FAA type certification was awarded June 11, 1963, and Helio gave the Twin Courier a designation of H-500. Foreseeing military use, the U.S. Air Force assigned the designations U-5A and U-5B to the naturally-aspirated and turbocharged versions, respectively. But despite the certification and preparation, only seven examples would ever be produced. //

The operational history of these seven aircraft is as unique as their appearance. While Helio publicly stated that all Twin Couriers were delivered to the CIA, they would go on to operate in clandestine operations under various entities of the U.S. military and government. Over their operational lives, some would be given USAF markings, while others would wear civilian paint schemes and civilian registration numbers. The N-numbers were registered to entities speculated to be shell companies for the CIA. //

Dr. Joe F. Leeker of the University of Texas, Dallas, has compiled what might be the most comprehensive history of the Twin Courier. In it, he traces the progression of each airframe through its respective history, noting that they saw service in Nepal, Bolivia, Peru, and the U.S. before being transferred to—and disappearing in—India. From there, the trail goes cold, and no Twin Couriers are known to exist today.

We can speculate, however. Given the rugged, remote areas in which the aircraft were known to operate, demanding airstrips and conditions likely claimed more than one aircraft. //

Considering the clever engineering and intriguing history of the Twin Courier, it’s unfortunate none exist today to be admired in person by future generations. Despite being certified by the FAA, it’s unlikely more will ever be built.