[Milsurplus] Collins Avionics Cooling & Connectors

[Bruce Gentry]

The rack these units go into has a suction plenum under the units. Cool 
air comes in the front or top  and leaves at the bottom of each unit in 
the rack. The airflow ratings are for demanding, high altitude service, 
not amateur use at ground level.   Some forced airflow is needed, so be 
sensible but don't panic over exact figures.   ARINC connectors are 
available, but extremely expensive.  All I have ever seen use crimped on 
connections, so you have to hope the pins you need are installed and the 
wiring is long enough to connect to or reach where  you want it.  
Otherwise, you will have to find new pins and the tools to insert and 
remove them.  There are aircraft scrappers, but all I have contacted are 
not friendly to hams. One of them was happy to sell me a "slice" of an 
old Boeing 727 containing the radio racks and wiring  for three thousand 
dollars plus shipping.  A  nose and cockpit   costs  far more, and 
simulator enthusiasts are happy to pay it.

      Bruce 

J. Forster wrote:
> Hi,
>
> Recently I got a Collins 426T-1 Static Inverter. It takes in 28 VDC and
> puts out 115 V 400 Hz, which I plan to use to power an APN-9A.
>
> Anyway, the unit is in a 3/8 ATR short case and requires 15 cfm cooling air.
>
> Does anyone have a drawing or manual excerpt that shows how the cooling
> for such units is organized? I suspect it's built into the ATR rack, but I
> know nothing about them.
>
> Also, does anyone have a source for the 8 pin female ARINC connectors that
> would normally be mounted in the rack?
>
> Thanks,
>
> -John
>
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