B737Theory - RAM AIR DUCT doors. The RAM AIR DUCT system supplies and controls cooling air to the air-to-air heat exchangers of the air condition packs. As the word describes it uses
Fahad Naim - (B787)✓The ground cooling valve lets air go through the ram air circuit and across the heat exchanger. - This air cools the nitrogen generation system (NGS) air when the
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