So it's been documented that the Helio U-5A Twin Courier did in fact exist in small numbers. They were apparently used and/or evaluated by the USAF/CIA/Air America in the 1960s.
The thing is, they've apparently disappeared from the face of the earth. Not surprising, considering they were involved with the CIA, I know...but I remember reading that one was given to the Indian Air Force and the others were sent to the Alaska Department of Interior or something like that. I also found this:
Reply from Helio Corp to inquiry: "Unfortunately, we have very little information on the Twin Courier. All we know is that there were supposedly seven delivered to the CIA. There are no manufacturing records for these aircraft. They left the factory one day and were never seen again by the Helio Aircraft Company. Apparently all records either went with the aircraft or were destroyed. We still have all the engineering drawings, but that is about it." (— Jos Heyman 11/20/01)
Does anyone know anything about what might have happened to these planes?