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Thread: 747-400 EICAS maintenance page - Aircon system
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Old 11th November 2009 | 00:56
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SMOC
 
Joined: Jul 2000
Posts: 1,424
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From: Smogsville
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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