Don't know a hell of a lot about Russian enlisted men except that
until they develop career NCOs no two-year enlistee/draftee is going
to become much of an expert on any sphere of maintenance (roads &
grounds?). That leaves officers and warrant officers as the career
technicians.
As for airliner engines - they run 'on-condition' with a very clsoe
watch on operating parameters. I used to keep tabs on CF6s and RB211s
and the crew entered steady-state operating parameters for each
flight. This was hand-massaged with a special whiz-wheel to normalize
the readings to STP and then graphed. The trend graphs plus oil
spectrometric analysis afforded a pretty good assurance that an
adverse trend would allow detect of trouble well before it got
serious. Nowadays all this is recorded and fed into computers which
avoids a lot of hand work. BTW 15,000 hours in continuous service on
the airframe is not a record for RB 211s. One reason is that they are
babied and operated at something like 80% of maximum rated thrust. For
instance, where I worked the engines were idled 5 minutes after start
to normalize temps before adding power. And also idled 5 minutes prior
to shutdown, also to normalize the temperatures. It paid off big-time.
Walt BJ