1. The aircraft operator shall monitor the data mentioned in Annex IIIa, Section 4.

2. The data monitored as referred to in paragraph 1 shall be sourced by the aircraft operator, including from flight data recorder equipment of the aircraft, where available.

3. By way of derogation from paragraph 2, the aircraft operator can choose to rely for the monitoring of some or all of the data, on the following:

(a) independent third-party sources such as Eurocontrol;

(b) NEATS, as described in Annex IIIa, Section 2.

4. Where data is missing and the aircraft operator has demonstrated that it is not capable of retrieving that data via NEATS or other methods, the aircraft operator shall use default values as provided in Annex IIIa, Section 5 and Annex IIIb.

5. The aircraft operators shall provide the verifier with access to all data that is necessary for the verification, including confidential data. Upon request of the aircraft operator the competent authority shall treat information provided by the aircraft operator as confidential.