Special CBI Judge Ajay Kumar Jain, which had earlier fixed today for consideration of the CBI's plea, deferred the hearing after CBI's prosecutor sought some time to go through the files.
"At his (prosecutor) request, put up the pending application for issuance of letter rogatory for consideration for October 7," the court said.
The court had on September 24 issued an open non-bailable warrant against British national Christian Michel James, an accused in the case, after CBI said he was required for questioning to ascertain crucial aspects in the matter.
CBI, in its FIR, has booked all the accused under the provisions of IPC relating to cheating and criminal conspiracy and under the provisions of the Prevention of Corruption Act.
In its FIR, CBI has alleged that during his tenure as the Air Chief, Tyagi and "with his approval", the Air Force had "conceded to reduce the service ceiling for VVIP helicopters from 6000 metres to 4500 metres as mandatory", which it was opposing vehemently on the grounds of security constraints and other related reasons.