TRAINING MANUAL CFM56-5B ENGINE SYSTEMS 培训手册 CFM56-5B 发动机系统(33)

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-Pressure : with an increase in altitude, thrust will decrease when operating at a constant RPM due to the reduction in air density, which reduces the mass flow and fuel flow requirements.
-Mach : when mach number increases, the velocity of air entering the engine changes, decreasing thrust. To determine the fan speed, the ECU calculates M0 from the static pressure, the total pressure and the TAT values.
-Bleed : ECS bleed and anti-ice bleed are taken into account in order to maintain the same EGT level with and without bleeds.

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CTC-201-291-00
EFFECTIVITY
PWR MAN Page 7
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03

CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
POWER MANAGEMENT AND FUEL CONTROL
Engine build-up tolerances create thrust differences between engines operating at the same N1.
The ECU uses the N1 discrete modifier to reduce the thrust differences between individual engines.
The N1 command is reduced within the ECU, and this reduces the N1 actual speed by a certain percentage. Since N1 speed equals thrust, different thrust outputs can be matched.
The N1 modifier level that reduces N1, does not affect the value sent to the flight deck for display, and so, the flight deck N1 indication remains unaffected.
N1 trim levels (or modifiers) are determined during the test cell run and the N1 trim is only active beyond MCT setting.
In certain flight conditions, the ECU washes out the computed trim when N1 reaches the red line.

EFG

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CTC-201-292-00
EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321

CFMI PROPRIETARY INFORMATION
PWR MAN Page 9
ENGINE SYSTEMS Jan 03
CFM56-5B TRAINING MANUAL

EFG
POWER MANAGEMENT
Flex Take-off.
The Flex Take-off function enables the pilot to select a take-off thrust, lower than the maximum take-off power available for the current ambient conditions.
Temperatures for the flexible take-off function are calculated according to the ‘assumed temperature’ method.
This means setting the ambient temperature to an assumed value, which is higher than the real ambient temperature. The assumed ambient temperature (99°C max) is set in the cockpit, using the MCDU.
The flexible mode is only set if the engine is running and the aircraft is on the ground.
However, the power level, which is set by the FADEC in the flexible mode, may be displayed on the ECAM by input of a flexible temperature value, through the MCDU, and setting the TRA to the flex position, before the engine is started.
Derated Take-off.
Derated take-off is provided to achieve take-off power levels below the maximum level.
　
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