Who is responsible for ensuring that maintenance documents of an aeroplane are in order prior to flight?

The responsibility for ensuring that maintenance documents of an airplane are in order prior to flight typically falls on several roles:

1. Aircraft Maintenance Engineer (AME): The AME is responsible for the maintenance and repair of aircraft. They are also responsible for ensuring that all maintenance documents are up-to-date and in order.

2. Pilot: The pilot is also responsible for checking that the aircraft's maintenance documents are in order before flight. They must confirm that all necessary maintenance has been performed and documented.

3. Airline Maintenance Operations: The airline's maintenance operations team also plays a role in ensuring maintenance documents are in order. They coordinate maintenance schedules and ensure documentation is completed correctly.

4. Civil Aviation Authority: The local civil aviation authority also has a role in ensuring maintenance documents are in order. They set the regulations and standards that must be followed and can conduct audits to ensure compliance.

5. Aircraft Owner/Operator: Finally, the aircraft owner or operator is ultimately responsible for the condition of the aircraft, which includes ensuring maintenance documents are in order.

It's important to note that the specific roles and responsibilities can vary depending on the regulations in different countries and the policies of different airlines.