Over 30 of crashes attributed to technical defects unresolved, remedial steps put in place. The Indian Air Force does not know what is causing a bulk of its aircraft to crash, inhibiting its ability to put in remedial actions and compromising the safety of its ageing fleet and pilots. A detailed study on flight crash records of the air force has found that over 40 crashes that are attributed to technical defect remain unresolved due to the lack of advanced air crash investigation technology, having an impact on flight safety.