IAF has raised its 45 Squadron at Bangalore for allowing its pilots to fly the aircraft and was supposed to induct the first Tejas Light Combat Aircraft (LCA) in March this year.
But the schedule has now been shifted to coming September, sources said here.
The delay is also understood to have pushed backed the Final Operational Clearance (FOC) of the aircraft from December this year to March 2015.
The aircraft received its Initial Operational Clearance (IOC) last year on December 20 after which Hindustan Aeronautics Ltd (HAL) was supposed to supply two Limited Series Production LCA's to IAF, sources said.
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The LCA programme, cleared in August 1983 at a cost of Rs 560 crore to replace the ageing MiG-21s in IAF's combat fleet, has missed several deadlines.
Asked about the delays, a HAL spokesperson said that as far as the production of LCAs was concerned, "HAL is on the right path and there is no delivery issue at this stage."
"The new initiative will help enhance the rate of production and reduce production cycle-times by incorporating several advanced defence aerospace technologies," the spokesperson said.