1) Automatic start.
During an automatic start, the ECU includes engine protection and provides limits for N1, N2 and EGT, with the necessary indications in the cockpit.
The automatic starting procedure is :
- Rotate mode selector to IGN/START.
Both ECU’s are powered up.
-Switch the MASTER LEVER to ‘ON’. The SAV opens and :
-At 16% N2 speed, one igniter is energized.
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At 22% N2 speed, fuel is delivered to the combustor.
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At 50% N2 speed, the SAV is closed and the igniter de-energized.
In case of no ignition, the engines are dry motored and a second starting procedure initiated on both igniters.
2) Manual start.
During a manual start, the ECU provides limited engine protection and limitation on EGT only.
The manual starting procedure is :
- Rotate mode selector to IGN/START.
Both ECU’s are powered up.
- Press the MAN/START push button. The SAV opens and :
-when N2 speed > 20%, switch the MASTER LEVER to ‘ON’.
-the two igniters are energized and fuel is delivered to the combustor.
- at 50% N2 speed, the SAV is closed and the igniters automatically de-energized.
When the engines are started (manual, or automatic), the mode selector must be switched back to the NORMAL position.
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CTC-201-159-02
EFFECTIVITY
80-00-00 Page 7
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
EFG
STARTING SYSTEM
The starting system provides torque to accelerate the engine to a speed such that it can light off and continue to run unassisted.
The starting system is located underneath the right hand side engine cowlings, and consists of :
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One Starter Air Valve (SAV).
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Two air ducts.
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One pneumatic starter.
EFG
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CTC-201-160-01
EFFECTIVITY
80-00-00 Page 9
ALL CFM56-5B ENGINES FOR A319-A320-A321
ENGINE SYSTEMS Jan 03
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本文链接地址：TRAINING MANUAL CFM56-5B ENGINE SYSTEMS 培训手册 CFM56-5B 发动机系统(25)
