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n81jg(at)aol.com
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 Posted: Sun Apr 20, 2008 9:49 am Post subject: Avionics cooling |
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Does anyone know how one can cool the older avionics stacks that have solid aluminum box trays stacked on one another without any cooling ports to connect a fan manifold to? Could you cut side or rear openings and direct cooling air from a ducted fan? Would those modifications require a 337 form or just an A&P sign-off? Is there an STC for this modification? Is it necessary to cool these solid state instruments when the front panels get quite hot to the touch or are they designed to handle these temps? A thermocouple test is underway to determine the case temps under actual flight conditions.
John Greaves
Redding, CA
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