Portable trailer in use in blind landings. Washington D.C. This portable trailer where all the equipment is enclosed can be easily transported to any position on the Airdrome so that the pilot can approach the field into the wind for his landing. All the beam control is dispatched from this trailer to the instrument in the cockpit of the plane while at the same time the pilot is in contact with the airport control tower. Photo shows the plane in a test taking off over the trailer in a test at the Airdrome