6) Modification of a Homologated Safety Cage / Safety Rollbar
It is possible to perform modifications to a Schedule A ‘homologated’ or Schedule AA ‘approved’ safety
cage or safety rollbar under the following conditions;
• All proposed modifications should be presented to the MSNZ Technical Department for approval
prior to any work commencing.
• Once the proposed modification has been completed an Extension Application Form (Form
T004) shall be completed and submitted to the MSNZ Technical Department for acceptance and
update (re-validation) of the existing homologation.
• An Extension Application is only valid where tube members are added that are not part of the
principal structure. This will include; side intrusion bars, harness mounting bars, reinforcements,
and gussets.
• The existing homologation number will be retained.
• An Extension Application can not be used where any tube members are introduced that form
part of the principle structure. In this case a new application will be required. (As an example;
the addition of two lateral rollbars and a connecting member to a Safety Rollbar will require a
new application. A new homologation number will be issued).
• Any permanent modification to a homologated structure will invalidate the original certification
hence an extension certificate must be issued to re-validate the homologation / approval before
the vehicle can be used in competition.