[MRCA] ARC-38 chopper issues

[D. Platt]

Gentlemen,  I may be able to assist.  I have a few 400Hz choppers that 
are marked as follows:

Hughes 992200-1, 400cps, AIRPAX 300

There's a schematic on the top and it has one coil (pins 3 and 4), Pins 
1 and 6 are the NO contacts and Pin 7 is the chopper "lever". Looks like 
Pins 2 and 5 are ground (case?)

A few are perhaps 1/4" taller than others and the AIRPAX No. is C-747.  
Hughes p/n is the same and is marked 400 CPS.  Same diagram.  Finally, 
one say Collins p/n 354-1021-009

Any help?

Jeep/K3HVG