PPRuNe Forums - View Single Post - 747-400 EICAS maintenance page - Aircon system
Old 11th Nov 2009, 00:56
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SMOC
 
Join Date: Jul 2000
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Checked the MEL and as McBolt says:

I suspect the indication of the locked out "trim air valve" will be blank as the electrical connector is removed to manually position the valve
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