1. 8509. (1) Manufacturer’s data and FAA publications such as Airworthiness Directives, Type Certificate Data Sheets, and advisory circulars are all approved data. (2) FAA publications such as Technical Standard Orders, Airworthiness Directives, Type Certificate Data Sheets, and Aircraft Specifications and Supplemental Type Cer tificates are all approved data. Regarding the above statements, A. both No. 1 and No. 2 are true. B. only No. 1 is true C. only No. 2 is true.