Were established virtually everywhere to cope with growing demand boosted by limited TBOs and intensive use. After the end of the USSR, the money drained out from the sector, the intensity of operations plummeted and most factories went out of business. The ensued natural selection has produced a few reliable facilities, leaving aside some half-dead, half-survivors to avoid. We have made our selection.

2) All the components go to separate shops for overhaul and testing. All non-conform elements including those with TBO run out, are replaced. Replacement of the fabrics, rubber elements including hoses, gaskets, bushings, tires. Fitting of all lacking service bulletin modifications. No element is put back unchecked or unrepaired;

3) The engine overhaul and testing, new segments, hot and rubber parts, fitting of all lacking service bulletins. Engine mandatory test runs on a special stand;

4) Reassembly of all repaired and new parts, to produce a virtually new plane. Updating of the logbooks following the strict rule: "All what is done is written, all what is written, is done";

5) The severe "OTK", internal control. This makes difference. They are very meticulous no-nonsense people, keen on respescting the designer's specs and customer's interests, awed by factory managers. Their "no" is a NO;

6)Factory roll-out, final checks and flight tests.