137.Section 31 provides that the CAA may issue a contravention notice where it reasonably believes that a person has contravened or is contravening a licence condition. It must specify the contravention, explain any action that the CAA may take and specify a representation period of not less than 30 days (which may be extended), except in cases of a repeated contravention where a shorter period for representations may be given. The contravention notice (and any subsequent extension or withdrawal) must be published and a copy sent to appropriate industry representatives.