[Milsurplus] Collins Avionics Cooling & Connectors

[Francesco Ledda]

I operated the 426T-1 on a bench to power a 618T-3, and the cooling fan was
not necessary. When the 618T-3 and the 426T-1 are inside an MRC-108 coffin,
the fan is a must!

The connector is very unusual; Paul Keys at Columbia Electronics had some
MRC-108 coffins, years ago. I may be interested in selling some of those
connectors. A new one is about $300, if you can find it............. 

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Bruce Gentry
Sent: Saturday, June 23, 2012 8:53 PM
To: Milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Collins Avionics Cooling & Connectors

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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