Unless we have been advised otherwise, the figure that appears on the estimate, and the one that is used in the calculation to determine the minimum insurance requirements is the design maximum for the aircraft type. If you wish to notify us of the declared maximum number of passengers that the aircraft is going to carry please contact the Aircraft Registration section in writing or by email. Please note that it is not mandatory to advise the CAA of the lower declared maximum number of passengers carried unless requested to do so by the CAA, if your aircraft is going through a change of registered ownership or if your aircraft is joining the Register.