The International Space Station experience brought some further changes. Experience had shown that during docking operations, only two DPO-B were available for abort operations. Thus, on October 23, 2002 a project was formally started to add two additional DPO-B, which brought the total number of high thrust DPO engines to 16. Soyuz TMA-5 was the first spacecraft to fly with this new configuration. With Soyuz TMA-11M debuted a new arrangement of the DPO-B thrusters. But this is a spacecraft specific configuration and does not mean any changes to the KTDU-80 per se.
