New Delhi,30 Apr (Rajya Sabha):A total number of 61 aircraft of Indian Air Force’s (IAF) have crashed during the last five years (financial years 2003-04 to 2007-08).The main reasons behind these crashes were Human Error and Technical Defects. A total number of 30 pilots have lost their lives in the air crashes during the said period. A continuous and multi-faceted effort is always underway in the Indian Air Force to enhance and upgrade flight safety. Measures to enhance the quality of training to improve the skill levels, ability to exercise sound judgment and situational awareness of pilots are being pursued. Constant interaction with Original Equipment Manufacturers, both indigenous and foreign, is also maintained to overcome the technical defects of aircraft. Besides, anti-bird hit measures are also undertaken.This information was given by the Defence Minister Shri AK Antony in a written reply to Shri Satyavrat Chaturvedi in Rajya Sabha today.