I found out long ago the risks involved in using uncontrolled material. I was a flight engineer on a military ac at the time. Anyone who thinks a little airmanship to get the ac home is a good Idea should think hard about the consequences of it not working as described due to the 50 SBs implemented since the unofficial guide was written. For me, Airmanship is not the right word here. Foolhardyship is more appropriate.