"We have been trying to improve the serviceability of Sukhois. It has improved by seven percent in last 8-9 months to reach to 56-57 per cent," he added in Rajya Sabha, exuding hope that it would go up to 75 per cent by the year end.

A total of 35 incidents of engine failures in air or other engine-related problems have occured between January, 2013 and December 2014.

To a question, Parrikar said the Russian OriginalEquipment Manufacturer had introduced a number of measures to contain and eliminate technical issues that have led to engine troubles in flight.

Parrikar explained the Indian Air Force has also finalised long-term repair agreements with Russian OEMs to improve availability of aircraft for operational use.

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