CBI sources said Natarajan was asked to appear only to clarify some points as he is not an accused in the case. Natarajan arrived at the CBI headquarters here at about 11.30 AM.
Natarajan may also be asked details of payments made to Tatra Sipox UK and procurement process of equipment used in assembling these trucks, they said.
In 1997, Tatra Sipox UK had signed the truck supply deal with BEML which was in alleged violation of defence procurement rules stating that procurement should be done directly from original equipment manufacturer only, the sources said. The CBI has alleged that since Tatra Sipox UK was not the original manufacturer of these all-terrain trucks, the rule that defence procurements should be made from original manufacturer was violated.