Accidents
Aircraft accidents are grouped in three categories (Cat-I, Cat-II and Cat-III) and cover all damages of more than 10 per cent of the total cost of the aircraft as shown below:-
Cat-I- These are serious accidents in which aircraft is destroyed or damaged beyond economical repair (BER) or cost of damage of the aircraft, excluding damage to aero-engine(s) is more than 50 per cent of the total cost of the aircraft.
Cat-II-Aircraft sustains extensive damage and the cost of damage/repair, excluding damage to aero-engine(s), is 31 per cent to 50 per cent of the total cost of the aircraft.
Cat-III- Aircraft sustains major damage and the cost of damage/repair, excluding damage to the aero-engine(s), is 11 per cent to 30 per cent of the total cost of the aircraft.
Incidents
Minor damages to the aircraft where the cost of damage is upto 10 percent are categorized as Incidents as shown below:-
Cat IV- Minor damage to the aircraft (airframe) where the cost of damage is up to 10 per cent of the total cost of the aircraft.
Cat V- All flying/ground Incidents, considered worth reporting in the interest of aerospace safety