This Week in History: April 5 – April 11 Published April 15, 2009 By John Murphy 436th AW historian DOVER AIR FORCE BASE, Del. -- 6 April 1927: The Federal Department of Commerce, Aeronautics Branch, began issuing regulations governing the sale of new aircraft. This became known as the "Approved Type Certificate." The seller presented this certificate which symbolized the airworthiness of the aircraft. The first certificate was given to the Buhl Aircraft Company of Marysville, Mich. The first aircraft purchased under these new regulations was the "Airster" bi-plane bought by Henry B. DuPont. 6 April 1967: A C-141 Starlifter aircraft operated by a crew of the 9th Military Airlift Squadron at Dover Air Force Base, flew the first air evacuation flight from Cam Rhan Bay, Vietnam. The plane flew cargo to Cam Rhan Bay where it was then reconfigured for the evacuation flight. The aircrew evacuated 20 patients during the flight from Vietnam to Kadena Air Base, Japan, to Yokota AB, Japan, and then terminating at Andrews AFB, Md. 5 April 1988: C-5 Galaxy aircraft began testing airdrop capabilities at Pope AFB, N.C. The testing checked the aircraft's airdrop capability in normal, formation, and low-level operations flown by other Military Airlift Command airframes. Four Dover-based aircrews performed these test flights until September of the same year.