There are 5 Tandem Rotor CH47D aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1990 and 1993.
N950CH
1993 Tandem Rotor LLC CH47D
Howell, MI
N952CH
1992 Tandem Rotor LLC CH47D
Howell, MI
N947CH
1990 Tandem Rotor LLC CH47D
Missoula, MT
N948CH
1990 Tandem Rotor LLC CH47D
Missoula, MT
N949CH
1990 Tandem Rotor LLC CH47D
Missoula, MT