According to
Accident Database: By Manufacturer/Type > TU-154
There was only
11 air disasters with fatalities between years 1973 -1991. It may be not complete list.
First Prague disaster - not determined the cause, second Beirut - not determined too, it is still mysterious, maybe it was shot down. Nacias Nguema - not determined, Al Bayda - lack of fuel after divert....
According to
? russianplanes.net ? ???? ???????
there was
759 Tu-154 flying in 1991
This list does not have:
SU-AXB (1974, Egypt, training flight, 6 fatalities)
LZ-BTB (1978, Syria, 4 fatalities)
CCCP-85169 (1978, central Russia, 4 fatalities)
YR-TPH (1980, Mauritania, 1 fatality)
CCCP-85413 (1988, Russia, 8 fatalities) - OK, this one was a hijacking so let's drop this one
YR-TPJ (1989, Romania, 5 fatalities)
Good source for production numbers. By 1991 596 Tu-154's were completed, not counting M's and pre-production frames. (I seriously underestimated the degree to which aircraft production went off the cliff after 1991.) Assuming that all of those survived to 1991, I see about 7700 aircraft-years of operations (e.g. 11 aircraft made in 1971 * 20 years from 1971 to 1991 = 220 aircraft-years, etc.) At 700 departures/year, that's 5.4 million departures and 3 losses per million departures.
For M's, it says that more than 80% of Tu-154M were manufactured between 1986 and 1993, so my previous estimate stands. This family only accumulated about 500 aircraft-years by 1991, so the expected number of fatal accidents in this family by 1991 at 3 losses / million departures was only ~1.