Is it necessary to register in Spain a two-seat motorised trike of about 100 kg?

All aircraft must comply with the obligations laid down in Law 48/1960 on Air Navigation. Article 151 provides for the following derogation: Aircraft with limited uses, technical characteristics and actions may be exempted, under the conditions laid down by regulation, from the requirements for entry in the Register of Aircraft and obtaining the certificate of airworthiness referred to in Articles 29 and 36 of this Law respectively. Royal Decree 384/2015 of 22 May 2015 approving the Regulation on the registration of civil aircraft implements this derogation for, among other types of aircraft: The following are exempt from the requirement of registration in the Aircraft Registration Register:

1.- Paragliders: Non-rigid support structures are considered paragliders, for which take-off and landing requires only the physical effort of their occupants.

2.- Motorised paragliders: Paragliders that have an auxiliary propulsion system, either supported by an occupant or by an auxiliary structure, are considered to be motorised paragliders or for engines.

3.- Other aircraft requiring physical effort for take-off or landing, even if equipped with an auxiliary propulsion system to facilitate take-off.

4.- Other aircraft whose total take-off weight, minus the pilot’s weight, is less than 70 kilograms. Therefore, foot launch paramotors and mini-trikes of less than 70 kg (empty weight + fuel) are explicitly excluded from registration. For heavier trikes, it would be necessary to consider whether paragraph 2.- can be applied, on the basis that the bearing surface is not rigid, requiring, in part, the pilot’s effort to acquire at take-off (and keep in flight) its form.