Igor,
Thanks for the details, I know the normal civil 61 is 8 ft/sec (derived from US Navy requirements as the HSS-2). The other numbers 10 and 12 are with some damage, at known points, thus the inspection after you write up the hard landing. I flew off the first 124's with de-ice blades at St. Hubert back in 1974, it was a fun summer, working with a great Canadian pilot, Ross Lennox, who flew for P+W Canada back then. Had a few drinks with the Snowbirds at St. Hubert Officer's Mess, and a big headache the next day!
If you have an accident report or any details on that CH-124 can you share them?
Nick