Both the THY RJ's that ended up in ditches in remote parts of Turkey where badly damaged and would have required major repairs. Both where declared write-offs because it was considered to dangerous and difficult to repair at the site. The cost of temporary repairs and ferry flights pushed the cost of repair higher and became uneconomic. The damage caused was very similar to the TQF 146 that hit a wall in the Sottish Islands but UK tax payers footed the bill for that and Charlie, who was flying it, spent several weeks in the sim at Woodford being re-trained.
The HS681 was a four engined STOL freighter similar in looks to the 146 but much larger with a rear loading ramp. The 146 STA ( the only 146-100QT built) actually served with the Austrian Air Force for a while, it's with National Jet in Australia now.