How many 234 Chinooks were there? Six. Not quite the same. And what happened to British Airways Helicopters in the North Sea is probably as relevant as what happened to the Chinook.
What if there had been accidents as a results of transmission failure in the workhorse type of the time?
S-61: NM in 1970, QA in 1973 (4 fatal), HN in 1977 (rotorhead), SZ in 1977 (rotorhead)(12 fatal), QS in 1978 (18 fatal), NL in 1983 and ID in 1988.