1. Careless or reckless operation
  2. Compliance with ATC clearances and instructions
  3. Failure to meet requirement for certificate, rating and authorization. Especially medical certificate. Only 72% of pilot accident victims were current and legal for the phase of flight to the accident.
  4. Non-compliance with ATC clearance and instructions.
  5. Failure to get required clearance at tower airport.
  6. Proper registration certificate missing.
  7. Non-airworthy aircraft.
  8. Failure to maintain minimum safe altitudes.