We used to put the chips on "Scotch Tape" and put them in the log book.
We had the 250 course and were qualified to check chip plugs and change oil and filters...sometimes the nearest engineer was 500 -700 miles away.
We did a lot of phone calls or talking on the HF Radio.
In those daze if you landed someplace where there was another helicopter, even if it was not from your company the engineers would offer good advice.
In any case we had the phone number of the 250 tech rep to call if need be.
Olden daze but it worked then ...now not so much.