the keep-out zone depends on the ambient conditions), when on
ground with an aircraft speed below 80 kt .
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FADEC
A330/A340 FLEET DSC-70-20 P 7/10
FCOM 19 AUG 10
POWER SUPPLY
Applicable to:
The FADEC system is :
‐ Powered by the aircraft’s electrical circuit below 15 % N2.
‐ Self-powered above 12 % N2.
‐ both supplies are connected between 12 and 15 %.
FADEC ELECTRICAL SUPPLY LOGIC
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FADEC
A330/A340 FLEET DSC-70-20 P 8/10
FCOM 19 AUG 10
FADEC POWER SUPPLY
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FADEC
A330/A340 FLEET DSC-70-20 P 9/10
FCOM 19 AUG 10
POWER SUPPLY
Applicable to: ,
The FADEC system is :
‐ Powered by the aircraft’s electrical circuit below 8 % N3, via the Power Control Unit (PCU) which
converts 115 VAC into 22 VDC.
‐ Self-powered above 8 % N3.
FADEC ELECTRICAL SUPPLY LOGIC
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
FADEC
A330/A340 FLEET DSC-70-20 P 10/10
FCOM 19 AUG 10
FADEC POWER SUPPLY
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (CFM, GE) - GENERAL
A330/A340 FLEET DSC-70-30-10 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (CFM, GE) - GENERAL
Intentionally left blank
A330/A340 FLEET DSC-70-30-10 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (CFM, GE) - THRUST LEVERS
A330/A340 FLEET DSC-70-30-30 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to:
The thrust levers can only be moved manually.
The rang of movement is divided into 3 operating segments.
Thrust lever position is transmitted to the FADEC which computes and displays the thrust rating limit
and the N1 TLA
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
POWER PLANT
THRUST CONTROL SYSTEM (CFM, GE) - THRUST LEVERS
A330/A340 FLEET DSC-70-30-30 P 2/2
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 not active (thrust lever not in the A/THR operating range and no alpha floor).
In these conditions, each engine is controlled by the position of its thrust lever.
The pilot controls the thrust by moving the thrust lever from IDLE to TOGA positions. Each position of
the thrust lever within these limits corresponds to an N1.
When the thrust lever is in a detent, the corresponding N1 is equal to the N1 rating limit computed by
the FADEC for this engine.
When the thrust lever is in the 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 change of FLEX TEMP during the takeoff has no effect on the thrust.
‐ After take-off :
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 FLX MCT detent without reaching TOGA or CL detent has no
effect.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
　
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