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Normal takeoff thrust rating is 8,729 pounds per engine. During engine-out operation, the automatic performance reserve (APR) system increases thrust on the operable engine to 9,220 pounds.
FLAT-RATED THRUST
Outside air temperature and pressure altitude are determining factors in achieving takeoff and APR power. Increases in ambient temperature or pressure altitude adversely affect the engine’s ability to produce rated thrust. The CF34-3B is flat-rated to ISA + 15°C at sea level.
ENGINE CONSTRUCTION
Description
The CF34 power plant has two independently rotating major assemblies. The N1 section consists
of a fan rotor that is driven through a shaft by a four-stage low-pressure turbine. The N2 section is
comprised of a 14-stage axial flow compressor, a combustor, an accessory gearbox and a
two-stage high-pressure turbine. The compressor is driven by the high-pressure turbine.
Flow Distribution
Engine airflow passes through the single-stage fan, and is divided into two airflow paths:
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Bypass air – Air is accelerated by the single-stage N1 fan only, and is ducted around the engine nacelle. Bypass airflow produces approximately 80% of the thrust at takeoff.
Thrust reversers are used to divert the bypass air forward to assist in airplane braking on the ground.
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Core air – Air that is accelerated by the N1 fan enters the N2 core where it is compressed, mixed with fuel, and ignited. The resulting combustion gases are exhausted through the high-pressure two-stage N2 turbine, which drives the N2 assembly. The exhaust gases are then discharged through the low-pressure four-stage
N1 turbine to drive the N1 fan. Jet pipe thrust produces approximately 20% of the takeoff thrust.
POWER PLANT Description Vol. 2 19.10.2
Oct 05/06
Flow Distribution Figure 19.10.1
Major Power Plant Components
N1 Fan
The N1 fan is a single-stage fan that consists of 28 titanium blades. A Kevlar blanket is wrapped around the inlet housing to contain damage from a failed fan blade. The N1 fan rpm is displayed on the EICAS page.
Variable Geometry (VG) Compressor
The VG system regulates airflow across the compressor, by changing the position of the compressor inlet guide vanes and the first five stages of the stator vanes. Fuel metered by the fuel control unit (FCU) is used to hydraulically change the vane angle. The VG system optimizes the airflow’s angle of attack at the compressor blades, and provides compressor stall and surge protection.
Accessory Gearbox
The engine-mounted accessory gearbox is driven by the N2 compressor. The gearbox drives the:
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Engine lubrication pumps;
.
Alternator that powers the N1 control amplifier;
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Engine-driven hydraulic pump (hydraulic pump 1A or 2A);
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Engine-driven fuel pump; and
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