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Hello Hercules APU & GTC Expertise

When GTC is in  starter cranking cycle (<35% RPM) Bleed & off load control valve  is remain energized  but APU  (GTC 85-180L/LE)  The valve is remain De-energized  through out starting cycle till  APU  On speed relay is energized and the bleed control SW   is mounted on APU control panel ,placed to open position. What is reason behind it.

Munir Abbasi

Home of Hercules Pakistan

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