PRF 31032, which is the spec intended to replace MIL P 55110 has the same
requirements in it for etchback, which are .0002 - .003" when specified by the
master drawing.  If no etchback is specified, than a negative etchback of
.0005 is allowable.

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Date: 4/15/96 10:23 AM
To: LISA GREENLEAF
From: Lyle Andersen
Can anyone inform me of the current status of the military requirement re: 
etchback?  A potential customer's blueprint references 55110D and 
specifically calls out for etchback on type 3 boards (multilayer). However, 
the board will have a commercial application and,  as is common with 
blueprint notes, this may be of the "boilerplate" variety.  They may be 
satisfied with desmear with a little education and persuasion.  Thanks to 
any who respond.

Lyle Anderson
Electrostar-Utah Division (formerly Lundahl Astro Circuits
Phone 801-753-4700 ext. 3040