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Thread: B738 Engine QRH
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Old 7th February 2011 | 16:55
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Right Way Up
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RAT 5,

I have not flown the NG for quite a few years, but perhaps can suggest an answer based on the A320. I think it may be to allow Wing anti icing to be used. The clue for me is the pack being switched off. (precooler performance?) Apologies if i've got the wrong end of the stick.
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