This private Short Takeoff & Landing (STOL) runwaywas evidently built at some point between 1963-67, as nothing but woods was depicted at the site on a 1963 aerial photo.
Air Ports, Transportation - Aviation
The earliest depiction of the airfield which has been located was a 1967 aerial photo by Chris Kennedy.
It depicted the STOL runway in between the Fairchild plant & Route 270.
The short runway was built adjacent to the Germantown plant of the Fairchild Defense Company.
The runway consisted of a mere 600' long asphalt strip, located in between the Fairchild office buildings & Route 270.
According to Chris Kennedy, Fairchild was license-building the Pilatus Turbo Porter in the 1960s, and they used to land one at the Germantown STOL runway occasionally.
A total of 92 Porters were built by Fairchild, which had an aircraft factory nearby in Hagerstown, MD.