Here is a report on the IRAN-140 from September 2000. It isn't in service yet, and it also hasn't made it's maiden flight.
The Iranian authorities have reported that the first IRAN-140, the An-140 built under licence by the Iranians, has been completed.
The rollout of the aircraft at Iran Aircraft Manufacturing Industries Company in Esfahan , was the result of an agreement originally signed by the Iranians in 1996 to produce the aircraft initially from kits and move onto local manufacture . The contract for the initial 80 aircraft for military and civil use was signed in 1998. The first customers for the aircraft are likely to be Iran Air, Iran Asseman Airlines and the Iranian Navy and Air Force. The Iranian aircraft was previously reported to have been powered by an up rated TV3-117MA-SBMI for hot high operation.
According to Minister of Transport Ali Hojjati, the aircraft will fly at the end of March 2001 and has been produced not only to meet Russian standards, but also FAR and JAA. The second aircraft is due to be completed by the end of the year and earlier reports have suggested that the Iranian's will produce 12 aircraft a year under the licence. There are however, conflicting reports from the Iranian Defence Minister Ali Shamkhani, suggesting that the aircraft could be in-service as early as February of 2001.
The sales of the aircraft in the Ukriane are reported to have recently recieved a boost from reports of an agreement for Antonov to provide up to five aircraft under a wet lease for Ukrianian carrier Aerosvit to provide feeder services . According to Antonov, the reportedly hourly deal, will allow better evaluation of the aircraft in service.
Yak-42 : Original model from 1980
Yak-42A : Higher range and updated configuration. Only ever announced as a "possibility" (1997 I think)
Yak-42D : Increased fuel capacity and changed configuration. It is the D model which re-entered production in 1985 after intial problems with the Yak-42's tail section.
Yak-42E-LL : Engine test-bed, demonstrated at the 1991 Paris Air Show.
Yak-42F : Aerial photography variant
Yak-42M : A variant of the Yak-42D, which I think was going to use Perm engines. No further plans for this aircraft....yet.
Yak-46 : RIX...I take it you read Russian. There is a great page on the Yak-46 at http://aviahistory.newmail.ru/book/jakovlev/htm/jak46.htm
. Basically, the Yak-46 was to be a two engined variant (picture at the bottom of this post). It was on the drawing boards, and the first flight was expected in 1995, but with most things in Russian aviation, after the break-up of the Soviet Union, plans were cancelled. Also called the Yak-242
Yah-142 : Example with western engines which has never entered production
Yak-242 : see Yak-46