Article 11 7.

When undertaking an investigation into the justification for the modification of the system or the level of airport charges as set out in Article 6, the independent supervisory authority shall have access to necessary information from the parties concerned and shall be required to consult the parties concerned in order to reach its decision. Without prejudice to Article 6(4), it shall issue a final decision as soon as possible, and in any case within four months of the matter being brought before it. This period may be extended by two months in exceptional and duly justified cases. The decisions of the independent supervisory authority shall have binding effect, without prejudice to parliamentary or judicial review, as applicable in the Member States.