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A support, used to secure the fuel nozzle onto the
combustion case.
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A metering set, to calibrate primary and secondary
fuel flow sprays.
EFG
CTC-201-115-02
EFFECTIVITY
73-11-40 Page 7
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
FUEL NOZZLE
Some makes of fuel nozzle have a removeable inlet strainer, which is secured onto the inlet cover with a retaining ring.
Fuel passes through the strainer, enters the main body and reaches a spring-loaded check valve.
When the fuel pressure reaches 15 psig, the spring is compressed and the valve moves down.
Fuel is ported from the inner tube of the support to the primary body of the metering set.
Fuel then passes around the primary plug, and flows in between the plug and the convergent end of the primary body.
Fuel is then delivered, through a calibrated orifice, into the combustion chamber, at a set angle of 64° for regular nozzles, and 89° for wider spray nozzles.
When the fuel pressure is higher than 120 psig, the main spring is compressed, and the cartridge valve assembly moves down.
Fuel still passes through the primary path, and through the restricted orifice, where it enters the secondary flow chamber.
It then goes into the outer tube of the support to the secondary body of the metering set.
It passes around, and in between, the primary body and the secondary body.
Fuel is then delivered, through a Venturi type orifice, into the combustion chamber at an angle of 125°.
EFG
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CTC-201-120-02
EFFECTIVITY ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
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73-11-40 Page 9
ENGINE SYSTEMS Jan 03
CFM56-5B TRAINING MANUAL
EFG
FUEL NOZZLEFUEL NOZZLE
From the nozzle inlet, fuel passes through the inlet filter and accumulates within the cartridge assembly.
At 15 psig, the fuel opens the check valve. It is sent to the central area of the metering set which calibrates the spray pattern of the primary fuel flow (narrow angle).
When the fuel pressure reaches 120 psig, it opens the flow divider metering valve and the fuel goes through the outer tube of the support to another port in the metering set.
This port calibrates the spray pattern of the secondary fuel flow (wider angle of 125 °).
EFG
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CTC-201-116-01
EFFECTIVITY
73-11-40 Page 11
ALL CFM56-5B ENGINES FOR A319-A320-A321
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