SEOUL — Korea Aerospace Industries will deliver 16 T-50 Golden Eagle supersonic trainers to Indonesia in 2013 under a $400 million contract.

The deal further deepens defense technology ties between the two countries.

It is a breakthrough for Korea Aerospace, whose previous attempts at exporting the T-50 have all failed. In this case, it prevailed over two other shortlisted candidates, the Yakovlev Yak-130 and the Czech Aero L-159B.

Korea Aerospace will build the 16 aircraft and fly them in South Korea before dissembling them for shipping to Indonesia, where they will be reassembled and put through their final acceptance trials, an industry official says.

Although not announced as such, the version to be built for Indonesia is evidently the TA-50, which can be used as an attack aircraft. The official says the aircraft will have a gun and weapons pylons, features of the TA-50.

Korea Aerospace developed the T-50 series with considerable help from Lockheed Martin. Its platform is based on Lockheed Martin’s F-16, which Indonesia operates. Indonesia’s T-50s will replace BAE Systems Hawk Mk. 53 trainers.

Among other cooperative arms projects, Indonesia and South Korea signed a memorandum of understanding in July to collaborate in developing the latter’s proposed KF-X fighter. South Korea also will help produce Indonesia’s Anoa armored personnel carrier.