"The reasons cited for conducting trials at vendor-specified locations instead of in India are not convincing enough.
"It is particularly so when viewed against the background of cases like the Eurocopter where technical terms had certified the equipments but the credibility of the trial process was thrown into question later," the CAG said.
The CAG said the defence minister agreed to trials at foreign bases only after an assurance by IAF that the evaluation team was fully competent to carry out the task assigned to it.
"What is the guarantee that fidelity and credibility of these trials will remain above board when they do not take place in the country," the report quoted Antony as having asked in a note on the procurement process after he was initially presented with the said proposal.
The report says the then Air Force chief had written to the then defence secretary in October 2007 stating how trials at vendors' facilities offered many advantages, adding that a delay on account of holding them in India was not advisable.