(b) Substantial Involvement. The applicant must demonstrate substantial involvement sufficient to show special knowledge, skills, and proficiency in the practice of aviation law during the 3 years immediately preceding the application date. Substantial involvement is devoting at least 30 percent of one's practice to matters in which issues of aviation law are significant factors and in which the applicant had substantial and direct participation in those aviation issues. On the applicant's request and the recommendation of the aviation law certification committee, the board of legal specialization and education may waive the requirement that the 3 years be "immediately preceding" the application date for good cause shown. The applicant must furnish information concerning the frequency of the applicant's work and the nature of the issues involved. Time devoted to lecturing or authoring books or articles on fields of aviation law substitutes for the practice of law if the applicant was engaged in the practice of law during that time period.
Demonstration of compliance with this requirement shall be made initially in the form of a questionnaire approved by the aviation law certification committee, but written or oral supplementation may be required.