1. 8503-1. Which of the following are sometimes used as authorization to deviate from an aircraft’s original type design? 1. FAA Form 337. 2. Supplemental Type Certificate. 3. Airworthiness Directive. 4. Technical Standard Order. A. 1, 2, 3, and 4 B. 1, 2, and 4 C. 1, 2, and 3.