SAMPLE: ------- Topic: 10.1, Regulatory Framework. Question Number 1. A register of airlines operating on an AOC is maintained by the. Option A. ICAO. Option B. CAA. Option C. FAA. Correct Answer is. CAA. Question Number 2. What category of aircraft are 'break-in' markings required?. Option A. All public transport aircraft above 2300Kg. Option B. All public transport aircraft above 5700Kg. Option C. All aircraft registered in the UK. Correct Answer is. All aircraft registered in the UK. Question Number 3. A Part-1 4 5 approval covers. Option A. base maintenance. Option B. the major part of the organisation. Option C. only line maintenance. Correct Answer is. base maintenance. Explanation. The part-1 4 5 organisation covers ALL of the organisation, and not only line maintenance.