[GreenKeys] Documentation needed for LBXD

[John W9DDD]

Good evening all,
I have a LBXD4  TD on a LBXB1 base. I can find a WD for a Bell 28F that seems to match the LBXD4.  I have not been able to find anything for the LBXB1 base.  

A number of things point to this combo having been used in the FAA ADIS system. So I suspect the needed information is in 268B.  Most likely in volume II.  

Google (aka DuckDuckGo) or books.google.com so far have produced no results. 

So any ideas of where else to look would be appreciated. 

John, W9DDD